CN111253093B - Cementing material containing coal-to-liquid coarse slag and preparation method thereof - Google Patents

Cementing material containing coal-to-liquid coarse slag and preparation method thereof Download PDF

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CN111253093B
CN111253093B CN202010178123.XA CN202010178123A CN111253093B CN 111253093 B CN111253093 B CN 111253093B CN 202010178123 A CN202010178123 A CN 202010178123A CN 111253093 B CN111253093 B CN 111253093B
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slag
particles
coarse
steel slag
fine particles
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CN111253093A (en
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巴浩静
杨兑亨
赵智利
倪文
杨海
杨志江
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Shexian County Qingzhang Cement Manufacturing Co ltd
University of Science and Technology Beijing USTB
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Shexian County Qingzhang Cement Manufacturing Co ltd
University of Science and Technology Beijing USTB
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    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B7/00—Hydraulic cements
    • C04B7/24—Cements from oil shales, residues or waste other than slag
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B7/00—Hydraulic cements
    • C04B7/36—Manufacture of hydraulic cements in general
    • C04B7/38—Preparing or treating the raw materials individually or as batches, e.g. mixing with fuel
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B7/00—Hydraulic cements
    • C04B7/36—Manufacture of hydraulic cements in general
    • C04B7/48—Clinker treatment
    • C04B7/52—Grinding ; After-treatment of ground cement
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P40/00—Technologies relating to the processing of minerals
    • Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding

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  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Materials Engineering (AREA)
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  • Organic Chemistry (AREA)
  • Disintegrating Or Milling (AREA)
  • Processing Of Solid Wastes (AREA)
  • Crushing And Grinding (AREA)

Abstract

The invention relates to a cementing material containing coal-to-liquid coarse slag and a preparation method thereof, wherein the cementing material comprises the following raw materials in parts by weight: 3-30 parts of coal-made oil coarse slag, 20-60 parts of slag, 10-40 parts of steel slag particles and 5-20 parts of gypsum. The cementing material effectively utilizes coal-to-liquid coarse slag and solid wastes such as steel slag, gypsum and the like; the material grade is good, and the material has good stability and excellent mechanical properties. The preparation method provided by the invention has the advantages of simple process, easiness in operation, low energy consumption, no waste, no pollution, high efficiency, environmental friendliness and the like.

Description

Cementing material containing coal-to-liquid coarse slag and preparation method thereof
Technical Field
The invention relates to the field of resource utilization of industrial solid wastes and the technical field of building materials, in particular to a cementing material containing coal-to-liquid coarse residues and a preparation method thereof.
Background
The coal-made oil slag belongs to one of coal gasification slag, generally comprises coarse slag and fine slag, and only the coal gasification slag production of Yulin city is estimated to reach 1031.9 ten thousand tons in 2020. The coarse slag is produced in a gasification furnace, coal particles are slurried under high temperature and high pressure, then are subjected to processes of melting, chilling, condensation and the like, are discharged from a slag discharge hopper at the bottom of the gasification furnace, and contain certain moisture and residual carbon. At present, the treatment mode of coal-to-liquids coarse slag is mostly stockpiled or landfill, and because it contains multiple metals, very easily causes pollution to surface water, groundwater and soil, and stockpiled still produces the raise dust scheduling problem easily.
At present, the coal-to-liquid coarse slag is distributed in inner Mongolia Ordos, Shanxi elmin, Ningxianning east, Xinjiang east and the like, and along with the fact that coal is utilized according to quality to become the mainstream trend of the coal gasification industry, the production capacity of the coal-to-liquid coarse slag is increased under the background of the high-speed development of the modern coal chemical industry in China.
The crude coal-to-liquid residue used in the present invention is obtained from a coal-to-liquid plant in Shanxi province, and is black in color. The detection result shows that the residual carbon of the coal-based oil coarse slag is extremely low, the ignition loss is about 0-3%, and the result of thermogravimetric differential heating shows that the coal-based oil coarse slag has almost no mass loss. The XRD (X-ray diffraction analysis) analysis result showed that the crude coal oil slag had no crystal morphology, contained no crystal, and exhibited a good amorphous state. The XRF (X-ray fluorescence spectrum analysis) analysis result shows that the coal-made oil coarse slag contains abundant calcium oxide, silicon dioxide, aluminum oxide and a certain amount of iron oxide, wherein the total amount of the silicon dioxide and the aluminum oxide is more than 72%, the content of the calcium oxide is more than 15%, the content of the iron oxide is about 5%, and the total amount of the above oxides accounts for about 93%, so that the coal-made oil coarse slag has potential as a high-quality building material raw material, and can be widely applied to the production of cementing materials, concrete, building bricks, wall materials and the like.
