CN110423097B

CN110423097B - Method for rapidly preparing building block without furnace at normal temperature

Info

Publication number: CN110423097B
Application number: CN201910841474.1A
Authority: CN
Inventors: 李焕勇; 黄欢欢; 张春辉; 王乾; 罗发
Original assignee: Northwestern Polytechnical University
Current assignee: Shaanxi Zhihangyu Armor New Materials Co.,Ltd.
Priority date: 2019-09-06
Filing date: 2019-09-06
Publication date: 2021-12-28
Anticipated expiration: 2039-09-06
Also published as: CN110423097A

Abstract

The invention relates to a method for rapidly preparing building blocks at normal temperature without a furnace, wherein when the building blocks or sintered bricks are prepared by sintering, one or more water-soluble metal salt solutions are injected into a raw material of green brick powder, at normal temperature, a high-temperature sintering kiln is not needed, pug is not needed to be dried, green bricks are not needed to be heated in advance, alternating current or direct current thermal effect can be directly and rapidly prepared into the building blocks or the sintered bricks at normal temperature, and meanwhile, the method has the characteristics of wide available raw material components, simple brick making process, short sintering time, high efficiency, small hardware investment, high energy utilization rate, wide application range and good energy-saving effect. Is suitable for large-scale preparation of building blocks or sintered bricks, and has wide application prospect.

Description

Method for rapidly preparing building block without furnace at normal temperature

Technical Field

The invention belongs to the technical field of building materials, relates to a method for rapidly preparing building blocks without a furnace, and particularly relates to a method for preparing various building blocks at normal temperature without a heating furnace by directly and rapidly sintering and molding through a current thermal effect.

Background

The small building blocks prepared by sintering in the building materials are commonly called as sintered bricks or bricks (also including tiles), are generally prepared by taking clay, shale, coal gangue, fly ash, sludge (river and lake sludge) and the like as main raw materials through pug treatment, forming, drying and high-temperature roasting, and are mainly used for building sintered building blocks or sintered bricks of load-bearing and non-load-bearing walls. The sintered bricks can be divided into sintered common bricks, sintered porous bricks and sintered hollow bricks according to the porosity of the sintered products; according to different raw materials, the brick is divided into a sintered clay brick, a sintered fly ash brick, a sintered shale brick and the like. The chemical composition of the raw materials used for the common sintered building blocks or sintered bricks is mainly SiO₂、Al₂O₃、CaO、MgO、Fe₂O₃And crystal water, etc., and may also contain small amounts of other alkali metal oxides, alkaline earth metal oxides, and other metal oxides or nonmetalsOxides and the like.

High-temperature roasting is an indispensable process in the preparation of the baked bricks, the process needs to consume a large amount of energy, all the baked bricks at present need to be placed in a sintering kiln for high-temperature roasting or sintering after being molded and dried in the preparation process, and various technical defects of large hardware investment, complex process, long drying time, long sintering time, high energy consumption, low energy utilization rate and the like exist.

Disclosure of Invention

Technical problem to be solved

In order to avoid the defects of the prior art, the invention provides a method for rapidly preparing building blocks at normal temperature without a furnace, which is a technology for preparing various sintered bricks by directly and rapidly sintering at normal temperature by adopting current thermal effect without heating a furnace at high temperature and drying pug, and solves the defects of the prior sintered building blocks or sintered bricks in the preparation technology.

Technical scheme

A method for rapidly preparing building blocks without a furnace is characterized in that: the raw materials of the green brick powder are two or more of clay powder, diatomite powder, sandstone powder, shale powder, coal gangue powder, fly ash or sludge powder; or the chemical component in the raw material or pug of the building block contains SiO₂、Al₂O₃CaO, MgO or Fe₂O₃One or more of oxides; or simultaneously contains crystal water or adsorbed water; or the raw materials simultaneously contain one or more of the following components: 1. crystal water or adsorbed water; 2. alkali metal oxides or alkaline earth metal oxides or other transition metal oxides or rare earth metal oxides; 3. non-oxide or metal oxide double salts; the method for making the building block comprises the following steps:

step 1, weighing raw material of green brick powder: mixing the raw material powder according to the proportion of a common green brick or any proportion to obtain a green brick powder raw material, and weighing the green brick powder raw material;

step 2, preparing a water-soluble metal salt solution: at the temperature of 4-60 ℃, one or more water-soluble metal salts are respectively and independently dissolved in water, hydrochloric acid or nitric acid is added to the salt which is hydrolyzed to generate precipitation to adjust the pH value until the solution is clear, and one or more water-soluble metal salt saturated water solutions are respectively prepared;

step 2: respectively injecting the prepared one or more water-soluble metal salt saturated solutions into green brick powder raw materials, adding water to stir the green brick powder to be uniform, aging for 0.5-24 hours, and then airing the green brick powder raw materials at 10-100 ℃ until the water content is 5-25% to prepare pug; putting the prepared wet pug into a mold, and applying pressure of 1-50 MPa to form the pug into a wet green brick;

the total weight of the water-soluble metal salt accounts for 1-30 wt% of the weight of the raw material of the green brick powder;

the mass of the water is not higher than 120 wt% of the total mass of the green brick powder raw material;

and step 3: at the temperature of 4-60 ℃, horizontally orienting the maximum surface of the formed wet green brick, placing the green brick between two electrodes connected with a direct current power supply or an alternating current power supply to ensure that the two electrodes are in close contact with the green brick, turning on the power supply, adjusting the working state of the power supply to be in a constant current mode, and adjusting the current to ensure that the current intensity applied to the two ends of the green brick is between 0.5A/cm²～25A/cm²Applying and maintaining the mechanical pressure of 0.1-10 MPa through electrodes, heating and sintering the wet brick blank under current, and electrifying for 0.1-20 min to obtain a sintered brick or a sintered building block with certain density;

the electrode material is made of a metal material with a melting point higher than 1800 ℃, or an alloy material with a melting point higher than 1800 ℃ or a graphite material.

The electrode is a flat plate electrode, wherein tiny circular through holes are uniformly distributed on the flat plate electrode, the diameter of each through hole is 1-5 mm, and the distribution density of the through holes is 0.5-1/cm²。

The grain diameter of the raw material powder is not more than 3.0 mm.

The water is distilled water or tap water.

The water-soluble metal salt is a water-soluble salt of an alkali metal, a water-soluble salt of an alkaline earth metal or various water-soluble salts of transition metal elements.

The above-mentionedWater-soluble salts of alkali metals: including alkali metal halide salts: ACl, a ═ Li, Na, K, Rb, Cs; or alkali metal sulfate: a. the₂SO₄A ═ Li, Na, K, Rb, Cs; or alkali metal nitrates: ANO₃A ═ Li, Na, K, Rb, Cs; or an alkali metal carbonate: a. the₂CO₃A ═ Li, Na, K, Rb, Cs; or alkali metal phosphates: a. the₃PO₄A ═ Li, Na, K, Rb, Cs; or a water-soluble organic acid salt of an alkali metal.

Water-soluble salts of the alkaline earth metals: comprises the following halides: BCl₂B ═ Mg, Ca, Sr, Ba; or an alkaline earth metal nitrate: b (NO)₃)₂，B＝Mg、Ca、Sr、Ba。

Various water-soluble salts of the transition metal elements: comprises water-soluble halide salt, water-soluble sulfate, water-soluble nitrate or water-soluble phosphate of the transition metal elements of aluminum Al, zinc Zn, iron Fe, copper Cu, manganese Mn, nickel Ni, cobalt Co, indium In, tin Sn, antimony Sb, bismuth Bi or zirconium Zr.

Advantageous effects

Compared with the existing sintered brick preparation technology, the method for rapidly preparing the building block without the furnace at the normal temperature can realize that the building block or the sintered brick can be directly and rapidly prepared by the alternating current or direct current thermal effect at the normal temperature without a high-temperature sintering furnace, drying pug, drying green bricks and heating the green bricks in advance when the building block or the sintered brick is prepared by sintering, and has the characteristics of wide available raw material components, simple brick making process, short sintering time, high efficiency, small hardware investment, high energy utilization rate, wide application range and good energy-saving effect. Is suitable for large-scale preparation of building blocks or sintered bricks, and has wide application prospect.

Detailed Description

The invention will now be further described with reference to the examples:

example 1: method for preparing building block by furnace-free rapid sintering at 10 DEG C

Step 1, weighing raw material of green brick powder: clay powder with the grain diameter of 0.5 mm-3.0 mm, coal gangue powder with the grain diameter of 0.6 mm-3.0 mm and fly ash powder with the grain diameter of 0.1 mm-2.5 mm are mixed according to the weight ratio of 1:1:1, weighing 210 g, 210 g and 210 g respectively, and uniformly mixing to obtain the green brick powder raw material.

Step 2, preparation of saturated sodium chloride solution: weighing 45 g of analytically pure sodium chloride powder, adding sodium chloride into 125mL of distilled water at 10 ℃, and uniformly stirring by using a magnetic stirrer until the solution is clear to prepare a saturated solution of sodium chloride at 10 ℃;

step 3, modulation and molding of green brick pug: and (3) completely injecting the saturated sodium chloride solution prepared in the step (2) into the green brick powder raw material, adding 300mL of tap water, stirring the green brick slurry to be uniform, aging for 24 hours, and airing the green brick slurry raw material at 45 ℃ until the water content is 15% to prepare a pug. The prepared wet pug is put into a die, and pressure of 50MPa is applied to shape the pug and prepare wet green bricks with the size of 120 multiplied by 115 multiplied by 25 mm.

