CN111003982A - Ultrafine silica sand tailing powder autoclaved aerated concrete and preparation method thereof - Google Patents
Ultrafine silica sand tailing powder autoclaved aerated concrete and preparation method thereof Download PDFInfo
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- CN111003982A CN111003982A CN201911315561.XA CN201911315561A CN111003982A CN 111003982 A CN111003982 A CN 111003982A CN 201911315561 A CN201911315561 A CN 201911315561A CN 111003982 A CN111003982 A CN 111003982A
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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
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
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Abstract
The invention relates to the field of aerated concrete raw materials, in particular to ultrafine silica sand tailing powder autoclaved aerated concrete and a preparation method thereof; the ultrafine silica sand tailing powder autoclaved aerated concrete comprises: 180-mesh ultrafine silica sand tailing powder with the balance of less than 3 percent; the preparation method comprises the following steps: wet grinding superfine silica sand tailing powder, river sand and aerated concrete crushing waste to prepare slurry, mixing the slurry with quicklime, cement and desulfurized gypsum, and proportioning and pouring. The superfine silica sand tailing powder autoclaved aerated concrete prepared by the preparation method of the superfine silica sand tailing powder autoclaved aerated concrete has the advantages of full chemical reaction, difficulty in generating surface powder, good strength and difficulty in cracking products.
Description
Technical Field
The invention relates to the field of aerated concrete raw materials, in particular to ultrafine silica sand tailing powder autoclaved aerated concrete and a preparation method thereof.
Background
The existing production of the autoclaved aerated concrete can utilize a large amount of industrial wastes, so that the utilization value of the wastes can be improved.
The autoclaved aerated concrete product provided by the related technology is easy to generate powder on the surface layer, insufficient in chemical reaction, low in strength and easy to crack.
Disclosure of Invention
The invention aims to provide the ultrafine silica sand tailing powder autoclaved aerated concrete and the preparation method thereof.
The invention is realized by the following steps:
in a first aspect, an embodiment provides an ultrafine silica sand tailing powder autoclaved aerated concrete, which includes: 180 mesh sieve, and the rest is superfine silica sand tailing powder with the content of less than 3 percent.
In an optional embodiment, the composition comprises the following components in percentage by weight: 50-70% of superfine silica sand tailing powder, 0-20% of river sand, 0-5% of aerated concrete crushed waste, 8-15% of quicklime, 10-18% of cement and 2-8% of desulfurized gypsum.
In an alternative embodiment, the silica content of the superfine silica sand tailings powder is 85-99% of its total weight.
In an alternative embodiment, the silicon content of the river sand is 80-90% of its total amount.
In an alternative embodiment, the balance of the river sand 180 mesh screen is 20-25%.
In an alternative embodiment, the activated calcium oxide in the quicklime is 65-75% of its total weight.
In an alternative embodiment, the slaking temperature of the quicklime is 70-85 ℃.
In a second aspect, an embodiment provides a preparation method of the ultrafine silica sand tailing powder autoclaved aerated concrete, which includes: the superfine silica sand tailing powder, river sand and aerated concrete crushing waste are wet-milled to prepare slurry, quicklime, cement, desulfurized gypsum and aluminum powder are mixed into the slurry, and the mixture is stirred and poured.
In an alternative embodiment, after the batch casting, the method further comprises: static curing, cutting and steam pressure curing.
In an alternative embodiment, the temperature of the static curing is 50-60 ℃, and the pressure of the autoclave curing is 1.15-1.25 MPa.
The beneficial effects of the ultrafine silica sand tailing powder autoclaved aerated concrete of the embodiment of the invention comprise: the raw materials of the superfine silica sand tailing powder autoclaved aerated concrete provided by the embodiment of the invention comprise superfine silica sand tailing powder with 180-mesh sieve and the balance of less than 3 percent; therefore, the strength of the superfine silica sand tailing powder autoclaved aerated concrete can be improved, the chemical reaction is sufficient, the powder generated on the surface of a finished product is reduced, and the product is not easy to crack.