Patent document CN108817030A provides a method for activating coal gasification fine slag, which comprises grinding coal gasification fine slag and alkaline medium powder, mixing uniformly, and introducing a proper amount of oxygen-containing atmosphere at a low external temperature (the temperature is lower than the temperature required for solid phase reaction), so as to promote the rapid combustion of unburnt substances in the coal gasification fine slag. And the heat generated quickly can quickly raise the temperature of the reactants to a temperature suitable for the generation of the solid phase reaction, and finally, the silicon-aluminum compound in the fine slag is quickly converted into an active phase. The active phase is easy to separate and extract chemical components such as Al, Si, Fe and the like by a chemical method. However, the method is only suitable for treating the coal gasification fine slag with high residual carbon content, and does not relate to a method for treating coal-to-liquid coarse slag almost containing no residual carbon, and the treatment process is complex.
Patent document CN107986643A discloses a method for preparing an adsorption material by using coal gasification fine slag, which comprises the following steps: a. adding water to prepare coal gasification fine slag slurry; b. preparing silicon-rich composite slurry and carbon-rich composite slurry; c. preparing the carbon-rich adsorption material. However, the method is still only suitable for treating the coal gasification fine slag with high residual carbon content, and does not relate to a method for treating coal-to-liquid coarse slag almost containing no residual carbon, and the treatment process is complex and the cost is high.
Therefore, in order to solve the problems in the prior art, the technical personnel in the field are dedicated to search a method which has simple process, economy and reasonability, can fully and effectively utilize the crude slag of the coal-to-liquid oil, and can simultaneously and comprehensively utilize industrial solid wastes such as slag, steel slag, gypsum and the like.
Disclosure of Invention
The invention aims to provide a cementing material containing coal-to-liquid coarse slag and a preparation method thereof.
Therefore, the invention provides a cementing material containing coal-to-liquid coarse residues, which comprises the following raw materials in parts by weight: 3-30 parts of coal-made oil coarse slag, 20-60 parts of slag, 10-40 parts of steel slag particles and 5-20 parts of gypsum.
Wherein the coal-to-liquid coarse slag is coarse slag generated in the coal-to-liquid chemical industry.
Further, the slag is water quenched blast furnace slag.
Further, the steel slag particles are obtained by removing iron, crushing and screening from a steel slag raw material; the steel slag raw material is one or more of converter steel slag, hot splashing steel slag, hot stuffy steel slag, roller steel slag and electric furnace slag.
Further, the granularity of the steel slag particles is less than 3 mm.
Further, the preparation method of the steel slag particles comprises the following steps: the method comprises the following steps of (1) crushing a steel slag raw material after iron removal, and screening to obtain coarse particles I and fine particles I, wherein the granularity of the coarse particles I is larger than 10mm, and the granularity of the fine particles I is smaller than 10 mm; the coarse particles I are continuously crushed after iron removal to form closed cycle; after the fine particles I are subjected to powder selection by a powder selector, steel slag sand and fine particles II are formed, wherein the granularity of the steel slag sand is 3-10mm, and the granularity of the fine particles II is less than 3 mm; the fine particles II are the prepared steel slag particles.
Further, a rolling crusher or a jaw crusher is adopted for crushing; preferably, a rolling crusher is adopted, and the granularity of the steel slag crushed by the rolling crusher is smaller and more uniform compared with that of a jaw crusher.
Further, the gypsum is one or more of desulfurized gypsum, phosphogypsum, fluorgypsum, lemon gypsum and waste ceramic mold gypsum.
Further, the coal-to-liquid coarse slag comprises the following components in parts by weight: 13-16 parts of CaO, SiO245-50 parts of Al2O322-26 parts of MgO, 0-2 parts of SO30 to 1 part of Fe2O34-6 parts of calcium carbonate, and 0-3 parts of loss on ignition.
Further, the slag comprises the following components in parts by weight: 38-42 parts of CaO, SiO224-28 parts of Al2O313-17 parts of MgO 8-12 parts of SO31-3 parts of Fe2O30-2 parts of.
Further, the steel slag comprises the following raw materials in parts by weight: CaO 45-49 parts, SiO28-12 parts of Al2O31-4 parts of MgO 2-6 parts of SO30 to 1 part of Fe2O320-28 parts.
Further, the gypsum comprises the following components in parts by weight: 46-50 parts of CaO, SiO20 to 1 part of Al2O30-1 part of MgO, 1-3 parts of SO342-46 parts.
Further, the specific surface area of the cementing material is 450m2/kg-600m2Per kg; the particle size meets the following conditions: the granularity is more than 0 and less than or equal to 130 mu m; 0.045mm screen residue 1.0-5.0%, 0.080mm screen residue 0-3.0%, and iron content 0.5-2.0%.