Step 4, alternating current sintering densification of the green brick: horizontally orienting the maximum surface of the blank obtained in the step 3 at 10 ℃, placing the blank between two flat graphite electrodes connected with an alternating current power supply, and enabling the two electrodes to be in close contact with the blank, wherein the area of the electrodes covers the upper surface and the lower surface of the blank, micro round through holes are uniformly distributed on the flat electrode at the upper end, the diameter of the through holes is phi 1mm, and the distribution density of the through holes is 1/cm²And a mechanical pressure of 0.1MPa was applied and maintained by the electrodes. Switching on a power supply, adjusting the working state of the power supply to be in a constant current mode, and adjusting the current to ensure that the current intensity applied to the two ends of the blank is 12A/cm²And (3) heating and sintering the green brick under current, and electrifying for 1.1min to obtain the building block with the density of 88%.

Example 2: method for preparing building block by furnace-free rapid sintering at 25 DEG C

Step 1, weighing raw material of green brick powder: mixing clay powder with the particle size of 0.5-3 mm, diatomite powder with the particle size of 0.5-1.0 mm and fly ash powder with the particle size of 0.05-0.8 mm according to the weight ratio of 1:1: 215 g, 215 g and 215 g are respectively taken according to the proportion of 1, and the raw materials of the green brick powder are obtained by uniformly mixing.

Step 2, preparation of saturated solution of sodium sulfate: weighing 25 g of analytical pure grade sodium sulfate powder, adding sodium sulfate into 125mL of distilled water at 25 ℃, and uniformly stirring by using a magnetic stirrer until the solution is clear to prepare a saturated solution of sodium sulfate at 25 ℃;

step 3, modulation and molding of green brick pug: and (3) completely injecting the saturated sodium sulfate solution prepared in the step (2) into the green brick powder raw material, adding 300mL of distilled water, stirring the green brick powder uniformly, aging for 12 hours, and airing the green brick powder raw material at 25 ℃ until the water content is 25% to prepare a pug. And putting the prepared wet pug into a die, and applying pressure of 1MPa to form the pug into a wet green brick with the size of 120 multiplied by 42 mm.

Step 4, alternating current sintering densification of the green brick: horizontally orienting the maximum surface of the blank obtained in the step 3 at 25 ℃, placing the blank between two flat graphite electrodes connected with an alternating current power supply, and enabling the two electrodes to be in close contact with the blank, wherein the area of the electrodes covers the upper surface and the lower surface of the blank, micro round through holes are uniformly distributed on the flat electrode at the upper end, the diameter of the through holes is phi 5mm, and the distribution density of the through holes is 1/cm²And a mechanical pressure of 10MPa was applied and maintained by the electrodes. Switching on a power supply, adjusting the working state of the power supply to be in a constant current mode, and adjusting the current to ensure that the current intensity applied to the two ends of the blank is 12.5A/cm²And heating and sintering the green brick under current, and electrifying for 0.9min to obtain the building block with the density of 86.8%.

Example 3: method for preparing building block by furnace-free rapid sintering at 20 DEG C

Step 1, weighing raw material of green brick powder: clay powder with the particle size of 0.08-1.2 mm, shale powder with the particle size of 0.5-1.5 mm and fly ash powder with the particle size of 0.1-1 mm are mixed according to the proportion of 1:1: and 1, respectively taking 85 g, 85 g and 85 g, and uniformly mixing to obtain the green brick powder raw material.

Step 2, preparation of saturated potassium chloride solution: weighing 17 g of analytically pure potassium chloride powder, adding potassium chloride into 100mL of distilled water at 20 ℃, and uniformly stirring by using a magnetic stirrer until the solution is clear to prepare a saturated solution of potassium chloride at 20 ℃;

step 3, modulation and molding of green brick pug: and (3) completely injecting the saturated potassium chloride solution prepared in the step (2) into the green brick powder raw material, adding 100mL of tap water, stirring the green brick powder uniformly, aging for 24 hours, and airing the green brick powder raw material at 60 ℃ until the water content is 11% to prepare a pug. The prepared wet pug is put into a die, and pressure of 30MPa is applied to form the pug into a wet green brick with the size of 60 multiplied by 15 multiplied by 20 mm.

Step 4, direct current sintering densification of the green brick: horizontally orienting the maximum surface of the blank obtained in the step (3) at 20 ℃, then placing the blank between two flat graphite electrodes connected with a direct current power supply, and enabling the positive electrode and the negative electrode to be in close contact with the blank, wherein the area of the electrodes covers the upper surface and the lower surface of the blank, micro round through holes are uniformly distributed on the flat electrode at the upper end, the diameter of the through holes is phi 1mm, and the distribution density of the through holes is 0.5/cm²And a mechanical pressure of 5MPa was applied and maintained by the electrodes. Switching on a power supply, adjusting the working state of the power supply to be in a constant current mode, and adjusting the current to ensure that the current intensity applied to the two ends of the blank is 0.5A/cm²And (3) heating and sintering the green brick under current, and electrifying for 20min to obtain the building block with the density of 82.2%.

Example 4: method for preparing building block by furnace-free rapid sintering at 20 DEG C

Step 1, weighing raw material of green brick powder: mixing shale powder with the particle size of 0.1-1.5 mm, coal gangue powder with the particle size of 0.08-0.8 mm and sludge powder with the particle size of 0.2-3.5 mm according to the weight ratio of 1:1: the raw materials of the green brick powder are obtained by uniformly mixing 840 g, 840 g and 840 g of the raw materials according to the proportion of 1.

Step 2, preparation of saturated solution of sodium nitrate: weighing 219 g of analytical pure-grade sodium nitrate powder, adding sodium nitrate into 250mL of distilled water at 20 ℃, and uniformly stirring by using a magnetic stirrer until the solution is clear to prepare a saturated solution of sodium nitrate at 20 ℃;

step 3, modulation and molding of green brick pug: and (3) completely injecting the saturated sodium nitrate solution prepared in the step (2) into the green brick powder raw material, adding 700mL of tap water, stirring the green brick powder uniformly, aging for 12 hours, and airing the green brick powder raw material at 35 ℃ until the water content is 9% to prepare a pug. The prepared wet pug is put into a mould, and pressure of 50MPa is applied to make the pug shaped to prepare wet green bricks with the size of 240 multiplied by 115 multiplied by 51 mm.

Step 4, direct current sintering densification of the green brick: horizontally orienting the maximum surface of the blank obtained in the step (3) at 20 ℃, then placing the blank between two flat tungsten electrodes connected with a direct current power supply, and enabling the two electrodes to be in close contact with the blank, wherein the area of the electrodes covers the upper surface and the lower surface of the blank, micro round through holes are uniformly distributed on the flat electrode at the upper end, the diameter of the through holes is phi 2mm, and the distribution density of the through holes is 0.5/cm²And a mechanical pressure of 0.1MPa was applied and maintained by the electrodes. Switching on a power supply, adjusting the working state of the power supply to be in a constant current mode, and adjusting the current to ensure that the current intensity applied to the two ends of the blank is 10.14A/cm²And (3) heating and sintering the green brick under current, and electrifying for 1min to obtain the building block with the density of 78.2%.

Example 5: method for preparing building block by furnace-free rapid sintering at 20 DEG C

Step 1, weighing raw material of green brick powder: diatomite powder with the particle size of 0.1-0.8 mm, fly ash powder with the particle size of 0.1-1.5 mm and sludge powder with the particle size of 0.1-2 mm are mixed according to the weight ratio of 1:1: and 1, respectively taking 340 g, 340 g and 340 g, and uniformly mixing to obtain the green brick powder raw material.

Step 2, preparation of a saturated calcium chloride solution: weighing 112.5 g of analytically pure calcium chloride powder, adding calcium chloride into 150mL of distilled water at 20 ℃, and uniformly stirring by using a magnetic stirrer until the solution is clear to prepare a saturated solution of calcium chloride at 20 ℃;

step 3, modulation and molding of green brick pug: and (3) completely injecting the saturated calcium chloride solution prepared in the step (2) into the green brick powder raw material, adding 600mL of distilled water, stirring the green brick powder to be uniform, aging for 10.5 hours, and airing the green brick powder raw material at 100 ℃ until the water content is 19% to prepare a pug. The prepared wet pug is put into a die, and pressure of 30.5MPa is applied to form the pug into a wet green brick with the size of 120 multiplied by 50 mm.

Step 4, direct current sintering densification of the green brick: the maximum of the green body obtained in step 3 is measured at 20 DEG CHorizontally orienting, placing the blank between two flat graphite electrodes connected with DC power supply, and making the two electrodes closely contact with the blank, wherein the electrode area covers the upper and lower surfaces of the blank, small circular through holes are uniformly distributed on the upper flat electrode, the diameter of the through holes is phi 2mm, and the distribution density of the through holes is 0.5/cm²And a mechanical pressure of 5MPa was applied and maintained by the electrodes. Switching on a power supply, adjusting the working state of the power supply to be in a constant current mode, and adjusting the current to ensure that the current intensity applied to the two ends of the blank is 25A/cm²And heating and sintering the green brick under current, and electrifying for 0.5min to obtain the building block with the density of 88.3 percent.

Example 6: method for preparing building block by furnace-free rapid sintering at 20 DEG C

Step 1, weighing raw material of green brick powder: taking 750 grams and 1750 grams of shale powder with the particle size of 0.2-1.5 mm and sludge powder with the particle size of 0.1-2 mm according to the proportion of 3:7 respectively, and uniformly mixing to obtain a raw material of green brick powder.

Step 2, preparing saturated solutions of sodium nitrate and calcium chloride respectively: weighing 262.8 g of analytically pure sodium nitrate powder and 223.5 g of analytically pure calcium chloride powder, adding the weighed sodium nitrate into 300mL of distilled water at the temperature of 20 ℃, and uniformly stirring by using a magnetic stirrer until the solution is clarified to prepare a sodium nitrate saturated solution at the temperature of 20 ℃; the weighed calcium chloride is added into 300mL of distilled water, and the mixture is stirred uniformly by a magnetic stirrer until the solution is clear, so that a saturated solution of the calcium chloride at the temperature of 20 ℃ is prepared.