The preparation method of the superfine silica sand tailing powder autoclaved aerated concrete provided by the embodiment of the invention has the beneficial effects that: the raw materials in the preparation method of the superfine silica sand tailing powder autoclaved aerated concrete provided by the embodiment of the invention comprise superfine silica sand tailing powder with 180-mesh sieve and the balance of less than 3 percent; the strength of the ultrafine silica sand tailing powder autoclaved aerated concrete can be improved, the chemical reaction is sufficient, the powder generated in the finished product is reduced, and the product is not easy to crack.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
The ultrafine silica sand tailing powder autoclaved aerated concrete and the preparation method thereof are further described in detail below.
The invention provides ultrafine silica sand tailing powder autoclaved aerated concrete, which comprises the raw materials of ultrafine silica sand tailing powder with 180-mesh sieve and the balance of less than 3%.
According to the ultrafine silica sand tailing powder autoclaved aerated concrete, the ultrafine silica sand tailing powder is controlled to be 180-mesh, and the balance is below 3%, so that the internal chemical reaction of the aerated concrete is facilitated to be sufficient, and the autoclaved aerated concrete with certain strength is formed; and further, the powder produced by the finished product can be reduced, so that the product is not easy to crack, and the mixing amount of the tailing sand is greatly increased.
The inventor researches and discovers that the screen allowance of the autoclaved aerated concrete provided by the related technology after ball milling is about 15-20%, coarse particles are easy to precipitate in the pouring process, and the aerated concrete is layered up and down to influence the overall strength of the product. It should be noted that, in the invention, the control of the superfine silica sand tailing powder to be below 3% of the balance of the 180-mesh sieve means that the balance of the superfine silica sand tailing powder is less than or equal to 3% of the balance of the 180-mesh sieve.
The raw materials of the superfine silica sand tailing powder autoclaved aerated concrete comprise, by weight, 50-70% of superfine silica sand tailing powder, 0-20% of river sand, 0-5% of aerated concrete crushing waste, 8-15% of quicklime, 10-18% of cement and 2-8% of desulfurized gypsum.
According to the superfine silica sand tailing powder autoclaved aerated concrete, the internal reaction of the original aerated concrete is promoted to be sufficient through the proportion of the use amount of each raw material component, the strength of the prepared superfine silica sand tailing powder autoclaved aerated concrete is improved, the surface powder generated by a finished product is reduced, and the product is not easy to crack.
The ultrafine silica sand tailing powder is added with river sand and aerated concrete crushing waste in the autoclaved aerated concrete, so that the waste can be fully utilized, and the strength of the product can be improved by utilizing the river sand and the aerated concrete crushing waste.
In the invention, the silicon content in the superfine silica sand tailing powder accounts for 85-99 percent of the total weight of the superfine silica sand tailing powder, namely the SiO in the superfine silica sand tailing powder285-99% by weight of Al2O3、Fe2O3And CaO and the like.
The silicon content in the superfine silica sand tailing powder is controlled to be higher, silicon dioxide can be fully utilized, the strength and hardness of the prepared superfine silica sand tailing powder autoclaved aerated concrete are improved, powder generated in finished products is reduced, and the products are not easy to crack.
In the invention, the silicon content in the river sand accounts for 80-90% of the total amount of the river sand; i.e. SiO in river sand2Is 80-90 wt%, and the rest may be Al2O3、Fe2O3And CaO and the like, which are not particularly limited herein; wherein the mud content is less than 3%. River sand can be used as the aggregate of the ultrafine silica sand tailing powder autoclaved aerated concrete, so that the strength of the ultrafine silica sand tailing powder autoclaved aerated concrete is further ensured, and cracking of a finished product is avoided.
Furthermore, the balance of the river sand 180-mesh sieve is 20-25%. Furthermore, river sand is coarse sand, and the balance of the 180-mesh sieve obtained after ball milling treatment is 20-25%.
In the invention, the percentage of active calcium oxide in the quicklime accounts for 65-75% of the total amount of the quicklime; namely, the weight percentage of calcium oxide in the lime is 65-75 percent, and the content of magnesium oxide is less than 3 percent; the remainder may be alumina or the like.