In a second aspect of the present invention, there is provided a method for preparing the cement material, comprising:
weighing coal-made oil coarse slag, steel slag particles and gypsum according to specified weight parts, mixing the raw materials, and then grinding the mixture by a grinding device to obtain fine particles III, coarse particles II and coarse particles III, winnowing the fine particles III, feeding the fine particles III into a dust collector, and enabling the coarse particles II to fall back to a grinding disc of the grinding device for continuous grinding; after iron is removed, the coarse particles III are continuously ground by a grinding device, circulation is formed in this way until all raw materials enter a dust collector, and the cementing material is obtained;
wherein the particle size of the fine particles III satisfies the following condition: the granularity is more than 0 and less than or equal to 130 mu m; the particle size of the coarse particles II meets the following conditions: the granularity of more than 130 mu m is less than or equal to 3 mm; the particle size of the coarse particles III meets the following conditions: the granularity is more than 3mm and less than or equal to 5 mm.
Further, the preparation method also comprises the following steps:
preparing steel slag particles: the method comprises the following steps of (1) crushing a steel slag raw material after iron removal, and screening to obtain coarse particles I and fine particles I, wherein the granularity of the coarse particles I is larger than 10mm, and the granularity of the fine particles I is smaller than 5 mm; the coarse particles I are continuously crushed after iron removal to form closed cycle; after the fine particles I are subjected to powder selection by a powder selector, steel slag sand and fine particles II are formed, wherein the granularity of the steel slag sand is 3-10mm, and the granularity of the fine particles II is less than 3 mm; the fine particles II are the prepared steel slag particles.
Further, the preparation method also comprises the following steps:
the method comprises the following steps of carrying out iron removal pretreatment on slag, and/or carrying out drying and scattering pretreatment on gypsum, and/or carrying out drying pretreatment on coal-to-liquid coarse slag.
Further, in the preparation method, the dust collector generates damp and hot tail gas, the tail gas is introduced into the grinding device through a pipeline, particles are winnowed and then enter the dust collector to form circulation.
Further, the grinding device is a vertical mill.
In a specific implementation mode, the negative pressure inside the vertical mill is (-2500) Pa- (-2800) Pa, the pressure of the grinding roller is 10MPa to 12MPa, the rotation speed of a powder separator is 1050rpm to 1180rpm, the temperature of the wet and hot tail gas entering the vertical mill is 225 ℃ to 245 ℃, the pressure of an inlet of a dust collector is (-2950) Pa- (-3150) Pa, the temperature of an inlet of the dust collector is 70 ℃ to 85 ℃, the pressure of an outlet of the dust collector is (-3950) Pa- (-4250) Pa, the temperature of an outlet of the dust collector is 60 ℃ to 70 ℃, the pressure of the wet and hot tail gas in a circulating pipeline is (-580) Pa- (-630) Pa, and the thickness of a material layer is 8cm to 15 cm.
By adopting the parameters, the internal pressure and temperature of the vertical mill and the pressure and air volume of the dust collector are accurately controlled, so that the yield of the vertical mill is greatly improved, the design hourly yield is 45t/h, the actual hourly yield is 50t/h-60t/h, the yield of the production line is greatly increased, the energy consumption is effectively reduced, the power consumption of a comprehensive unit ton is less than or equal to 58 kW.h/t, and the gas consumption is less than or equal to 23m3/t。
Compared with the prior art, the invention has the following advantages:
(1) the cementing material provided by the invention effectively utilizes coal-to-liquid coarse slag and solid wastes such as steel slag, gypsum and the like, reduces the harm to the environment and changes waste into valuables.
(2) The cementing material provided by the invention utilizes Si and Al with higher content in the coal-to-liquid crude slag, is based on the four-coordination isomorphism effect and the double salt effect of silicon, and is cooperated with components in other raw materials, so that the cementing material has good stability and excellent mechanical properties.
(3) The preparation method provided by the invention has the advantages of simple process, easy operation and low energy consumption, and the gelled material with excellent performance is prepared by multi-link homogenization.
(4) In the preparation method, the steel slag raw material is not directly adopted to prepare the cementing material, but the steel slag raw material is subjected to circulating iron removal, crushing and screening, and the obtained steel slag particles are used for preparing the cementing material. The steel slag raw material has the characteristics of high hardness and difficult grinding, and the reason is that the steel slag contains hard-to-grind metallic iron particles. The steel slag raw material is crushed to expose part of large-particle metallic iron in advance, and then the exposed iron is effectively removed through an iron removal step, so that the cyclic load of subsequent crushing is reduced, and the grinding efficiency of subsequent grinding is improved. In addition, the steel slag sand produced in the step can be used as a raw material of building materials, and the whole preparation process is non-waste, non-pollution and efficient.