Step 3, modulation and molding of green brick pug: and (3) respectively and completely injecting the saturated solutions prepared in the step (2) into green brick powder raw materials, adding 400mL of tap water, stirring the green brick powder to be uniform, aging for 10.5 hours, and airing the green brick powder raw materials at 50 ℃ until the water content is 8% to prepare pug. The prepared wet pug is put into a mould, and pressure of 40MPa is applied to make the pug shaped to prepare wet green bricks with the size of 240 multiplied by 115 multiplied by 53 mm.

Step 4, alternating current sintering densification of the green brick: orienting the maximum plane of the blank obtained in step 3 at 20 ℃, then placing the blank between two flat-plate graphites connected with an alternating current power supply, and enabling the blank to be horizontally orientedTwo electrodes are obtained to be in close contact with the blank body, wherein the area of the electrodes covers the upper surface and the lower surface of the blank body, micro round through holes are uniformly distributed on the upper flat plate electrode, the diameter phi of each through hole is 1mm, and the distribution density of the through holes is 0.5/cm²And a mechanical pressure of 10MPa was applied and maintained by the electrodes. Switching on a power supply, adjusting the working state of the power supply to be in a constant current mode, and adjusting the current to ensure that the current intensity applied to the two ends of the blank is 5A/cm²And heating and sintering the green brick under current, and electrifying for 13min to obtain the building block with the density of 87.8 percent.

Example 7: method for preparing building block by furnace-free rapid sintering at 40 DEG C

Step 1, weighing raw material of green brick powder: taking 750 grams and 1750 grams of shale powder with the grain size of 0.1-1.5 mm and sludge powder with the grain size of 0.1-2 mm according to the proportion of 3:7 respectively, and uniformly mixing to obtain a raw material of green brick powder.

Step 2, preparing saturated solutions of ferric nitrate and potassium chloride respectively: weighing 175 g of analytically pure ferric nitrate powder and 40.1 g of analytically pure potassium chloride powder, adding the weighed ferric nitrate powder into 100mL of distilled water at 40 ℃, adding 1.0mol/L hydrochloric acid to adjust the pH value to 3 until the solution is clear, and uniformly stirring by using a magnetic stirrer to prepare a ferric nitrate saturated solution at 40 ℃; the weighed potassium chloride was added to 100mL of distilled water, and stirred uniformly with a magnetic stirrer to prepare a saturated solution of potassium chloride at 40 ℃.

Step 3, modulation and molding of green brick pug: and (3) respectively and completely injecting the saturated solutions prepared in the step (2) into green brick powder raw materials, adding 800mL of tap water, stirring the green brick powder to be uniform, aging for 10.5 hours, and then airing the green brick powder raw materials at 30 ℃ until the water content is 14% to prepare pug. The prepared wet pug is put into a mould, and pressure of 40MPa is applied to make the pug shaped to prepare wet green bricks with the size of 240 multiplied by 115 multiplied by 53 mm.

Step 4, alternating current sintering densification of the green brick: horizontally orienting the maximum surface of the blank obtained in the step (3) at 40 ℃, then placing the blank between two flat graphite electrodes connected with an alternating current power supply, and enabling the two electrodes to be in close contact with the blank, wherein the area of the electrodes covers the upper and lower two of the blankThe upper flat electrode is uniformly distributed with micro round through holes with the diameter phi of 1mm and the distribution density of 1/cm²And a mechanical pressure of 2MPa is applied and maintained by the electrodes. Switching on a power supply, adjusting the working state of the power supply to be in a constant current mode, and adjusting the current to ensure that the current intensity applied to the two ends of the blank is 12.32A/cm²And heating and sintering the green brick under current, and electrifying for 1.4min to obtain the building block with the density of 88.2%.

Example 8: method for preparing building block by furnace-free rapid sintering at 30 DEG C

Step 1, weighing raw material of green brick powder: the method comprises the steps of respectively taking 1500 g, 750 g and 250 g of fly ash powder with the particle size of 0.1-1.1 mm, coal gangue powder with the particle size of 0.8-2.3 mm and clay powder with the particle size of 0.6-1.9 mm according to the ratio of 6:3:1, and uniformly mixing to obtain a green brick powder raw material.

Step 2, preparing saturated solutions of nickel nitrate, zinc chloride and cobalt chloride respectively: weighing 42 g of analytically pure nickel nitrate powder, 174.8 g of analytically pure zinc chloride powder and 23.88 g of analytically pure cobalt chloride powder, adding the weighed nickel nitrate powder into 40mL of distilled water at 30 ℃, adding 1.0mol/L hydrochloric acid to adjust the pH value to 3 until the solution is clarified, and uniformly stirring by using a magnetic stirrer to prepare a nickel nitrate saturated solution at 30 ℃; adding weighed zinc chloride powder into 40mL of distilled water, adding 1.0mol/L hydrochloric acid to adjust the pH value to 3 until the solution is clear, and uniformly stirring by using a magnetic stirrer to prepare a zinc chloride saturated solution at the temperature of 30 ℃; adding weighed cobalt chloride powder into 40mL of distilled water, adding 1.0mol/L hydrochloric acid to adjust the pH value to 3 until the solution is clear, and uniformly stirring by using a magnetic stirrer to prepare a cobalt chloride saturated solution at the temperature of 30 ℃.

Step 3, modulation and molding of green brick pug: and (3) respectively and completely injecting the saturated solutions prepared in the step (2) into green brick powder raw materials, adding 1200mL of tap water, stirring the green brick powder to be uniform, aging for 10.5 hours, and airing the green brick powder raw materials at 50 ℃ until the water content is 10% to prepare pug. The prepared wet pug is put into a mould, and pressure of 40MPa is applied to make the pug shaped to prepare wet green bricks with the size of 240 multiplied by 115 multiplied by 53 mm.

Step 4 alternating current of green brickSintering densification: horizontally orienting the maximum surface of the blank obtained in the step (3) at 30 ℃, then placing the blank between two flat graphite plates connected with an alternating current power supply, and enabling two electrodes to be in close contact with the blank, wherein the area of the electrodes covers the upper surface and the lower surface of the blank, micro round through holes are uniformly distributed on the flat electrode at the upper end, the diameter of the through holes is phi 4mm, and the distribution density of the through holes is 0.5/cm²And a mechanical pressure of 1MPa was applied and maintained by the electrodes. Switching on a power supply, adjusting the working state of the power supply to be in a constant current mode, and adjusting the current to ensure that the current intensity applied to the two ends of the blank is 12.32A/cm²And the green brick is heated and sintered under current, and is electrified for 1.5min to obtain the building block with the density of 84.5 percent.

Example 9: method for preparing building block by furnace-free rapid sintering at 30 DEG C

Step 1, weighing raw material of green brick powder: 500 g, 750 g and 1250 g of fly ash powder with the particle size of 0.1-1.1 mm, coal gangue powder with the particle size of 0.8-2 mm and clay powder with the particle size of 0.6-2.5 mm are respectively taken according to the proportion of 2:3:5 and are uniformly mixed to obtain a raw material of green brick powder.

Step 3, modulation and molding of green brick pug: and (3) respectively and completely injecting the saturated solutions prepared in the step (2) into green brick powder raw materials, adding 880mL of tap water, stirring the green brick powder to be uniform, aging for 11.5 hours, and airing the green brick powder raw materials at 45 ℃ until the water content is 11% to prepare pug. The prepared wet pug is put into a mould, and pressure of 40MPa is applied to make the pug shaped and prepare wet green bricks with the size of 240 multiplied by 115 multiplied by 52 mm.

Step 4, alternating current sintering densification of the green brick: horizontally orienting the maximum surface of the blank obtained in the step 3 at 30 ℃, then placing the blank between two flat molybdenum electrodes connected with an alternating current power supply, and enabling the two electrodes to be in close contact with the blank, wherein the area of the electrodes covers the upper surface and the lower surface of the blank, micro round through holes are uniformly distributed on the flat electrode at the upper end, the diameter of the through holes is phi 1mm, and the distribution density of the through holes is 1/cm²And a mechanical pressure of 8MPa was applied and maintained by the electrodes. Switching on a power supply, adjusting the working state of the power supply to be in a constant current mode, and adjusting the current to ensure that the current intensity applied to the two ends of the blank is 13.04A/cm²And heating and sintering the green brick under current, and electrifying for 72s to obtain the building block with the density of 87.2 percent.

Example 10: method for preparing building block by furnace-free rapid sintering at 40 DEG C

Step 1, weighing raw material of green brick powder: uniformly mixing the fly ash powder with the particle size of 0.7-3 mm and the diatomite powder with the particle size of 0.2-2.3 mm according to the proportion of 9:1, and obtaining a raw brick powder material by taking 2250 g and 250 g respectively.

Step 2, preparing saturated solutions of copper nitrate and manganese chloride respectively: weighing 163 g of analytically pure copper nitrate powder and 88.5 g of analytically pure manganese chloride powder, adding the weighed copper nitrate powder into 100mL of distilled water at 40 ℃, adding 1.0mol/L hydrochloric acid to adjust the pH value to 3 until the solution is clear, and uniformly stirring by using a magnetic stirrer to prepare a copper nitrate saturated solution at 40 ℃; adding weighed manganese chloride powder into 100mL of distilled water, adding 1.0mol/L hydrochloric acid to adjust the pH value to 3 until the solution is clear, and uniformly stirring by using a magnetic stirrer to prepare a manganese chloride saturated solution at the temperature of 40 ℃.