Furthermore, the slaking temperature of the quicklime is 70-85 ℃.
Still further, the quick lime in the invention can be medium-speed lime with digestion time of 8-15 min.
The cement used in the present invention may be, for example: P.O 42.5 cement or P.II 42.5 cement; the desulfurized gypsum is desulfurized gypsum of a thermal power plant.
The water-material ratio of the ultrafine silica sand tailing powder autoclaved aerated concrete soil can be 0.55-0.6.
The invention also provides a preparation method of the superfine silica sand tailing powder autoclaved aerated concrete, which comprises the raw materials.
The method of the invention comprises the following steps: wet grinding superfine silica sand tailing powder, river sand and aerated concrete crushing waste to prepare slurry, mixing quicklime, cement, desulfurized gypsum and aluminum powder into the slurry, and mixing, stirring and pouring.
Specifically, the weight percentage of the aluminum powder to the total weight of the superfine silica sand tailing powder, river sand, aerated concrete crushed waste, quicklime and desulfurized gypsum is approximately 0.08-0.12%.
Specifically, after superfine silica sand tailing powder, river sand and aerated concrete crushing waste are mixed according to the weight ratio, wet grinding and pulping are carried out by a ball mill, and the specific gravity of slurry is 1.65-1.7.
Mixing quicklime, cement and desulfurized gypsum into the slurry prepared in the step according to the weight ratio, and then pouring; wherein the specific gravity of the prepared mixed slurry of the new slurry and the waste slurry is 1.55-1.6, and the casting temperature is 42-45 ℃.
The preparation method of the invention also comprises the following steps: after the materials are mixed and poured, static curing, cutting and steam pressure curing are carried out.
The temperature of the static curing is 50-60 ℃, and the pressure of the steam pressure curing is 1.15-1.25 MPa.
Further, during the steam pressure curing, the pressure is maintained for 8-12h under the condition of constant pressure.
The following describes the ultrafine silica sand tailing powder autoclaved aerated concrete and the preparation method thereof in detail with reference to the examples.
Example 1
The ingredients according to the weight percentage comprise: 50% of superfine silica sand tailing powder, 15% of river sand, 3% of aerated concrete crushed waste, 13% of quicklime, 15% of cement and 4% of desulfurized gypsum.
Wherein the balance of the superfine silica sand tailing powder with a 180-mesh sieve is less than 3 percent, and the content of silicon in the superfine silica sand tailing powder accounts for 85 percent of the total weight of the superfine silica sand tailing powder.
The silicon content in the river sand accounts for 90 percent of the total amount of the river sand, and the balance of the river sand with a 180-mesh sieve is 20 percent.
The active calcium oxide in the quicklime accounts for 65 percent of the total amount of the quicklime, the digestion temperature of the quicklime is 70 ℃, and the quicklime is medium-speed lime with the digestion time of 8 min.
The cement is P.O 42.5 cement.
After the superfine silica sand tailing powder, river sand and aerated concrete crushing waste are mixed according to the weight ratio, wet grinding and pulping are carried out by a ball mill, and the specific gravity of slurry is 1.65.
Mixing the quicklime, the cement, the desulfurized gypsum and the aluminum powder into the slurry prepared in the step according to the weight ratio, and then pouring; wherein the specific gravity of the prepared mixed slurry of the new slurry and the waste slurry is 1.55; wherein the weight percentage of the aluminum powder to the total weight of the superfine silica sand tailing powder, the river sand, the aerated concrete crushed waste, the quick lime and the desulfurized gypsum is 0.08 percent.
Pouring at 42 ℃, statically curing at 50 ℃, cutting, and performing autoclaved curing, wherein the autoclaved curing pressure is 1.15MPa, and the curing time is 12 h. The water-material ratio of the prepared superfine silica sand tailing powder autoclaved aerated concrete is 0.6.
Example 2
The ingredients according to the weight percentage comprise: 70% of superfine silica sand tailing powder, 3% of river sand, 5% of aerated concrete crushed waste, 8% of quicklime, 12% of cement and 2% of desulfurized gypsum.