(5) In the preparation method, the circulating hot air is utilized for winnowing, so that the cementing materials can be effectively sorted, and can be uniformly mixed, and a mixing device is not required to be additionally arranged in a powder bin, so that the preparation method is more economical; the use of hot air improves the powder selection capability, the fineness and the specific surface area of the cementing material are stable, and the error is small; the hot air properly dries the moisture of the cementing material, so that the probability of hardening of the cementing material due to advanced hydration is reduced.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. In the drawings:
FIG. 1 is a schematic flow diagram of the preparation of a cementitious material;
FIG. 2 is an XRD analysis diagram of crude coal-to-liquids slag;
FIG. 3 is a thermal analysis diagram of coal-to-liquids coarse slag.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
The raw materials used in the examples of the present invention are commercially available from conventional sources, and the chemical compositions of some of the raw materials used in the examples of the present invention are listed below:
the coal-to-liquids coarse residue used in the examples of the present invention had the chemical composition shown in table 1. XRD analysis and thermal analysis are carried out on the coal-to-liquid crude slag, and the results are respectively shown in figures 2 and 3.
TABLE 1 analysis of chemical composition of raw material of crude residue of coal-to-liquids (%),
Figure BDA0002411511720000051
Figure BDA0002411511720000061
the water-quenched blast furnace slag, converter steel slag, and desulfurized gypsum used in the examples of the present invention had the chemical compositions shown in table 2.
TABLE 2 chemical composition analysis (%)
Figure BDA0002411511720000062
Example 1
(1) Preparation of steel slag particles
Feeding a converter steel slag raw material, carrying out pre-deironing by using a suspension type deironing device, feeding the steel slag subjected to pre-deironing into a roller press for primary crushing, then feeding the steel slag into a vibrating screen for screening, and producing coarse particles I and fine particles I after screening, wherein the granularity of the coarse particles I is more than 10mm, and the granularity of the fine particles I is less than 5 mm; the coarse particles I are returned to the roller press for continuous crushing after being deironized by a roller type deironing device, so that closed cycle is formed; and after the fine particles I are subjected to powder selection by a powder selector, steel slag sand and fine particles II are formed, wherein the granularity of the steel slag sand is 3mm, and the granularity of the fine particles II is 2 mm. The fine particles II are the prepared steel slag particles.
(2) Pretreatment of slag, gypsum and coal-to-liquid coarse slag
Respectively carrying out the following pretreatment on water quenching blast furnace slag, desulfurized gypsum and coal-to-liquid coarse slag:
feeding the water-quenched blast furnace slag raw material, and removing iron in advance by using a drum-type iron remover; drying and scattering the desulfurized gypsum; and drying the coal-to-liquid coarse slag.
(3) Preparation of cementitious Material
Weighing the steel slag particles prepared in the step (1), the slag obtained after pretreatment in the step (2), gypsum and crude slag of coal-to-liquid according to the following parts by weight: 5 parts of coal-made oil coarse slag, 50 parts of slag, 31 parts of steel slag particles and 14 parts of desulfurized gypsum; then conveying the mixture to a vertical mill through a belt conveyor for mixed grinding, grinding in a vertical mill system to obtain fine particles III (the particle size is more than 0 and less than or equal to 130 mu m), coarse particles II (the particle size is more than 130 mu m and less than or equal to 3mm) and coarse particles III (the particle size is more than 3mm and less than or equal to 5mm), air-separating the fine particles III, feeding the fine particles III into a dust collector, and returning the coarse particles II to a grinding disc of a grinding device for continuous grinding; and continuously grinding the coarse particles III through a grinding device after iron removal, thus forming a closed cycle until all raw materials enter a dust collector, and preparing the cementing material.
In the process, damp and hot tail gas generated after dust is collected by the dust collector returns to the vertical mill through a circulating pipeline, so that the damp and hot tail gas is recycled; controlling negative pressure-2600 Pa inside the vertical mill, pressure of the mill roll to be 11MPa, rotation speed of a powder separator to be 1010rpm, temperature of hot air entering the vertical mill to be 225 ℃, inlet pressure-3020 Pa of a dust collector, inlet temperature of the dust collector to be 70 ℃, outlet pressure-4050 Pa of the dust collector, outlet temperature of the dust collector to be 65 ℃, pressure-590 Pa in a damp and hot tail gas circulating pipeline, and thickness of a material layer to be 10.5 cm; the granularity of the returned material is 3mm-5 mm; the prepared cementing material has the specific surface area of 550m2Kg, particle size range of 0-130 μm, 0.045mm screen residue 1.5%, 0.080mm screen residue 0.3%, iron content of 1.0-2.0%.
Example 2
(1) Preparation of steel slag particles
Feeding a converter steel slag raw material, carrying out pre-deironing by using a suspension type deironing device, feeding the steel slag subjected to pre-deironing into a roller press for primary crushing, then feeding the steel slag into a vibrating screen for screening, and producing coarse particles I and fine particles I after screening, wherein the granularity of the coarse particles I is more than 10mm, and the granularity of the fine particles I is less than 5 mm; the coarse particles I are returned to the roller press for continuous crushing after being deironized by a roller type deironing device, so that closed cycle is formed; and after the fine particles I are subjected to powder selection by a powder selector, steel slag sand and fine particles II are formed, wherein the granularity of the steel slag sand is 3mm, and the granularity of the fine particles II is 2 mm. The fine particles II are the prepared steel slag particles.