Step 3, modulation and molding of green brick pug: and (3) respectively and completely injecting the saturated solutions prepared in the step (2) into green brick powder raw materials, adding 960mL of tap water, stirring the green brick powder to be uniform, aging for 10.5 hours, and airing the green brick powder raw materials at 40 ℃ until the water content is 20% to prepare pug. The prepared wet pug is put into a mould, and pressure of 40MPa is applied to make the pug shaped to prepare wet green bricks with the size of 240 multiplied by 115 multiplied by 53 mm.

Step 4, alternating current sintering densification of the green brick: horizontally orienting the maximum surface of the blank obtained in the step (3) at 40 ℃, then placing the blank between two flat graphite electrodes connected with an alternating current power supply, and enabling the two electrodes to be in close contact with the blank, wherein the area of the electrodes covers the upper surface and the lower surface of the blank, micro round through holes are uniformly distributed on the flat electrode at the upper end, the diameter of the through holes is phi 1mm, and the distribution density of the through holes is 1/cm²And a mechanical pressure of 10MPa was applied and maintained by the electrodes. Switching on a power supply, adjusting the working state of the power supply to be in a constant current mode, and adjusting the current to ensure that the current intensity applied to the two ends of the blank is 13.41A/cm²And heating and sintering the green brick under current, and electrifying for 76s to obtain the building block with the density of 88.4 percent.

Example 11: method for preparing building block by furnace-free rapid sintering at 40 DEG C

Step 1, weighing raw material of green brick powder: and uniformly mixing 1562.5 g and 937.5 g of fly ash powder with the particle size of 0.7-3 mm and diatomite powder with the particle size of 0.2-3 mm according to the proportion of 5:3 to obtain a raw material of brick blank powder.

Step 3, modulation and molding of green brick pug: and (3) respectively and completely injecting the saturated solutions prepared in the step (2) into green brick powder raw materials, adding 960mL of tap water, stirring the green brick powder to be uniform, aging for 10.5 hours, and airing the green brick powder raw materials at 50 ℃ until the water content is 7% to prepare pug. The prepared wet pug is put into a mould, and pressure of 40MPa is applied to make the pug shaped to prepare wet green bricks with the size of 240 multiplied by 115 multiplied by 53 mm.

Step 4, direct current sintering densification of the green brick: horizontally orienting the maximum surface of the blank obtained in the step (3) at 40 ℃, then placing the blank between two flat zirconium-titanium-molybdenum alloy electrodes connected with a direct-current power supply, and enabling the two electrodes to be in close contact with the blank, wherein the area of the electrodes covers the upper surface and the lower surface of the blank, micro round through holes are uniformly distributed on the flat electrode at the upper end, the diameter phi of each through hole is 1mm, and the distribution density of the through holes is 1/cm²And a mechanical pressure of 7MPa was applied and maintained by the electrodes. Switching on a power supply, adjusting the working state of the power supply to be in a constant current mode, and adjusting the current to ensure that the current intensity applied to the two ends of the blank is 13.22A/cm²And heating and sintering the green brick under current, and electrifying for 72s to obtain the building block with the density of 88.2 percent.

Example 12: method for preparing building block by furnace-free rapid sintering at 40 DEG C

Step 1, weighing raw material of green brick powder: the brick blank powder raw material is obtained by uniformly mixing 1000 g, 1000 g and 1000 g of fly ash powder with the particle size of 0.3-2 mm, diatomite powder with the particle size of 0.2-1.5 mm and diatomite powder with the particle size of 0.1-1.6 mm according to the ratio of 1:1: 1.

Step 2, preparing saturated solutions of aluminum nitrate and calcium chloride respectively: weighing 88.7 g of analytically pure aluminum nitrate powder and 128 g of analytically pure calcium chloride powder, adding the weighed aluminum nitrate powder into 100mL of distilled water at 40 ℃, adding 1.0mol/L hydrochloric acid to adjust the pH value to 3 until the solution is clear, and uniformly stirring by using a magnetic stirrer to prepare an aluminum nitrate saturated solution at 40 ℃; the weighed calcium chloride powder is added into 100mL of distilled water, and is stirred uniformly by a magnetic stirrer to prepare a saturated solution of calcium chloride at the temperature of 40 ℃.

Step 3, modulation and molding of green brick pug: and (3) respectively and completely injecting the saturated solutions prepared in the step (2) into green brick powder raw materials, adding 860mL of tap water, stirring the green brick powder to be uniform, aging for 10.5 hours, and then airing the green brick powder raw materials at 40 ℃ until the water content is 20% to prepare pug. The prepared wet pug is put into a die, and pressure of 1MPa is applied to shape the pug and prepare wet green bricks with the size of 240 multiplied by 115 multiplied by 55 mm.

Step 4, alternating current sintering densification of the green brick: horizontally orienting the maximum surface of the blank obtained in the step (3) at 40 ℃, then placing the blank between two flat graphite plates connected with an alternating current power supply, and enabling two electrodes to be in close contact with the blank, wherein the area of the electrodes covers the upper surface and the lower surface of the blank, micro round through holes are uniformly distributed on the flat electrode at the upper end, the diameter of the through holes is phi 1mm, and the distribution density of the through holes is 1/cm²And a mechanical pressure of 1MPa was applied and maintained by the electrodes. Switching on a power supply, adjusting the working state of the power supply to be in a constant current mode, and adjusting the current to ensure that the current intensity applied to the two ends of the blank is 13.04A/cm²And heating and sintering the green brick under current, and electrifying for 75s to obtain the building block with the density of 88.1 percent.

Example 13: method for preparing building block by furnace-free rapid sintering at 4 DEG C

Step 1, weighing raw material of green brick powder: mixing clay powder with the particle size of 0.3-3 mm, diatomite powder with the particle size of 0.3-2 mm and shale powder with the particle size of 0.1-1 mm according to the weight ratio of 1:1: 845 g, 845 g and 845 g are respectively taken according to the proportion of 1, and are uniformly mixed to obtain the green brick powder raw material.

Step 2, preparation of saturated solution of sodium nitrate: 76.5 g of analytically pure sodium nitrate powder was weighed, and at 4 ℃, sodium nitrate was added to 100mL of distilled water, and stirred uniformly with a magnetic stirrer until the solution was clear, to prepare a saturated solution of sodium nitrate at 4 ℃.

Step 3, modulation and molding of green brick pug: and (3) completely injecting the saturated sodium nitrate solution prepared in the step (2) into the green brick powder raw material, adding 800mL of tap water, stirring the green brick powder uniformly, aging for 12 hours, and airing the green brick powder raw material at 50 ℃ until the water content is 5% to prepare a pug. The prepared wet pug is put into a mould, and pressure of 41.5MPa is applied to make the pug shaped and prepare wet green bricks with the size of 240 multiplied by 115 multiplied by 53 mm.

Step 4, alternating current sintering densification of the green brick: at 4 ℃, the most part of the green body obtained in the step 3 is put intoHorizontally orienting the large surface, placing the blank between two flat graphite electrodes connected with an alternating current power supply, and making the two electrodes closely contact with the blank, wherein the electrode area covers the upper and lower surfaces of the blank, small circular through holes are uniformly distributed on the flat electrode at the upper end, the diameter of the through holes is phi 1mm, and the distribution density of the through holes is 1/cm²And a mechanical pressure of 2MPa is applied and maintained by the electrodes. Switching on a power supply, adjusting the working state of the power supply to be in a constant current mode, and adjusting the current to ensure that the current intensity applied to the two ends of the blank is 12.68A/cm²And heating and sintering the green brick under current, and electrifying for 78s to obtain the building block with the density of 87.5 percent.

Example 14: method for preparing building block by furnace-free rapid sintering at 40 DEG C

Step 1, weighing raw material of green brick powder: mixing clay powder with the particle size of 0.1-1.2 mm, diatomite powder with the particle size of 0.2-1.5 mm and coal gangue powder with the particle size of 0.8-3 mm according to the weight ratio of 1:1: 845 g, 845 g and 845 g are respectively taken according to the proportion of 1, and are uniformly mixed to obtain the green brick powder raw material.

Step 2, preparing saturated solutions of potassium sulfate and copper chloride respectively: weighing 14.8 g of analytically pure potassium sulfate powder and 87.6 g of analytically pure copper chloride powder, adding the weighed potassium sulfate powder into 100mL of distilled water at 40 ℃, and uniformly stirring by using a magnetic stirrer to prepare a potassium sulfate saturated solution at 40 ℃; the weighed copper chloride powder was added to 100mL of distilled water, 1.0mol/L hydrochloric acid was added to adjust the pH to 3 until the solution was clear, and the solution was stirred uniformly with a magnetic stirrer to prepare a saturated solution of copper chloride at 40 ℃.

Step 3, modulation and molding of green brick pug: and (3) respectively and completely injecting the saturated solutions prepared in the step (2) into green brick powder raw materials, adding 800mL of tap water, stirring the green brick powder to be uniform, aging for 11 hours, and airing the green brick powder raw materials at 48 ℃ until the water content is 8% to prepare pug. The prepared wet pug is put into a mould, and pressure of 2MPa is applied to make the pug shaped to prepare wet green bricks with the size of 240 multiplied by 115 multiplied by 53 mm.

Step 4, alternating current sintering densification of the green brick: orienting the maximum plane of the blank obtained in the step 3 horizontally at 40 ℃,then placing the blank between two flat graphite electrodes connected with an alternating current power supply, and making the two electrodes closely contact with the blank, wherein the area of the electrodes covers the upper surface and the lower surface of the blank, micro round through holes are uniformly distributed on the flat electrode at the upper end, the diameter of the through holes is phi 1mm, and the distribution density of the through holes is 1/cm²And a mechanical pressure of 6MPa was applied and maintained by the electrodes. Switching on a power supply, adjusting the working state of the power supply to be in a constant current mode, and adjusting the current to ensure that the current intensity applied to the two ends of the blank is 13.04A/cm²And heating and sintering the green brick under current, and electrifying for 76s to obtain the building block with the density of 88.1 percent.