Wherein the balance of the superfine silica sand tailing powder with a 180-mesh sieve is equal to 3 percent, and the content of silicon in the superfine silica sand tailing powder accounts for 99 percent of the total weight of the superfine silica sand tailing powder.
The silicon content in the river sand accounts for 80 percent of the total amount of the river sand, and the balance of the river sand with a 180-mesh sieve is 25 percent.
The active calcium oxide in the quicklime accounts for 75 percent of the total amount of the quicklime, the digestion temperature of the quicklime is 85 ℃, and the quicklime is medium-speed lime with the digestion time of 15 min.
The cement is P.II 42.5 cement.
And (3) mixing the superfine silica sand tailing powder, river sand and the aerated concrete crushing waste material according to the weight ratio, and performing wet grinding and pulping by using a ball mill, wherein the specific gravity of the slurry is 1.7.
Mixing the quicklime, the cement, the desulfurized gypsum and the aluminum powder into the slurry prepared in the step according to the weight ratio, and then pouring; wherein the specific gravity of the prepared mixed slurry of the new slurry and the waste slurry is 1.6; wherein the weight percentage of the aluminum powder to the total weight of the superfine silica sand tailing powder, the river sand, the aerated concrete crushed waste, the quicklime and the desulfurized gypsum is 0.12 percent.
Pouring at 45 ℃, statically curing at 60 ℃, cutting, and performing autoclaved curing, wherein the autoclaved curing pressure is 1.25MPa, and the curing time is 8 h. The water-material ratio of the prepared superfine silica sand tailing powder autoclaved aerated concrete is 0.58.
Example 3
The ingredients according to the weight percentage comprise: 65% of superfine silica sand tailing powder, 6% of river sand, 4% of aerated concrete crushed waste, 9% of quicklime, 10% of cement and 6% of desulfurized gypsum.
Wherein the balance of the superfine silica sand tailing powder with a 180-mesh sieve is equal to 2.5 percent, and the silicon content in the superfine silica sand tailing powder accounts for 90 percent of the total weight of the superfine silica sand tailing powder.
The silicon content in the river sand accounts for 85 percent of the total weight of the river sand, and the balance of the river sand with a 180-mesh sieve is 22 percent.
The active calcium oxide in the quicklime accounts for 70 percent of the total amount of the quicklime, the digestion temperature of the quicklime is 80 ℃, and the quicklime is medium-speed lime with the digestion time of 10 min.
The cement is P.O 42.5 cement.
After the superfine silica sand tailing powder, river sand and aerated concrete crushing waste are mixed according to the weight ratio, wet grinding and pulping are carried out by a ball mill, and the specific gravity of slurry is 1.68.
Mixing the quicklime, the cement, the desulfurized gypsum and the aluminum powder into the slurry prepared in the step according to the weight ratio, and then pouring; wherein the specific gravity of the prepared mixed slurry of the new slurry and the waste slurry is 1.58; wherein the weight percentage of the aluminum powder to the total weight of the superfine silica sand tailing powder, the river sand, the aerated concrete crushed waste, the quicklime and the desulfurized gypsum is 0.1 percent.
Pouring at 43 ℃, statically curing at 52 ℃, cutting, and performing autoclaved curing, wherein the autoclaved curing pressure is 1.2MPa, and the curing time is 10 h. The water-material ratio of the prepared superfine silica sand tailing powder autoclaved aerated concrete is 0.55.
Example 4
The ingredients according to the weight percentage comprise: 52% of superfine silica sand tailing powder, 12% of river sand, 2% of aerated concrete crushed waste, 15% of quicklime, 11% of cement and 8% of desulfurized gypsum.
Wherein the balance of the superfine silica sand tailing powder with a 180-mesh sieve is less than 3 percent, and the content of silicon in the superfine silica sand tailing powder accounts for 88 percent of the total weight of the superfine silica sand tailing powder.
The silicon content in the river sand accounts for 88 percent of the total amount of the river sand, and the balance of the river sand with a 180-mesh sieve is 23 percent.