(2) Pretreatment of slag, gypsum and coal-to-liquid coarse slag
Respectively carrying out the following pretreatment on water quenching blast furnace slag, desulfurized gypsum and coal-to-liquid coarse slag:
feeding the water-quenched blast furnace slag raw material, and removing iron in advance by using a drum-type iron remover; drying and scattering the desulfurized gypsum; and drying the coal-to-liquid coarse slag.
(3) Preparation of cementitious Material
Weighing the steel slag particles prepared in the step (1), the slag obtained after pretreatment in the step (2), gypsum and crude slag of coal-to-liquid according to the following parts by weight: 7 parts of coal-made oil coarse slag, 50 parts of slag, 29 parts of steel slag particles and 14 parts of desulfurized gypsum; then conveying the mixture to a vertical mill through a belt conveyor for mixed grinding, grinding in a vertical mill system to obtain fine particles III (the particle size is more than 0 and less than or equal to 130 mu m), coarse particles II (the particle size is more than 130 mu m and less than or equal to 3mm) and coarse particles III (the particle size is more than 3mm and less than or equal to 5mm), air-separating the fine particles III, feeding the fine particles III into a dust collector, and returning the coarse particles II to a grinding disc of a grinding device for continuous grinding; and continuously grinding the coarse particles III through a grinding device after iron removal, thus forming a closed cycle until all raw materials enter a dust collector, and preparing the cementing material.
In the process, damp and hot tail gas generated after dust is collected by the dust collector returns to the vertical mill through a circulating pipeline, so that the damp and hot tail gas is recycled; controlling negative pressure-2600 Pa inside the vertical mill, pressure of the mill roll to be 11MPa, rotation speed of a powder separator to be 1010rpm, temperature of hot air entering the vertical mill to be 225 ℃, inlet pressure-3020 Pa of a dust collector, inlet temperature of the dust collector to be 70 ℃, outlet pressure-4050 Pa of the dust collector, outlet temperature of the dust collector to be 65 ℃, pressure-590 Pa in a damp and hot tail gas circulating pipeline, and thickness of a material layer to be 10.5 cm; the granularity of the returned material is 3mm-5 mm; the prepared cementing material has the specific surface area of 550m2Kg, particle size range of 0-130 μm, 0.045mm screen residue 1.5%, 0.080mm screen residue 0.3%, iron content of 1.0-2.0%.
Example 3
(1) Preparation of steel slag particles
Feeding a converter steel slag raw material, carrying out pre-deironing by using a suspension type deironing device, feeding the steel slag subjected to pre-deironing into a roller press for primary crushing, then feeding the steel slag into a vibrating screen for screening, and producing coarse particles I and fine particles I after screening, wherein the granularity of the coarse particles I is more than 10mm, and the granularity of the fine particles I is less than 5 mm; the coarse particles I are returned to the roller press for continuous crushing after being deironized by a roller type deironing device, so that closed cycle is formed; and after the fine particles I are subjected to powder selection by a powder selector, steel slag sand and fine particles II are formed, wherein the granularity of the steel slag sand is 3mm, and the granularity of the fine particles II is 2 mm. The fine particles II are the prepared steel slag particles.
(2) Pretreatment of slag, gypsum and coal-to-liquid coarse slag
Respectively carrying out the following pretreatment on water quenching blast furnace slag, desulfurized gypsum and coal-to-liquid coarse slag:
feeding the water-quenched blast furnace slag raw material, and removing iron in advance by using a drum-type iron remover; drying and scattering the desulfurized gypsum; and drying the coal-to-liquid coarse slag.
(3) Preparation of cementitious Material
Weighing the steel slag particles prepared in the step (1), the slag obtained after pretreatment in the step (2), gypsum and crude slag of coal-to-liquid according to the following parts by weight: 10 parts of coal-made oil coarse slag, 48 parts of slag, 29 parts of steel slag particles and 13 parts of desulfurized gypsum; then conveying the mixture to a vertical mill through a belt conveyor for mixed grinding, grinding in a vertical mill system to obtain fine particles III (the particle size is more than 0 and less than or equal to 130 mu m), coarse particles II (the particle size is more than 130 mu m and less than or equal to 3mm) and coarse particles III (the particle size is more than 3mm and less than or equal to 5mm), air-separating the fine particles III, feeding the fine particles III into a dust collector, and returning the coarse particles II to a grinding disc of a grinding device for continuous grinding; and continuously grinding the coarse particles III through a grinding device after iron removal, thus forming a closed cycle until all raw materials enter a dust collector, and preparing the cementing material.