Example 15: method for preparing building block by furnace-free rapid sintering at 30 DEG C

Step 1, weighing raw material of green brick powder: mixing clay powder with the particle size of 0.2-1.5 mm, diatomite powder with the particle size of 0.1-1.2 mm and sludge powder with the particle size of 0.3-2.5 mm according to the weight ratio of 1:1: the raw materials of the green brick powder are obtained by uniformly mixing 1000 g, 1000 g and 1000 g of the raw materials according to the proportion of 1.

Step 2, preparing saturated solutions of barium chloride and zinc sulfate respectively: weighing 114.3 g of analytically pure barium chloride powder and 183.9 g of analytically pure zinc sulfate powder, adding the weighed barium chloride powder into 300mL of distilled water at the temperature of 30 ℃, and uniformly stirring by using a magnetic stirrer to prepare a barium chloride saturated solution at the temperature of 30 ℃; adding weighed zinc sulfate powder into 300mL of distilled water, adding 1.0mol/L hydrochloric acid to adjust the pH value to 3 until the solution is clear, and uniformly stirring by using a magnetic stirrer to prepare a saturated zinc sulfate solution at the temperature of 30 ℃.

Step 3, modulation and molding of green brick pug: and (3) respectively and completely injecting the saturated solutions prepared in the step (2) into green brick powder raw materials, adding 800mL of tap water, stirring the green brick powder to be uniform, aging for 11 hours, and airing the green brick powder raw materials at 48 ℃ until the water content is 8% to prepare pug. The prepared wet pug is put into a mould, and pressure of 40MPa is applied to make the pug shaped and prepare wet green bricks with the size of 240 multiplied by 115 multiplied by 55 mm.

Step 4, alternating current sintering densification of the green brick: orienting the maximum plane level of the green body obtained in step 3 at 30 ℃, and then orienting the green bodyPlacing between two flat tungsten electrodes connected with AC power supply, and making the two electrodes closely contact with the blank, wherein the electrode area covers the upper and lower surfaces of the blank, micro round through holes are uniformly distributed on the upper flat electrode, the diameter of the through holes is 1mm, and the distribution density of the through holes is 1/cm²And a mechanical pressure of 4MPa was applied and maintained by the electrodes. Switching on a power supply, adjusting the working state of the power supply to be in a constant current mode, and adjusting the current to ensure that the current intensity applied to the two ends of the blank is 13.77A/cm²And heating and sintering the green brick under current, and electrifying for 69s to obtain the building block with the density of 88.1 percent.

Example 16: method for preparing building block by furnace-free rapid sintering at 30 DEG C

Step 1, weighing raw material of green brick powder: clay powder with the particle size of 0.3-1.8 mm, shale powder with the particle size of 0.1-1.2 mm and coal gangue powder with the particle size of 0.4-2.5 mm are mixed according to the weight ratio of 1:1:1, taking 846 g, 846 g and 846 g respectively, and uniformly mixing to obtain the green brick powder raw material.

Step 2, preparation of saturated solutions of manganese chloride, nickel nitrate and cobalt sulfate: weighing 80.8 g of analytically pure manganese chloride powder, 105 g of analytically pure nickel nitrate powder and 42 g of analytically pure cobalt sulfate powder, adding the weighed manganese chloride powder into 100mL of distilled water at 30 ℃, adding 1.0mol/L hydrochloric acid to adjust the pH value to 3 until the solution is clarified, and uniformly stirring by using a magnetic stirrer to prepare a saturated manganese chloride solution at 30 ℃; adding weighed nickel nitrate powder into 100mL of distilled water, adding 1.0mol/L hydrochloric acid to adjust the pH value to 3 until the solution is clear, and uniformly stirring the solution by using a magnetic stirrer to prepare a nickel nitrate saturated solution at the temperature of 30 ℃; adding weighed cobalt sulfate powder into 100mL of distilled water, adding 1.0mol/L hydrochloric acid to adjust the pH value to 3 until the solution is clear, and uniformly stirring by using a magnetic stirrer to prepare a cobalt sulfate saturated solution at the temperature of 30 ℃.

Step 3, modulation and molding of green brick pug: and (3) respectively and completely injecting the saturated solutions prepared in the step (2) into green brick powder raw materials, adding 900mL of distilled water, stirring the green brick powder to be uniform, aging for 12 hours, and airing the green brick powder raw materials at 48 ℃ until the water content is 6% to prepare pug. The prepared wet pug is put into a mould, and pressure of 42.3MPa is applied to shape the pug and prepare wet green bricks with the size of 240 multiplied by 115 multiplied by 53 mm.

Step 4, alternating current sintering densification of the green brick: horizontally orienting the maximum surface of the blank obtained in the step (3) at 30 ℃, then placing the blank between two flat graphite electrodes connected with an alternating current power supply, and enabling the two electrodes to be in close contact with the blank, wherein the area of the electrodes covers the upper surface and the lower surface of the blank, micro round through holes are uniformly distributed on the flat electrode at the upper end, the diameter of the through holes is phi 1mm, and the distribution density of the through holes is 0.5/cm²And a mechanical pressure of 3MPa was applied and maintained by the electrodes. Switching on a power supply, adjusting the working state of the power supply to be in a constant current mode, and adjusting the current to ensure that the current intensity applied to the two ends of the blank is 13.77A/cm²And the green brick is heated and sintered under current, and is electrified for 50s to obtain the building block with the density of 81.3 percent.

Example 17: method for preparing building block by furnace-free rapid sintering at 30 DEG C

Step 1, weighing raw material of green brick powder: clay powder with the particle size of 0.1-1.8 mm, shale powder with the particle size of 0.2-1.2 mm and coal gangue powder with the particle size of 0.2-2.5 mm are mixed according to the ratio of 2: 1: 1250 g, 625 g and 625 g are respectively taken according to the proportion of 1 and are uniformly mixed to obtain the green brick powder raw material.

Step 3, modulation and molding of green brick pug: and (3) respectively and completely injecting the saturated solutions prepared in the step (2) into green brick powder raw materials, adding 1000mL of tap water, stirring the green brick powder to be uniform, aging for 12 hours, and then airing the green brick powder raw materials at 38 ℃ until the water content is 25% to prepare pug. The prepared wet pug is put into a mould, and pressure of 1MPa is applied to make the pug shaped to prepare wet green bricks with the size of 240 multiplied by 115 multiplied by 53 mm.

Step 4, alternating current sintering densification of the green brick: horizontally orienting the maximum surface of the blank obtained in the step (3) at 30 ℃, then placing the blank between two flat graphite electrodes connected with an alternating current power supply, and enabling the two electrodes to be in close contact with the blank, wherein the area of the electrodes covers the upper surface and the lower surface of the blank, micro round through holes are uniformly distributed on the flat electrode at the upper end, the diameter of the through holes is phi 3mm, and the distribution density of the through holes is 0.5/cm²And a mechanical pressure of 8MPa was applied and maintained by the electrodes. Switching on a power supply, adjusting the working state of the power supply to be in a constant current mode, and adjusting the current to ensure that the current intensity applied to the two ends of the blank is 14.13A/cm²And heating and sintering the green brick under current, and electrifying for 70s to obtain the building block with the density of 90%.

Example 18: method for preparing building block by furnace-free rapid sintering at 30 DEG C

Step 1, weighing raw material of green brick powder: clay powder with the particle size of 0.3-1.8 mm, shale powder with the particle size of 0.3-1.2 mm and sludge powder with the particle size of 0.1-1.3 mm are mixed according to the weight ratio of 1:1: 847 g, 847 g and 847 g are respectively taken according to the proportion of 1 and are uniformly mixed to obtain green brick powder raw materials.

Step 2, preparing saturated solutions of magnesium chloride, sodium nitrate and lithium sulfate respectively: weighing 55.8 g of analytically pure magnesium chloride powder, 94.9 g of analytically pure sodium nitrate powder and 34.2 g of analytically pure lithium sulfate powder, adding the weighed magnesium chloride powder into 100mL of distilled water at 30 ℃, adding 1.0mol/L hydrochloric acid to adjust the pH value to 3 until the solution is clear, and uniformly stirring by using a magnetic stirrer to prepare a magnesium chloride saturated solution at 30 ℃; adding weighed sodium nitrate powder into 100mL of distilled water, and uniformly stirring by using a magnetic stirrer to prepare a saturated solution of sodium nitrate at the temperature of 30 ℃; adding weighed lithium sulfate powder into 100mL of distilled water, adding 1.0mol/L hydrochloric acid to adjust the pH value to 3 until the solution is clear, and uniformly stirring by using a magnetic stirrer to prepare a lithium sulfate saturated solution at the temperature of 30 ℃.

Step 3, modulation and molding of green brick pug: and (3) respectively and completely injecting the saturated solutions prepared in the step (2) into green brick powder raw materials, adding 1100mL of tap water, stirring the green brick powder to be uniform, aging for 12 hours, and airing the green brick powder raw materials at 38 ℃ until the water content is 15% to prepare pug. The prepared wet pug is put into a mould, and pressure of 12.5MPa is applied to shape the pug and prepare wet green bricks with the size of 240 multiplied by 115 multiplied by 53 mm.