The active calcium oxide in the quicklime accounts for 68 percent of the total amount of the quicklime, the digestion temperature of the quicklime is 78 ℃, and the quicklime is medium-speed lime with the digestion time of 9 min.
The cement is P.II 42.5 cement.
And (3) mixing the superfine silica sand tailing powder, river sand and the aerated concrete crushing waste material according to the weight ratio, and performing wet grinding and pulping by using a ball mill, wherein the specific gravity of the slurry is 1.7.
Mixing the quicklime, the cement, the desulfurized gypsum and the aluminum powder into the slurry prepared in the step according to the weight ratio, and then pouring; wherein the specific gravity of the prepared mixed slurry of the new slurry and the waste slurry is 1.55; wherein the weight percentage of the aluminum powder to the total weight of the superfine silica sand tailing powder, the river sand, the aerated concrete crushed waste, the quicklime and the desulfurized gypsum is 0.11 percent.
Pouring at 42 ℃, statically curing at 56 ℃, cutting, and performing autoclaved curing, wherein the autoclaved curing pressure is 1.15MPa, and the curing time is 12 h. The water-material ratio of the prepared superfine silica sand tailing powder autoclaved aerated concrete is 0.6.
Example 5
The ingredients according to the weight percentage comprise: 51% of superfine silica sand tailing powder, 14% of river sand, 4% of aerated concrete crushed waste, 11% of quicklime, 18% of cement and 2% of desulfurized gypsum.
Wherein the balance of the superfine silica sand tailing powder with a 180-mesh sieve is less than 3 percent, and the content of silicon in the superfine silica sand tailing powder accounts for 97 percent of the total weight of the superfine silica sand tailing powder.
The silicon content in the river sand accounts for 84 percent of the total weight of the river sand, and the balance of the river sand with a 180-mesh sieve is 21 percent.
The active calcium oxide in the quicklime accounts for 65 percent of the total amount of the quicklime, the digestion temperature of the quicklime is 70 ℃, and the quicklime is medium-speed lime with the digestion time of 8 min.
The cement is P.O 42.5 cement.
And (3) mixing the superfine silica sand tailing powder, river sand and the aerated concrete crushing waste material according to the weight ratio, and performing wet grinding and pulping by using a ball mill, wherein the specific gravity of the slurry is 1.7.
Mixing the quicklime, the cement, the desulfurized gypsum and the aluminum powder into the slurry prepared in the step according to the weight ratio, and then pouring; wherein the specific gravity of the prepared mixed slurry of the new slurry and the waste slurry is 1.6; wherein the weight percentage of the aluminum powder to the total weight of the superfine silica sand tailing powder, the river sand, the aerated concrete crushed waste, the quick lime and the desulfurized gypsum is 0.09 percent.
Pouring at 42 ℃, statically curing at 50 ℃, cutting, and performing autoclaved curing, wherein the autoclaved curing pressure is 1.15MPa, and the curing time is 10 h. The water-material ratio of the prepared superfine silica sand tailing powder autoclaved aerated concrete is 0.6.
Example 6
The ingredients according to the weight percentage comprise: 58% of superfine silica sand tailing powder, 1% of river sand, 3% of aerated concrete crushed waste, 14% of quicklime, 17% of cement and 7% of desulfurized gypsum.
Wherein the balance of the superfine silica sand tailing powder with a 180-mesh sieve is equal to 2 percent, and the content of silicon in the superfine silica sand tailing powder accounts for 85 percent of the total weight of the superfine silica sand tailing powder.
The silicon content in the river sand accounts for 86 percent of the total amount of the river sand, and the balance of the river sand with a 180-mesh sieve is 24 percent.
The active calcium oxide in the quicklime accounts for 65 percent of the total amount of the quicklime, the digestion temperature of the quicklime is 70 ℃, and the quicklime is medium-speed lime with the digestion time of 8 min.
The cement is P.O 42.5 cement.
And (3) mixing the superfine silica sand tailing powder, river sand and the aerated concrete crushing waste material according to the weight ratio, and performing wet grinding and pulping by using a ball mill, wherein the specific gravity of the slurry is 1.7.