In the process, damp and hot tail gas generated after dust is collected by the dust collector returns to the vertical mill through a circulating pipeline, so that the damp and hot tail gas is recycled; controlling negative pressure-2650 Pa inside the vertical mill, pressure of the grinding roll 11MPa, rotation speed of a powder separator at 1010rpm, temperature of hot air entering the vertical mill at 225 ℃, pressure-3050 Pa at an inlet of a dust collector, temperature of 70 ℃ at an inlet of the dust collector, pressure-4050 Pa at an outlet of the dust collector, temperature of 65 ℃ at an outlet of the dust collector, pressure-590 Pa in a damp and hot tail gas circulating pipeline and thickness of a material layer at 10.5 cm; the granularity of the returned material is 3mm-5 mm; the prepared cementing material has the specific surface area of 600m2Kg, particle size of 0-130 μm, 0.045mm screen residue of 1.3%, 0.080mm screen residue of 0.1%, and iron content of 1.0-2.0％。
Example 4
(1) Preparation of steel slag particles
Feeding a converter steel slag raw material, carrying out pre-deironing by using a suspension type deironing device, feeding the steel slag subjected to pre-deironing into a roller press for primary crushing, then feeding the steel slag into a vibrating screen for screening, and producing coarse particles I and fine particles I after screening, wherein the granularity of the coarse particles I is more than 10mm, and the granularity of the fine particles I is less than 5 mm; the coarse particles I are returned to the roller press for continuous crushing after being deironized by a roller type deironing device, so that closed cycle is formed; and after the fine particles I are subjected to powder selection by a powder selector, steel slag sand and fine particles II are formed, wherein the granularity of the steel slag sand is 3mm, and the granularity of the fine particles II is 2 mm. The fine particles II are the prepared steel slag particles.
(2) Pretreatment of slag, gypsum and coal-to-liquid coarse slag
Respectively carrying out the following pretreatment on water quenching blast furnace slag, desulfurized gypsum and coal-to-liquid coarse slag:
feeding the water-quenched blast furnace slag raw material, and removing iron in advance by using a drum-type iron remover; drying and scattering the desulfurized gypsum; and drying the coal-to-liquid coarse slag.
(3) Preparation of cementitious Material
Weighing the steel slag particles prepared in the step (1), the slag obtained after pretreatment in the step (2), gypsum and crude slag of coal-to-liquid according to the following parts by weight: 13 parts of coal-made oil coarse slag, 42 parts of slag, 30 parts of steel slag particles and 15 parts of desulfurized gypsum; then conveying the mixture to a vertical mill through a belt conveyor for mixed grinding, grinding in a vertical mill system to obtain fine particles III (the particle size is more than 0 and less than or equal to 130 mu m), coarse particles II (the particle size is more than 130 mu m and less than or equal to 3mm) and coarse particles III (the particle size is more than 3mm and less than or equal to 5mm), air-separating the fine particles III, feeding the fine particles III into a dust collector, and returning the coarse particles II to a grinding disc of a grinding device for continuous grinding; and continuously grinding the coarse particles III through a grinding device after iron removal, thus forming a closed cycle until all raw materials enter a dust collector, and preparing the cementing material.
In the process, damp and hot tail gas generated after dust is collected by the dust collector returns to the vertical mill through a circulating pipeline, so that the damp and hot tail gas is recycled; controlNegative pressure in the vertical mill is-2650 Pa, pressure of the grinding roll is 11MPa, the rotating speed of a powder separator is 1010rpm, the temperature of hot air entering the vertical mill is 225 ℃, the pressure of an inlet of a dust collector is-3050 Pa, the temperature of an inlet of the dust collector is 70 ℃, the pressure of an outlet of the dust collector is-4050 Pa, the temperature of an outlet of the dust collector is 65 ℃, the pressure of a damp and hot tail gas circulating pipeline is-590 Pa, and the thickness of a material layer is 10.5 cm; the granularity of the returned material is 3mm-5 mm; the prepared cementing material has the specific surface area of 600m2Kg, particle size range of 0-130 μm, 0.045mm screen residue 1.3%, 0.080mm screen residue 0.1%, iron content of 1.0-2.0%.
Example 5
(1) Preparation of steel slag particles
Feeding a converter steel slag raw material, carrying out pre-deironing by using a suspension type deironing device, feeding the steel slag subjected to pre-deironing into a roller press for primary crushing, then feeding the steel slag into a vibrating screen for screening, and producing coarse particles I and fine particles I after screening, wherein the granularity of the coarse particles I is more than 15mm, and the granularity of the fine particles I is less than 10 mm; the coarse particles I are returned to the roller press for continuous crushing after being deironized by a roller type deironing device, so that closed cycle is formed; and after the fine particles I are subjected to powder selection by a powder selector, steel slag sand and fine particles II are formed, wherein the granularity of the steel slag sand is 5mm, and the granularity of the fine particles II is 2.8 mm. The fine particles II are the prepared steel slag particles.