Step 4, alternating current sintering densification of the green brick: horizontally orienting the maximum surface of the blank obtained in the step (3) at 30 ℃, then placing the blank between two flat graphite plates connected with an alternating current power supply, and enabling two electrodes to be in close contact with the blank, wherein the area of the electrodes covers the upper surface and the lower surface of the blank, micro round through holes are uniformly distributed on the flat electrode at the upper end, the diameter of the through holes is phi 1mm, and the distribution density of the through holes is 1/cm²And a mechanical pressure of 1MPa was applied and maintained by the electrodes. Switching on a power supply, adjusting the working state of the power supply to be in a constant current mode, and adjusting the current to ensure that the current intensity applied to the two ends of the blank is 13.41A/cm²And the green brick is heated and sintered under current for 85s, so that the building block with the density of 89.5% is obtained.

Example 19: method for preparing building block by furnace-free rapid sintering at 20 DEG C

Step 1, weighing raw material of green brick powder: clay powder with the particle size of 0.2-1.8 mm, coal gangue powder with the particle size of 0.1-1.2 mm and sludge powder with the particle size of 0.1-1.3 mm are mixed according to the weight ratio of 1:1: 845 g, 845 g and 845 g are respectively taken according to the proportion of 1, and are uniformly mixed to obtain the green brick powder raw material.

Step 2, preparation of saturated solutions of calcium chloride, aluminum nitrate and sodium sulfate: weighing 74.5 g of analytically pure calcium chloride powder, 73.9 g of analytically pure aluminum nitrate powder and 19.5 g of analytically pure sodium sulfate powder, adding the weighed calcium chloride powder into 100mL of distilled water at the temperature of 20 ℃, and uniformly stirring by using a magnetic stirrer to prepare a calcium chloride saturated solution at the temperature of 20 ℃; adding weighed aluminum nitrate powder into 100mL of distilled water, adding 1.0mol/L hydrochloric acid to adjust the pH value to 3 until the solution is clear, and uniformly stirring by using a magnetic stirrer to prepare an aluminum nitrate saturated solution at the temperature of 20 ℃; the weighed sodium sulfate powder was added to 100mL of distilled water, and stirred uniformly with a magnetic stirrer to prepare a saturated solution of sodium sulfate at 20 ℃.

Step 3, modulation and molding of green brick pug: and (3) respectively and completely injecting the saturated solutions prepared in the step (2) into green brick powder raw materials, adding 700mL of tap water, stirring the green brick powder to be uniform, aging for 12 hours, and airing the green brick powder raw materials at 48 ℃ until the water content is 5% to prepare pug. The prepared wet pug is put into a mould, and pressure of 22.1MPa is applied to shape the pug and prepare wet green bricks with the size of 240 multiplied by 115 multiplied by 53 mm.

Step 4, alternating current sintering densification of the green brick: horizontally orienting the maximum surface of the blank obtained in the step (3) at 20 ℃, then placing the blank between two flat graphite plates connected with an alternating current power supply, and enabling two electrodes to be in close contact with the blank, wherein the area of the electrodes covers the upper surface and the lower surface of the blank, micro round through holes are uniformly distributed on the flat electrode at the upper end, the diameter of the through holes is phi 1mm, and the distribution density of the through holes is 1/cm²And a mechanical pressure of 1MPa was applied and maintained by the electrodes. Switching on a power supply, adjusting the working state of the power supply to be in a constant current mode, and adjusting the current to ensure that the current intensity applied to the two ends of the blank is 13.41A/cm²And the green brick is heated and sintered under current, and is electrified for 87s to obtain the building block with the density of 89.5 percent.

Example 20: method for preparing building block by furnace-free rapid sintering at 60 DEG C

Step 1, weighing raw material of green brick powder: clay powder with the particle size of 0.3-1.8 mm, fly ash powder with the particle size of 0.1-1.2 mm and sludge powder with the particle size of 0.2-1.3 mm are mixed according to the weight ratio of 1:1:1, respectively taking 900 g, 900 g and 900 g, and uniformly mixing to obtain the green brick powder raw material.

Step 2, preparation of a potassium nitrate saturated solution: 106 g of analytically pure potassium nitrate powder is weighed, added into 100mL of distilled water at 60 ℃, and stirred uniformly by a magnetic stirrer until the solution is clear, so as to prepare a potassium nitrate saturated solution at 60 ℃.

Step 3, modulation and molding of green brick pug: and (3) completely injecting the saturated potassium nitrate solution prepared in the step (2) into the green brick powder raw material, adding 900mL of distilled water, stirring the green brick powder to be uniform, aging for 12 hours, and airing the green brick powder raw material at 48 ℃ until the water content is 9% to prepare a pug. The prepared wet pug is put into a die, and pressure of 2.2MPa is applied to shape the pug and prepare wet green bricks with the size of 240 multiplied by 115 multiplied by 55 mm.

Step 4, alternating current sintering densification of the green brick: horizontally orienting the maximum surface of the blank obtained in the step (3) at 60 ℃, then placing the blank between two flat graphite plates connected with an alternating current power supply, and enabling two electrodes to be in close contact with the blank, wherein the area of the electrodes covers the upper surface and the lower surface of the blank, micro round through holes are uniformly distributed on the flat electrode at the upper end, the diameter of the through holes is phi 1mm, and the distribution density of the through holes is 1/cm²And a mechanical pressure of 2MPa is applied and maintained by the electrodes. Switching on a power supply, adjusting the working state of the power supply to be in a constant current mode, and adjusting the current to ensure that the current intensity applied to the two ends of the blank is 13.48A/cm²And heating and sintering the green brick under current, and electrifying for 78s to obtain the building block with the density of 89.6 percent.

Example 21: method for preparing building block by furnace-free rapid sintering at 40 DEG C

Step 1, weighing raw material of green brick powder: diatomite powder with the particle size of 0.3-1.8 mm, shale powder with the particle size of 0.1-1.2 mm and coal gangue powder with the particle size of 0.1-1.3 mm are mixed according to the weight ratio of 1:1: 845 g, 845 g and 845 g are respectively taken according to the proportion of 1, and are uniformly mixed to obtain the green brick powder raw material.

Step 2, preparation of zinc nitrate saturated solution: 211 g of analytically pure zinc nitrate powder is weighed, added into 100mL of distilled water at 40 ℃, added with 1.0mol/L nitric acid to adjust the pH value to 3 until the solution is clarified, and stirred uniformly by a magnetic stirrer to prepare a zinc nitrate saturated solution at 40 ℃.

Step 3, modulation and molding of green brick pug: and (3) completely injecting the zinc nitrate saturated solution prepared in the step (2) into the green brick powder raw material, adding 900mL of distilled water, stirring the green brick powder uniformly, aging for 12 hours, and airing the green brick powder raw material at 47 ℃ until the water content is 11% to prepare a pug. The prepared wet pug is put into a mould, and pressure of 5MPa is applied to make the pug shaped to prepare wet green bricks with the size of 240 multiplied by 115 multiplied by 53 mm.

Step 4, alternating current sintering densification of the green brick: horizontally orienting the maximum surface of the blank obtained in the step (3) at 40 ℃, then placing the blank between two flat graphite plates connected with an alternating current power supply, and enabling two electrodes to be in close contact with the blank, wherein the area of the electrodes covers the upper surface and the lower surface of the blank, micro round through holes are uniformly distributed on the flat electrode at the upper end, the diameter of the through holes is phi 1mm, and the distribution density of the through holes is 1/cm²And a mechanical pressure of 0.5MPa was applied and maintained by the electrodes. Switching on a power supply, adjusting the working state of the power supply to be in a constant current mode, and adjusting the current to ensure that the current intensity applied to the two ends of the blank is 18A/cm²And heating and sintering the green brick under current, and electrifying for 40s to obtain the building block with the density of 82.5 percent.

Example 22: method for preparing building block by furnace-free rapid sintering at 40 DEG C

Step 1, weighing raw material of green brick powder: diatomite powder with the particle size of 0.3-1.9 mm, shale powder with the particle size of 0.1-1.2 mm and fly ash powder with the particle size of 0.2-1.5 mm are mixed according to the proportion of 1:1: 845 g, 845 g and 845 g are respectively taken according to the proportion of 1, and are uniformly mixed to obtain the green brick powder raw material.

Step 2, preparation of a saturated ferric nitrate solution: 175 g of analytically pure iron nitrate powder is weighed, added into 100mL of distilled water at 40 ℃, added with 1.0mol/L nitric acid to adjust the pH value to 3 until the solution is clarified, and stirred uniformly by a magnetic stirrer to prepare an iron nitrate saturated solution at 40 ℃.

Step 3, modulation and molding of green brick pug: and (3) completely injecting the ferric nitrate saturated solution prepared in the step (2) into the green brick powder raw material, adding 900mL of distilled water, stirring the green brick powder uniformly, aging for 12 hours, and airing the green brick powder raw material at 47 ℃ until the water content is 16% to prepare a pug. The prepared wet pug is put into a mould, and pressure of 12.0MPa is applied to shape the pug and prepare wet green bricks with the size of 240 multiplied by 115 multiplied by 52 mm.

Step 4, alternating current sintering densification of the green brick: horizontally orienting the maximum surface of the blank obtained in the step (3) at 40 ℃, then placing the blank between two flat graphite plates connected with an alternating current power supply, and enabling two electrodes to be in close contact with the blank, wherein the area of the electrodes covers the upper surface and the lower surface of the blank, micro round through holes are uniformly distributed on the flat electrode at the upper end, the diameter of the through holes is phi 1mm, and the distribution density of the through holes is 1/cm²And a mechanical pressure of 2MPa is applied and maintained by the electrodes. Switching on a power supply, adjusting the working state of the power supply to be in a constant current mode, and adjusting the current to ensure that the current intensity applied to the two ends of the blank is 13.77A/cm²And heating and sintering the green brick under current, and electrifying for 78s to obtain the building block with the density of 84%.