Mixing the quicklime, the cement, the desulfurized gypsum and the aluminum powder into the slurry prepared in the step according to the weight ratio, and then pouring; wherein the specific gravity of the prepared mixed slurry of the new slurry and the waste slurry is 1.55; wherein the weight percentage of the aluminum powder to the total weight of the superfine silica sand tailing powder, the river sand, the aerated concrete crushed waste, the quick lime and the desulfurized gypsum is 0.08 percent.
Pouring at 44 ℃, standing at 55 ℃, cutting, and performing autoclaved curing, wherein the autoclaved curing pressure is 1.25MPa, and the curing time is 12 h. The water-material ratio of the prepared superfine silica sand tailing powder autoclaved aerated concrete is 0.55.
Example 7
The ingredients according to the weight percentage comprise: 59% of superfine silica sand tailing powder, 9% of river sand, 1% of aerated concrete crushed waste, 12% of quicklime, 14% of cement and 5% of desulfurized gypsum.
Wherein the balance of the superfine silica sand tailing powder with a 180-mesh sieve is less than 3 percent, and the content of silicon in the superfine silica sand tailing powder accounts for 95 percent of the total weight of the superfine silica sand tailing powder.
The silicon content in the river sand accounts for 90 percent of the total amount of the river sand, and the balance of the river sand with a 180-mesh sieve is 22 percent.
The active calcium oxide in the quicklime accounts for 65 percent of the total amount of the quicklime, the digestion temperature of the quicklime is 77 ℃, and the quicklime is medium-speed lime with the digestion time of 9 min.
The cement is P.O 42.5 cement.
After the superfine silica sand tailing powder, river sand and aerated concrete crushing waste are mixed according to the weight ratio, wet grinding and pulping are carried out by a ball mill, and the specific gravity of slurry is 1.65.
Mixing the quicklime, the cement, the desulfurized gypsum and the aluminum powder into the slurry prepared in the step according to the weight ratio, and then pouring; wherein the specific gravity of the prepared mixed slurry of the new slurry and the waste slurry is 1.6; wherein the weight percentage of the aluminum powder to the total weight of the superfine silica sand tailing powder, the river sand, the aerated concrete crushed waste, the quicklime and the desulfurized gypsum is 0.11 percent.
Pouring at 43 ℃, standing at 53 ℃, cutting, and performing autoclaved curing, wherein the pressure of the autoclaved curing is 1.2MPa, and the curing time is 12 h. The water-material ratio of the prepared superfine silica sand tailing powder autoclaved aerated concrete is 0.55.
Example 8
The ingredients according to the weight percentage comprise: 50% of superfine silica sand tailing powder, 20% of river sand, 12% of quicklime, 15% of cement and 3% of desulfurized gypsum.
Wherein the balance of the superfine silica sand tailing powder with a 180-mesh sieve is less than 3 percent, and the content of silicon in the superfine silica sand tailing powder accounts for 85 percent of the total weight of the superfine silica sand tailing powder.
The silicon content in the river sand accounts for 90 percent of the total amount of the river sand, and the balance of the river sand with a 180-mesh sieve is 20 percent.
The active calcium oxide in the quicklime accounts for 65 percent of the total amount of the quicklime, the digestion temperature of the quicklime is 70 ℃, and the quicklime is medium-speed lime with the digestion time of 8 min.
The cement is P.O 42.5 cement.
After the superfine silica sand tailing powder and river sand are mixed according to the weight ratio, wet grinding and pulping are carried out by a ball mill, and the specific gravity of slurry is 1.65.
Mixing the quicklime, the cement, the desulfurized gypsum and the aluminum powder into the slurry prepared in the step according to the weight ratio, and then pouring; wherein the specific gravity of the prepared mixed slurry of the new slurry and the waste slurry is 1.55; wherein the weight percentage of the aluminum powder to the total weight of the superfine silica sand tailing powder, the river sand, the quicklime and the desulfurized gypsum is 0.08 percent.