(2) Pretreatment of slag, gypsum and coal-to-liquid coarse slag
Respectively carrying out the following pretreatment on water quenching blast furnace slag, desulfurized gypsum and coal-to-liquid coarse slag:
feeding the water-quenched blast furnace slag raw material, and removing iron in advance by using a drum-type iron remover; drying and scattering the lemon gypsum; and drying the coal-to-liquid coarse slag.
(3) Preparation of cementitious Material
Weighing the steel slag particles prepared in the step (1), the slag obtained after pretreatment in the step (2), gypsum and crude slag of coal-to-liquid according to the following parts by weight: 20 parts of coal-made oil coarse slag, 39 parts of slag, 28 parts of steel slag particles and 13 parts of desulfurized gypsum; then conveying the mixture to a vertical mill through a belt conveyor for mixed grinding, grinding in a vertical mill system to obtain fine particles III (the particle size is more than 0 and less than or equal to 130 mu m), coarse particles II (the particle size is more than 130 mu m and less than or equal to 3mm) and coarse particles III (the particle size is more than 3mm and less than or equal to 5mm), air-separating the fine particles III, feeding the fine particles III into a dust collector, and returning the coarse particles II to a grinding disc of a grinding device for continuous grinding; and continuously grinding the coarse particles III through a grinding device after iron removal, thus forming a closed cycle until all raw materials enter a dust collector, and preparing the cementing material.
In the process, damp and hot tail gas generated after dust is collected by the dust collector returns to the vertical mill through a circulating pipeline, so that the damp and hot tail gas is recycled; controlling negative pressure-2730 Pa inside the vertical mill, pressure of the grinding roll to be 9.7MPa, rotating speed of a powder separator to be 1080rpm, temperature of hot air entering the vertical mill to be 225 ℃, pressure-3080 Pa at an inlet of a dust collector, temperature of 75 ℃ at an inlet of the dust collector, pressure-4080 Pa at an outlet of the dust collector, temperature of 65 ℃ at an outlet of the dust collector, pressure-595 Pa in a damp and hot tail gas circulating pipeline, and thickness of a material layer to be 10.9 cm; the granularity of the returned material is 3mm-5 mm; the specific surface area of the prepared gelled material is 450m2Kg, particle size range of 0-130 μm, 0.045mm screen residue 1.8%, 0.080mm screen residue 0.5%, iron content of 1.0-2.0%.
Comparative example 1
Taking desulfurized gypsum, a converter steel slag raw material and a blast furnace water-quenched slag raw material, and weighing the following components in percentage by mass: 65% of slag, 25% of steel slag particles and 10% of gypsum. Conveying the raw materials to a vertical mill through a belt conveyor for mixing and grinding, then selecting the powder in a powder selecting machine, and controlling the specific surface area of the cementing material to be 600m2Kg, particle size range of 0-130 μm, 0.045mm screen residue 1.8%, 0.080mm screen residue 0.5%.
The gelled materials prepared in the examples 1-5 and the comparative example 1 are respectively prepared into a gelled sand test block according to the water-to-gel ratio of 0.32, the dosage of the water reducing agent is based on the flowability of the gelled sand of 180-220mm, and the gelled material stability test is carried out according to GB/T1346-2011 'inspection method for water consumption, setting time and stability of standard consistency of cement'. The stability test adopts two methods of a test cake method and a Rayleigh method for detection, and the stability meets the national standard. Table 3 shows the comparison table of the parameters of each test result
Table 3 mortar test block strength comparison table
Figure BDA0002411511720000111
As can be seen from the above table, the stability of the cementing material prepared by the invention meets the national standard, and can reach the standard of 42.5 cement, and the cementing material has excellent mechanical properties. By contrast, when the mixing amount of the coal-made oil slag is close to 20%, the prepared mortar test block still has higher compressive strength and flexural strength, and by utilizing the characteristic that the content of Al and Si in the coal-made oil coarse slag is high, the mortar test block can generate good gelation effect on the basis of the four-coordination isomorphism effect and the double salt effect of silicon and by cooperating with other components, the early strength and the later strength can be improved within a certain range, and the mortar test block can be used as a green building material; because the easy grindability of the coal-made oil slag is better than that of the slag, the efficiency of grinding can be improved and the energy consumption can be reduced in the grinding process of the cementing material; the cost of the crude slag of the coal-based oil is close to zero, and the crude slag can replace the slag to the same extent under the market condition that the price of the slag is high all the way, thereby being beneficial to reducing the production cost.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.

