Organic silicon solid slag non-steamed brick and preparation method thereof

Abstract

According to the organic silicon solid slag non-autoclaved brick and the preparation method thereof, the organic silicon solid slag non-autoclaved brick is prepared by taking waste organic silicon solid waste incineration organic silicon solid slag, carbide slag, fly ash and cement as main raw materials, various mineral materials are compounded, the synergistic, superposition and coupling effects among the materials are fully exerted, and the organic silicon solid slag non-autoclaved brick is prepared. Meanwhile, on the basis of a superfine powder grinding technology, the structure of the organic silicon solid slag non-steamed brick can be more compact, the compressive strength and breaking strength are greatly enhanced, the drying shrinkage is reduced, the compressive strength after freezing is enhanced, meanwhile, the material cost is reduced, the development of the later strength of concrete is stabilized, and the later cracking resistance of a finished product is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of building materials, and particularly relates to an organosilicon solid slag steam-free brick and a preparation method thereof. Background Art

[0002] At present, a large amount of pulp residue is generated in the production process of silicone monomers. The pulp residue is hydrolyzed to obtain hydrolyzed solid residue. The solid residue is passed through a special incineration system to produce silicone solid residue. The silicone solid residue contains a large amount of silicon dioxide. After being discarded, it will cause serious environmental pollution to the surface. Stacking also requires a large area. Enterprises have to devote a lot of manpower and financial resources to deal with this problem.

[0003] The carbide slag discharged from the chlor-alkali plant in the process of producing acetylene by reacting carbide with water is mainly composed of calcium hydroxide. More than 2 tons of carbide slag are discharged for every ton of polyvinyl chloride produced. The amount of carbide slag is large, the alkali content is high, and it also contains harmful substances such as sulfur and arsenic. If it is discharged without treatment, it will clog the sewer, accumulate the riverbed, and endanger fishery production. Stacking it on land will occupy land and pollute the environment.

[0004] Fly ash is the main solid waste discharged by coal-fired power plants and one of the largest industrial waste residues in my country. With the development of the power industry, the fly ash emissions from coal-fired power plants are increasing at a rate of 200 million tons per year. At present, fly ash is mainly used as a raw material to produce building materials, chemicals, composite materials and other products, or directly used in construction projects, road construction, backfilling and agriculture. Among them, the unburned bricks made with fly ash as the main raw material have the disadvantages of poor water resistance, poor freeze-thaw resistance, and easy cracking. Therefore, further improvement of fly ash bricks is needed. Summary of the invention

[0005] The invention provides an organosilicon solid slag steam-free brick and a preparation method thereof, which are used to solve the problems of poor water resistance, poor freeze-thaw resistance, easy cracking and the like of fly ash autoclaved bricks in the prior art.

[0006] In a first aspect, the present invention provides an organosilicon solid slag steam-free brick, comprising the following raw material system by weight: 15 to 45 parts of organosilicon solid slag ultrafine powder, 18 to 22 parts of carbide slag ultrafine powder, 10 to 30 parts of fly ash, 15 to 30 parts of cement, 0.6 to 1 part of aminosulfonate, 0.3 to 0.7 parts of calcium chloride and 6 to 8.5 parts of water;

[0007] The average particle size of the raw material system is not greater than 10 μm; the specific surface area of ​​the raw material system is not less than 350 m 2 / kg.

[0008] Compared with the prior art, the invention is advantageous in that: it is prepared with organic silicon solid slag from incineration of waste organic silicon solid waste, carbide slag, fly ash and cement as main raw materials, and multiple mineral materials are compounded to give full play to the synergistic, superposition and coupling effects among the materials; at the same time, it is based on ultrafine powder grinding technology, and the average particle size of the raw material system is less than 10μm, and the specific surface area is not less than 350m 2 / kg, can make the structure of organic silicon solid slag steam-free brick more compact, greatly enhance the compressive strength and flexural strength, reduce drying shrinkage, enhance the post-freezing compressive strength, at the same time the present invention reduces the material cost, stabilizes the development of concrete later strength, and improves the ability of finished products to resist cracking in the later stage.

[0009] Furthermore, the particle size of the ultrafine organic silicon solid slag powder is not greater than 1250 mesh; the particle size of the ultrafine calcium carbide slag powder is not greater than 1250 mesh.

[0010] Furthermore, the mass percentage of active calcium oxide in the carbide slag is not less than 40%.

[0011] Furthermore, the mass percentage of the carbide slag in the raw material system is not less than 20%.

[0012] Furthermore, the mass ratio of water to cement in the raw material system is (0.28-0.35):1.

[0013] Furthermore, the specific surface area of ​​the raw material system is not less than 550m 2 / kg.