Example 23: method for preparing building block by furnace-free rapid sintering at 40 DEG C

Step 1, weighing raw material of green brick powder: diatomite powder with the particle size of 0.4-1.9 mm, shale powder with the particle size of 0.1-1.2 mm and sludge powder with the particle size of 0.1-1.5 mm are mixed according to the weight ratio of 1:1: 845 g, 845 g and 845 g are respectively taken according to the proportion of 1, and are uniformly mixed to obtain the green brick powder raw material.

Step 2, preparation of a copper nitrate saturated solution: 163 g of analytically pure copper nitrate powder was weighed, and the powder was added to 100mL of distilled water at 40 ℃, 1.0mol/L nitric acid was added to adjust the pH to 3 until the solution was clarified, and the mixture was stirred uniformly with a magnetic stirrer to prepare a copper nitrate saturated solution at 40 ℃.

Step 3, modulation and molding of green brick pug: and (3) completely injecting the copper nitrate saturated solution prepared in the step (2) into the green brick powder raw material, adding 900mL of tap water, stirring the green brick powder uniformly, aging for 12 hours, and airing the green brick powder raw material at 47 ℃ until the water content is 10% to prepare a pug. The prepared wet pug is put into a mould, and pressure of 30MPa is applied to make the pug shaped to prepare wet green bricks with the size of 240 multiplied by 115 multiplied by 53 mm.

Step 4, alternating current sintering densification of the green brick: orienting the maximum plane of the blank obtained in step 3 at 40 ℃, and then placing the blank between two flat graphite electrodes connected with an alternating current power supplyAnd two electrodes are in close contact with the blank, wherein the area of the electrodes covers the upper surface and the lower surface of the blank, micro round through holes are uniformly distributed on the upper flat electrode, the diameter of the through holes is phi 1mm, and the distribution density of the through holes is 1/cm²And a mechanical pressure of 5MPa was applied and maintained by the electrodes. Switching on a power supply, adjusting the working state of the power supply to be in a constant current mode, and adjusting the current to ensure that the current intensity applied to the two ends of the blank is 13.77A/cm²And heating and sintering the green brick under current, and electrifying for 78s to obtain the building block with the density of 89%.

Example 24: method for preparing building block by furnace-free rapid sintering at 40 DEG C

Step 1, weighing raw material of green brick powder: diatomite powder with the particle size of 0.1-1.9 mm, coal gangue powder with the particle size of 0.1-1.2 mm and fly ash powder with the particle size of 0.2-1.5 mm are mixed according to the weight ratio of 1:1: 845 g, 845 g and 845 g are respectively taken according to the proportion of 1, and are uniformly mixed to obtain the green brick powder raw material.

Step 2, preparing saturated solutions of lithium chloride and sodium sulfate respectively: weighing 224.5 g of analytically pure lithium chloride powder and 122 g of analytically pure sodium sulfate powder, adding the weighed lithium chloride powder into 250mL of distilled water at 40 ℃, adding 1.0mol/L hydrochloric acid to adjust the pH value to 3 until the solution is clear, and uniformly stirring by using a magnetic stirrer to prepare a lithium chloride saturated solution at 40 ℃; the weighed sodium sulfate powder was added to 250mL of distilled water, and stirred uniformly with a magnetic stirrer to prepare a saturated solution of sodium sulfate at 40 ℃.

Step 3, modulation and molding of green brick pug: and (3) respectively and completely injecting the saturated solutions prepared in the step (2) into green brick powder raw materials, adding 500mL of tap water, stirring the green brick powder to be uniform, aging for 12 hours, and airing the green brick powder raw materials at 47 ℃ until the water content is 6% to prepare pug. The prepared wet pug is put into a mould, and pressure of 22.3MPa is applied to shape the pug and prepare wet green bricks with the size of 240 multiplied by 115 multiplied by 53 mm.

Step 4, alternating current sintering densification of the green brick: horizontally orienting the maximum surface of the blank obtained in the step (3) at 40 ℃, then placing the blank between two flat zirconium-titanium-molybdenum alloy electrodes connected with an alternating current power supply,and making the two electrodes closely contact with the blank, wherein the area of the electrodes covers the upper and lower surfaces of the blank, micro round through holes are uniformly distributed on the upper flat plate electrode, the diameter of the through holes is phi 1mm, and the distribution density of the through holes is 1/cm²And a mechanical pressure of 5MPa was applied and maintained by the electrodes. Switching on a power supply, adjusting the working state of the power supply to be in a constant current mode, and adjusting the current to ensure that the current intensity applied to the two ends of the blank body is 13.59A/cm²And heating and sintering the green brick under current, and electrifying for 78s to obtain the building block with the density of 88.2 percent.

Example 25: method for preparing building block by furnace-free rapid sintering at 40 DEG C

Step 1, weighing raw material of green brick powder: mixing diatomite powder with the particle size of 0.5-1.9 mm, coal gangue powder with the particle size of 0.3-1.2 mm and fly ash powder with the particle size of 0.3-1.5 mm according to the weight ratio of 1: 2: 625 g, 1250 g and 625 g are respectively taken according to the proportion of 1 and are uniformly mixed to obtain the green brick powder raw material.

Step 3, modulation and molding of green brick pug: and (3) respectively and completely injecting the saturated solutions prepared in the step (2) into green brick powder raw materials, adding 500mL of tap water, stirring the green brick powder to be uniform, aging for 12 hours, and airing the green brick powder raw materials at 47 ℃ until the water content is 16% to prepare pug. The prepared wet pug is put into a mould, and pressure of 32.5MPa is applied to shape the pug and prepare wet green bricks with the size of 240 multiplied by 115 multiplied by 53 mm.

Step 4, alternating current sintering densification of the green brick: orienting the maximum plane of the blank obtained in step 3 horizontally at 40 ℃, then placing the blank between two flat graphite electrodes connected with an alternating current power supply, and enabling the two flat graphite electrodes to be parallelThe electrode is closely contacted with the blank body, wherein the area of the electrode covers the upper surface and the lower surface of the blank body, tiny circular through holes are uniformly distributed on the upper flat plate electrode, the diameter of each through hole is phi 1mm, and the distribution density of the through holes is 1/cm²And a mechanical pressure of 2MPa is applied and maintained by the electrodes. Switching on a power supply, adjusting the working state of the power supply to be in a constant current mode, and adjusting the current to ensure that the current intensity applied to the two ends of the blank is 13.62A/cm²And heating and sintering the green brick under current, and electrifying for 70s to obtain the building block with the density of 86.6 percent.

Example 26: method for preparing building block by furnace-free rapid sintering at 30 DEG C

Step 1, weighing raw material of green brick powder: diatomite powder with the particle size of 0.2-1.9 mm, coal gangue powder with the particle size of 0.3-1.2 mm and sludge powder with the particle size of 0.1-1.5 mm are mixed according to the weight ratio of 1:1: the raw materials of the green brick powder are obtained by uniformly mixing 1000 g, 1000 g and 1000 g of the raw materials according to the proportion of 1.

Step 2, preparation of ferric chloride and copper sulfate saturated solution: weighing 107 g of analytically pure ferric chloride powder and 37.8 g of analytically pure copper sulfate powder, adding the weighed ferric chloride powder into 100mL of distilled water at 30 ℃, adding 1.0mol/L hydrochloric acid to adjust the pH value to 3 until the solution is clear, and uniformly stirring by using a magnetic stirrer to prepare a ferric chloride saturated solution at 30 ℃; adding weighed copper sulfate powder into 100mL of distilled water, adding 1.0mol/L hydrochloric acid to adjust the pH value to 3 until the solution is clear, and uniformly stirring by using a magnetic stirrer to prepare a copper sulfate saturated solution at the temperature of 30 ℃.

Step 3, modulation and molding of green brick pug: and (3) respectively and completely injecting the saturated solutions prepared in the step (2) into green brick powder raw materials, adding 800mL of tap water, stirring the green brick powder to be uniform, aging for 12 hours, and airing the green brick powder raw materials at 46 ℃ until the water content is 10% to prepare pug. The prepared wet pug is put into a mould, and pressure of 32.5MPa is applied to make the pug shaped and prepare wet green bricks with the size of 240 multiplied by 115 multiplied by 51 mm.

Step 4, alternating current sintering densification of the green brick: orienting the maximum surface level of the green body obtained in step 3 at 30 ℃, and then placing the green body on two flat stones connected with an alternating current power supplyThe ink electrodes are in close contact with the green body, wherein the electrodes cover the upper and lower surfaces of the green body in area, micro round through holes are uniformly distributed on the upper flat electrode, the diameter of each through hole is phi 1mm, and the distribution density of the through holes is 1/cm²And a mechanical pressure of 3MPa was applied and maintained by the electrodes. Switching on a power supply, adjusting the working state of the power supply to be in a constant current mode, and adjusting the current to ensure that the current intensity applied to the two ends of the blank body is 13.59A/cm²And heating and sintering the green brick under current, and electrifying for 78s to obtain the building block with the density of 87.6 percent.

Example 27: method for preparing building block by furnace-free rapid sintering at 40 DEG C

Step 1, weighing raw material of green brick powder: mixing shale powder with the particle size of 0.3-1.9 mm, coal gangue powder with the particle size of 0.1-1.2 mm and fly ash powder with the particle size of 0.2-1.5 mm according to the weight ratio of 1:1: 845 g, 845 g and 845 g are respectively taken according to the proportion of 1, and are uniformly mixed to obtain the green brick powder raw material.

Step 2, preparing saturated solutions of sodium nitrate and aluminum sulfate respectively: weighing 102 g of analytically pure sodium nitrate powder and 45.8 g of analytically pure aluminum sulfate powder, adding the weighed sodium nitrate powder into 100mL of distilled water at 40 ℃, and uniformly stirring by using a magnetic stirrer to prepare a sodium nitrate saturated solution at 40 ℃; adding weighed aluminum sulfate powder into 100mL of distilled water, adding 1.0mol/L hydrochloric acid to adjust the pH value to 3 until the solution is clear, and uniformly stirring by using a magnetic stirrer to prepare an aluminum sulfate saturated solution at the temperature of 40 ℃.