Claims (7)

1. The cementing material containing the coal-to-liquid coarse slag is characterized by comprising the following raw materials in parts by weight: 3-30 parts of coal-made oil coarse slag, 20-60 parts of slag, 10-40 parts of steel slag particles and 5-20 parts of gypsum;
the steel slag particles are obtained by removing iron, crushing and screening from a steel slag raw material; the preparation method of the steel slag particles comprises the following steps: the steel slag raw material is subjected to iron removal, then is crushed and is screened to obtain coarse particles I and fine particles I, wherein the granularity of the coarse particles I is larger than 10mm, and the granularity of the fine particles I is smaller than 10 mm; the coarse particles I are subjected to iron removal and then are crushed continuously to form closed cycle; after the fine particles I are subjected to powder selection by a powder selector, steel slag sand and fine particles II are formed, wherein the granularity of the steel slag sand is 3-10mm, and the granularity of the fine particles II is less than 3 mm; the fine particles II are the prepared steel slag particles;
the specific surface area of the cementing material is 450m2/kg -600m2Per kg; the preparation method of the cementing material comprises the following steps: weighing coal-made oil coarse slag, steel slag particles and gypsum according to specified weight parts, mixing the raw materials, and then grinding the mixture by using a vertical mill to obtain fine particles III, coarse particles II and coarse particles III, winnowing the fine particles III, feeding the fine particles III into a dust collector, and returning the coarse particles II to a grinding disc of the vertical mill for continuous grinding; after iron is removed, the coarse particles III are continuously ground by a vertical mill, circulation is formed in this way until all raw materials enter a dust collector, and the cementing material is obtained;
wherein the particle size of the fine particles III satisfies the following condition: the granularity is more than 0 and less than or equal to 130 mu m; the particle size of the coarse particles II meets the following conditions: the granularity of more than 130 mu m is less than or equal to 3 mm; the particle size of the coarse particles III meets the following conditions: the granularity is more than 3mm and less than or equal to 5 mm.
2. The cementitious material of claim 1, wherein the steel slag raw material is one or more of converter steel slag, hot splashing steel slag, hot smoldering steel slag, roller steel slag and electric furnace slag.
3. The cementitious material of claim 1, wherein the steel slag particles have a particle size of less than 3 mm.
4. The cementitious material of claim 1, wherein the gypsum is one or more of desulfurized gypsum, phosphogypsum, fluorgypsum, lemon gypsum, and waste ceramic mold gypsum; the slag is water quenched blast furnace slag.
5. The cementitious material of claim 1, wherein the particle size satisfies the following condition: the granularity is more than 0 and less than or equal to 130 mu m; 0.045mm screen residue 1.0-5.0%, 0.080mm screen residue 0-3.0%, and iron content 0.5-2.0%.
6. A method for preparing a cementitious material as claimed in any one of claims 1 to 5, characterised in that it comprises the steps of:
weighing coal-made oil coarse slag, steel slag particles and gypsum according to specified weight parts, mixing the raw materials, and then grinding the mixture by using a vertical mill to obtain fine particles III, coarse particles II and coarse particles III, winnowing the fine particles III, feeding the fine particles III into a dust collector, and returning the coarse particles II to a grinding disc of the vertical mill for continuous grinding; after iron is removed, the coarse particles III are continuously ground by a vertical mill, circulation is formed in this way until all raw materials enter a dust collector, and the cementing material is obtained;
wherein the particle size of the fine particles III satisfies the following condition: the granularity is more than 0 and less than or equal to 130 mu m; the particle size of the coarse particles II meets the following conditions: the granularity of more than 130 mu m is less than or equal to 3 mm; the particle size of the coarse particles III meets the following conditions: the granularity is more than 3mm and less than or equal to 5 mm;
the dust collector generates damp and hot tail gas, the tail gas is introduced into the vertical mill through a pipeline, particles are winnowed and then enter the dust collector to form air circulation; the negative pressure inside the vertical mill is (-2500) Pa- (-2800) Pa, the pressure of the grinding roll is 10MPa-12MPa, the rotating speed of a powder separator is 1050-1180 rpm, the temperature of the damp and hot tail gas entering the vertical mill is 225-245 ℃, the pressure of an inlet of a dust collector is (-2950) Pa- (-3150) Pa, the temperature of an inlet of the dust collector is 70-85 ℃, the pressure of an outlet of the dust collector is (-3950) Pa- (-4250) Pa, the temperature of an outlet of the dust collector is 60-70 ℃, the pressure of a circulation pipeline of the damp and hot tail gas is (-580) Pa- (-630) Pa, and the thickness of a material layer is 8cm-15 cm.
7. The method of claim 6, further comprising the steps of:
the method comprises the following steps of carrying out iron removal pretreatment on slag, and/or carrying out drying and scattering pretreatment on gypsum, and/or carrying out drying pretreatment on coal-to-liquid coarse slag.
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