[0014] In a second aspect, the present invention provides a method for preparing an organosilicon solid slag steam-free brick, which is used to prepare the organosilicon solid slag steam-free brick described in the first aspect, comprising the following steps:

[0015] S1, subjecting cement, fly ash, ultrafine carbide slag powder and ultrafine organosilicon solid slag powder to a first stirring treatment to obtain a dry mix;

[0016] S2, adding sulfamate, calcium chloride and water to the dry mix, performing a second stirring treatment to obtain a raw material system;

[0017] S3, performing pressing and molding treatment on the raw material system in sequence to obtain a brick;

[0018] S4, performing curing treatment on the brick blank to obtain organic silicon solid slag steam-free brick.

[0019] Furthermore, the pressing and forming process is carried out using an unburned brick forming machine, the pressure of the pressing and forming process is 20 to 25 MPa, and the time is 1 to 3 seconds.

[0020] Furthermore, the first stirring treatment is performed by a forced stirrer, the stirring rate is not less than 45 rpm, and the stirring time is 2 to 3 minutes; and / or,

[0021] The second stirring treatment is performed using a forced stirrer, with a stirring rate of not less than 45 rpm and a stirring time of 6 to 10 minutes.

[0022] Furthermore, the curing treatment includes covering the brick with a film, and the temperature of the curing treatment is 18 to 20° C. and the time is 24 to 48 hours. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in combination with the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] In a first aspect, the present invention provides an organosilicon solid slag steam-free brick, comprising the following raw material system by weight: 15 to 45 parts of organosilicon solid slag ultrafine powder, 18 to 22 parts of carbide slag ultrafine powder, 10 to 30 parts of fly ash, 15 to 30 parts of cement, 0.6 to 1 part of aminosulfonate, 0.3 to 0.7 parts of calcium chloride and 6 to 8.5 parts of water;

[0025] The average particle size of the raw material system is not greater than 10 μm; the specific surface area of ​​the raw material system is not less than 350 m 2 / kg.

[0026] The present invention is prepared with organic silicon solid slag, carbide slag, fly ash and cement obtained by incineration of waste organic silicon solid waste as the main raw materials, compounding a variety of mineral materials to give full play to the synergistic, superposition and coupling effects among the materials, and based on ultrafine powder grinding technology, the average particle size of the raw material system is less than 10μm, and the specific surface area is not less than 350m 2 / kg, can make the structure of organic silicon solid slag steam-free brick more compact, greatly enhance the compressive strength and flexural strength, reduce drying shrinkage, enhance the post-freezing compressive strength, at the same time the present invention reduces the material cost, stabilizes the development of concrete later strength, and improves the ability of finished products to resist cracking in the later stage.

[0027] Furthermore, the particle size of the ultrafine organic silicon solid slag powder is not greater than 1250 mesh; the particle size of the ultrafine calcium carbide slag powder is not greater than 1250 mesh.

[0028] In a specific embodiment, the mass percentage of active calcium oxide in carbide slag is not less than 40%; the mass percentage of carbide slag in the raw material system is not less than 20%.

[0029] By further limiting the content of active calcium oxide in carbide slag, it can replace lime to stimulate the activity of fly ash, thereby further improving the strength of the prepared organic silicon solid slag steam-free bricks; and by limiting the amount of carbide slag added, bricks with the same effect as using lime can be obtained.

[0030] In a specific embodiment, the mass ratio of water to cement in the raw material system is (0.28-0.35):1.

[0031] Furthermore, the specific surface area of ​​the raw material system is not less than 550m 2 / kg; it can further make the structure of the organic silicon solid slag steam-free brick more compact, further improve the anti-seepage and anti-corrosion capabilities, and further improve the strength of the brick.

[0032] In a second aspect, the present invention provides a method for preparing an organosilicon solid slag steam-free brick, which is used to prepare the organosilicon solid slag steam-free brick of the first aspect, comprising the following steps:

[0033] S1, subjecting cement, fly ash, ultrafine carbide slag powder and ultrafine organosilicon solid slag powder to a first stirring treatment to obtain a dry mix;

[0034] S2, adding sulfamate, calcium chloride and water to the dry mix, performing a second stirring treatment to obtain a raw material system;

[0035] S3, pressing and molding the raw material system in sequence to obtain a brick;

[0036] S4, performing curing treatment on the brick blank to obtain organic silicon solid slag steam-free brick.

[0037] Furthermore, the pressing and forming process is carried out using an unfired brick forming machine, and the pressure of the pressing and forming process is 20 to 25 MPa, and the time is 1 to 3 seconds.

[0038] Furthermore, the first stirring treatment is carried out using a forced mixer, the stirring rate is not less than 45 rpm, and the stirring time is 2 to 3 minutes; the second stirring treatment is carried out using a forced mixer, the stirring rate is not less than 45 rpm, and the stirring time is 6 to 10 minutes.

[0039] In a specific embodiment, the curing treatment includes covering the bricks with a film, and the curing treatment temperature is 18 to 20° C. and the time is 24 to 48 hours.