Step 3, modulation and molding of green brick pug: and (3) respectively and completely injecting the saturated solutions prepared in the step (2) into green brick powder raw materials, adding 800mL of tap water, stirring the green brick powder to be uniform, aging for 12 hours, and airing the green brick powder raw materials at 47 ℃ until the water content is 6% to prepare pug. The prepared wet pug is put into a mould, and pressure of 22.6MPa is applied to shape the pug and prepare wet green bricks with the size of 240 multiplied by 115 multiplied by 53 mm.

Step 4, alternating current sintering densification of the green brick: horizontally orienting the maximum surface of the blank obtained in the step (3) at 40 ℃, then placing the blank between two flat graphite electrodes connected with an alternating current power supply,and making the two electrodes closely contact with the blank, wherein the area of the electrodes covers the upper and lower surfaces of the blank, micro round through holes are uniformly distributed on the upper flat plate electrode, the diameter of the through holes is phi 1mm, and the distribution density of the through holes is 0.6/cm²And a mechanical pressure of 2MPa is applied and maintained by the electrodes. Switching on a power supply, adjusting the working state of the power supply to be in a constant current mode, and adjusting the current to ensure that the current intensity applied to the two ends of the blank is 13.77A/cm²And heating and sintering the green brick under current, and electrifying for 82s to obtain the building block with the density of 89.2%.

Example 28: method for preparing building block by furnace-free rapid sintering at 40 DEG C

Step 1, weighing raw material of green brick powder: mixing shale powder with the particle size of 0.1-1.9 mm, coal gangue powder with the particle size of 0.2-1.2 mm and fly ash powder with the particle size of 0.1-1.5 mm according to the weight ratio of 1:1: 2, respectively taking 625 g, 625 g and 1250 g, and uniformly mixing to obtain the green brick powder raw material.

Step 3, modulation and molding of green brick pug: and (3) respectively and completely injecting the saturated solutions prepared in the step (2) into green brick powder raw materials, adding 800mL of tap water, stirring the green brick powder to be uniform, aging for 12 hours, and airing the green brick powder raw materials at 37 ℃ until the water content is 10% to prepare pug. The prepared wet pug is put into a mould, and pressure of 12.5MPa is applied to shape the pug and prepare wet green bricks with the size of 240 multiplied by 115 multiplied by 53 mm.

Step 4, alternating current sintering densification of the green brick: horizontally orienting the maximum surface of the blank obtained in the step 3 at 40 ℃, then placing the blank between two flat-plate graphites connected with an alternating current power supply, and enabling two electrodesClosely contact with the blank, wherein the electrode area covers the upper and lower surfaces of the blank, micro round through holes are uniformly distributed on the upper flat electrode, the diameter of the through holes is phi 1mm, and the distribution density of the through holes is 1/cm²And a mechanical pressure of 2MPa is applied and maintained by the electrodes. Switching on a power supply, adjusting the working state of the power supply to be in a constant current mode, and adjusting the current to ensure that the current intensity applied to the two ends of the blank is 13.80A/cm²And heating and sintering the green brick under current, and electrifying for 86s to obtain the building block with the density of 89.3 percent.

Example 29: method for preparing building block by furnace-free rapid sintering at 40 DEG C

Step 1, weighing raw material of green brick powder: mixing clay powder with the particle size of 0.3-4 mm, coal gangue powder with the particle size of 0.2-3 mm and fly ash powder with the particle size of 0.1-2.5 mm according to the weight ratio of 1: 2: and 3, respectively taking 410 g, 830 g and 1247 g, and uniformly mixing to obtain the green brick powder raw material.

Step 2, preparing saturated solutions of copper chloride and aluminum nitrate respectively: weighing 87.6 g of analytically pure copper chloride powder and 88.7 g of analytically pure aluminum nitrate powder, adding the weighed copper chloride powder into 100mL of distilled water at 40 ℃, adding 1.0mol/L hydrochloric acid to adjust the pH value to 3 until the solution is clear, and uniformly stirring by using a magnetic stirrer to prepare a saturated solution of copper chloride at 40 ℃; the weighed aluminum nitrate powder is added into 100mL of distilled water, 1.0mol/L hydrochloric acid is added to adjust the pH value to 3 until the solution is clear, and the solution is stirred uniformly by a magnetic stirrer to prepare an aluminum nitrate saturated solution at the temperature of 40 ℃.

Step 3, modulation and molding of green brick pug: and (3) respectively and completely injecting the saturated solutions prepared in the step (2) into green brick powder raw materials, adding 800mL of distilled water, stirring the green brick powder to be uniform, aging for 12 hours, and airing the green brick powder raw materials at 45 ℃ until the water content is 15% to prepare pug. The prepared wet pug is put into a die, and pressure of 2.1MPa is applied to form the pug into a wet green brick with the size of 240 multiplied by 115 multiplied by 45 mm.

Step 4, direct current sintering densification of the green brick: orienting the maximum plane of the blank obtained in the step 3 at 40 ℃, and then placing the blank into two flat graphite electrodes connected with a direct current power supplyBetween the electrodes, two electrodes are in close contact with the blank, wherein the electrode area covers the upper and lower surfaces of the blank, micro round through holes with diameter phi of 2mm are uniformly distributed on the upper flat electrode, and the distribution density of the through holes is 1/cm²And a mechanical pressure of 1MPa was applied and maintained by the electrodes. Switching on a power supply, adjusting the working state of the power supply to be in a constant current mode, and adjusting the current to ensure that the current intensity applied to the two ends of the blank is 13.77A/cm²And heating and sintering the green brick under current, and electrifying for 76s to obtain the building block with the compactness of 89%.

Claims

1. A method for rapidly preparing a sintered building block without a furnace at normal temperature is characterized by comprising the following steps: the raw materials of the green brick powder are two or more of clay powder, diatomite powder, sandstone powder, shale powder, coal gangue powder, fly ash or sludge powder; or the chemical component in the raw material or pug of the building block contains SiO₂、Al₂O₃CaO, MgO or Fe₂O₃One or more of oxides; or the raw materials simultaneously contain one or more of the following components: 1. crystal water or adsorbed water; 2. alkali metal oxides or alkaline earth metal oxides or other transition metal oxides or rare earth metal oxides; 3. non-oxide or metal oxide double salts;

the method for making the building block comprises the following steps:

and step 3: respectively injecting the prepared one or more water-soluble metal salt saturated solutions into green brick powder raw materials, adding water to stir the green brick powder to be uniform, aging for 0.5-24 hours, and then airing the green brick powder raw materials at 10-100 ℃ until the water content is 5-25% to prepare pug; putting the prepared wet pug into a mold, and applying pressure of 1-50 MPa to form the pug into a wet green brick;

and 4, step 4: at the temperature of 4-60 ℃, horizontally orienting the maximum surface of the formed wet green brick, placing the green brick between two electrodes connected with a direct current power supply or an alternating current power supply to ensure that the two electrodes are in close contact with the green brick, turning on the power supply, adjusting the working state of the power supply to be in a constant current mode, and adjusting the current to ensure that the current intensity applied to the two ends of the green brick is between 0.5A/cm²～25A/cm²Applying and maintaining the mechanical pressure of 0.1-10 MPa through electrodes, heating and sintering the wet brick blank under current, and electrifying for 0.1-20 min to obtain a sintered brick or a sintered building block with certain density;

the electrode material is a metal material with a melting point higher than 1800 ℃, or an alloy material with a melting point higher than 1800 ℃ or a graphite material;

2. The method for the furnace-free rapid preparation of sintered building blocks at room temperature according to claim 1, characterized in that: the grain diameter of the raw material powder is not more than 3.0 mm.

3. The method for the furnace-free rapid preparation of sintered building blocks at room temperature according to claim 1, characterized in that: the water is distilled water or tap water.

4. The method for the furnace-free rapid preparation of sintered building blocks at room temperature according to claim 1, characterized in that: the water-soluble metal salt is a water-soluble salt of an alkali metal, a water-soluble salt of an alkaline earth metal or various water-soluble salts of transition metal elements.

5. The method for the furnace-free rapid preparation of sintered building blocks at room temperature according to claim 4, wherein: water-soluble salts of the alkali metals: including alkali metal halide salts: ACl, a ═ Li, Na, K, Rb, Cs; or alkali metal sulfate: a. the₂SO₄A ═ Li, Na, K, Rb, Cs; or alkali metal nitrates: ANO₃A ═ Li, Na, K, Rb, Cs; or an alkali metal carbonate: a. the₂CO₃A ═ Li, Na, K, Rb, Cs; or alkali metal phosphates: a. the₃PO₄A ═ Li, Na, K, Rb, Cs; or a water-soluble organic acid salt of an alkali metal.

6. The method for the furnace-free rapid preparation of sintered building blocks at room temperature according to claim 4, wherein: water-soluble salts of the alkaline earth metals: comprises the following halides: BCl₂B ═ Mg, Ca, Sr, Ba; or an alkaline earth metal nitrate: b (NO)₃)₂，B＝Mg、Ca、Sr、Ba。

7. The method for the furnace-free rapid preparation of sintered building blocks at room temperature according to claim 4, wherein: various water-soluble salts of the transition metal elements: comprises water-soluble halide salt, water-soluble sulfate, water-soluble nitrate or water-soluble phosphate of the transition metal elements of aluminum Al, zinc Zn, iron Fe, copper Cu, manganese Mn, nickel Ni, cobalt Co, indium In, tin Sn, antimony Sb, bismuth Bi or zirconium Zr.