Pouring at 42 ℃, statically curing at 50 ℃, cutting, and performing autoclaved curing, wherein the autoclaved curing pressure is 1.15MPa, and the curing time is 12 h. The water-material ratio of the prepared superfine silica sand tailing powder autoclaved aerated concrete is 0.6.
Performing 15 repeated experiments according to the preparation method provided in embodiment 8, and testing the pot discharging strength (MPa), the pot discharging capacity and the drying strength (MPa) of each experiment group, wherein the testing method is similar to that of the related art and is not repeated herein; the results of the experiments are shown in the following table.
According to the table 1, the superfine silica sand tailing powder autoclaved aerated concrete prepared by the preparation method provided by the invention has good strength.
In summary, the raw materials of the ultrafine silica sand tailing powder autoclaved aerated concrete provided by the embodiment of the invention comprise ultrafine silica sand tailing powder with 180-mesh sieve and the balance of less than 3%; therefore, the strength of the superfine silica sand tailing powder autoclaved aerated concrete can be improved, the chemical reaction is sufficient, the powder generated by the finished product is reduced, and the product is not easy to crack.
The raw materials in the preparation method of the superfine silica sand tailing powder autoclaved aerated concrete provided by the embodiment of the invention comprise superfine silica sand tailing powder with 180-mesh sieve and the balance of less than 3 percent; the strength of the ultrafine silica sand tailing powder autoclaved aerated concrete can be improved, the powder produced by the finished product is reduced, and the product is not easy to crack.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The ultrafine silica sand tailing powder autoclaved aerated concrete is characterized by comprising the following components: 180 mesh sieve, and the rest is superfine silica sand tailing powder with the content of less than 3 percent.
2. The ultrafine silica sand tailing powder autoclaved aerated concrete according to claim 1, which comprises the following components in percentage by weight: 50-70% of the superfine silica sand tailing powder, 0-20% of river sand, 0-5% of aerated concrete crushed waste, 8-15% of quicklime, 10-18% of cement and 2-8% of desulfurized gypsum.
3. The ultrafine silica sand tailing powder autoclaved aerated concrete according to claim 2, wherein the content of silicon in the ultrafine silica sand tailing powder accounts for 85-99% of the total content of the ultrafine silica sand tailing powder.
4. The ultrafine silica sand tailing powder autoclaved aerated concrete according to claim 2, wherein the content of silicon in the river sand accounts for 80-90% of the total amount of the river sand.
5. The ultrafine silica sand tailing powder autoclaved aerated concrete according to claim 2, wherein the balance of the river sand 180-mesh sieve is 20-25%.
6. The ultrafine silica sand tailing powder autoclaved aerated concrete according to claim 2, wherein the activated calcium oxide in the quick lime accounts for 65-75% of the total weight of the quick lime.
7. The ultrafine silica sand tailing powder autoclaved aerated concrete according to claim 2, wherein the slaking temperature of the quicklime is 70-85 ℃.
8. The preparation method of the ultrafine silica sand tailing powder autoclaved aerated concrete according to any one of claims 2 to 7, which comprises the following steps: wet grinding the superfine silica sand tailing powder, the river sand and the aerated concrete crushing waste to prepare slurry, mixing the quick lime, the cement, the desulfurized gypsum and the aluminum powder into the slurry, and mixing, stirring and pouring.
9. The preparation method of the ultrafine silica sand tailing powder autoclaved aerated concrete according to claim 8, which is characterized by further comprising the following steps after the ingredients are poured: static curing, cutting and steam pressure curing.
10. The method for preparing the superfine silica sand tailing powder autoclaved aerated concrete according to claim 9, wherein the static curing temperature is 50-60 ℃, and the pressure of the static curing is 1.15-1.25 MPa.
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| CN116514475A (en) * | 2023-02-21 | 2023-08-01 | 湘潭大学 | Method for preparing lightweight concrete by taking gold mine tailings as aggregate |
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| CN116514475A (en) * | 2023-02-21 | 2023-08-01 | 湘潭大学 | Method for preparing lightweight concrete by taking gold mine tailings as aggregate |
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