[0040] Hereinafter, a kind of organic silicon solid slag steam-free brick provided by the present invention is introduced in detail through specific embodiments.

[0041] Example 1

[0042] S1, 30 parts of cement, 15 parts of fly ash, 20 parts of ultrafine carbide slag powder and 20 parts of ultrafine organosilicon solid slag powder are subjected to a first stirring treatment at a stirring speed of 45 rpm for 3 minutes to obtain a dry mix;

[0043] The particle size of the organic silicon solid slag ultrafine powder is 1250 mesh; the particle size of the calcium carbide slag ultrafine powder is 1250 mesh, the mass percentage of active calcium oxide in the calcium carbide slag is 40%, and the average particle size of the dry mixture is 10 μm;

[0044] S2. Add 0.9 parts of aminosulfonate, 0.5 parts of calcium chloride and 10 parts of water to the dry mix, and perform a second stirring treatment at a stirring speed of 45 rpm for 3 minutes to obtain a raw material system; wherein the average particle size of the raw material system is 10 μm, and the specific surface area of ​​the raw material system is 550 m 2 / kg, water-binder ratio is 0.3;

[0045] S3, pressing and molding the raw material system at a pressure of 25 MPa for 1 second to obtain a brick;

[0046] S4. Cover the brick with a film and perform a curing treatment at 20°C for 24 hours to obtain an organosilicon solid slag steam-free brick.

[0047] Example 2

[0048] The difference between this embodiment and embodiment 1 is that the raw materials include, by mass, 25 parts of cement, 20 parts of fly ash, 20 parts of carbide slag, 25 parts of organosilicon solid slag, 0.9 parts of aminosulfonate, 0.5 parts of calcium chloride, and 7.5 parts of water; the average particle size of the raw material system is 10 μm, and the specific surface area of ​​the raw material system is 570 m 2 / kg, water-to-cement ratio is 0.3.

[0049] Example 3

[0050] The difference between this embodiment and embodiment 1 is that the raw material system includes, by mass, 20 parts of cement, 20 parts of fly ash, 20 parts of carbide slag, 30 parts of organosilicon solid slag, 0.9 parts of aminosulfonate, 0.5 parts of calcium chloride, and 6.6 parts of water; the average particle size of the raw material system is 10 μm, and the specific surface area of ​​the raw material system is 550 m 2 / kg, water-to-cement ratio is 0.33.

[0051] Example 4

[0052] The difference between this embodiment and embodiment 1 is that the particle size of the ultrafine organic silicon solid slag powder is 240 mesh, the particle size of the ultrafine calcium carbide slag powder is 240 mesh, and the average particle size of the dry mixture is 38 μm.

[0053] Example 5

[0054] The difference between this embodiment and embodiment 1 is that the particle size of the ultrafine organic silicon solid slag powder is 400 mesh, the particle size of the ultrafine calcium carbide slag powder is 400 mesh, and the average particle size of the dry mixture is 60 μm.

[0055] Example 6

[0056] The difference between this embodiment and embodiment 1 is that the amount of ultrafine carbide slag powder added is 18 parts, and the amount of water added is 6.6 parts.

[0057] Example 7

[0058] The difference between this embodiment and embodiment 1 is that the raw material system includes, by mass, 18 parts of ultrafine carbide slag powder, 0.5 parts of calcium chloride, and 11.4 parts of water.

[0059] Example 8

[0060] The difference between this embodiment and embodiment 1 is that the pressure of the pressing process is 15 MPa.

[0061] Test Example 1

[0062] The compressive strength test of the organic silicon solid slag steam-free bricks prepared in the above embodiment was carried out, and the results are shown in Table 1.

[0063] Table 1

[0064]

[0065] From the overall trend of the data in the table, combined with the formula and preparation conditions of each embodiment, it can be seen that as the amount of cement increases, the compressive strength and flexural strength of the finished product increase, the drying shrinkage performance decreases, the carbonization coefficient increases slightly, the post-freezing compressive strength increases, and the dry mass loss decreases.

[0066] The product made in the embodiment of the present invention has good compressive strength and flexural strength performance, and other performance index data are better than the index data required by the standard.

[0067] The present invention reduces the environmental pollution problem caused by the accumulation of industrial solid waste by adopting materials such as ultrafine powder of organic silicon solid slag, ultrafine powder of calcium carbide slag, fly ash, cement, aminosulfonate water reducer and calcium chloride early strength agent, and enhances the early strength of organic silicon solid slag steam-free bricks from multiple dimensions. While eliminating the need for steam curing, it greatly reduces the amount of cement used and significantly reduces the carbon emissions in the production process. At the same time, the present invention reduces the material cost, stabilizes the development of the later strength of concrete, and improves the ability of the finished product to resist cracking in the later stage.

[0068] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein by equivalents. If these modifications and variations fall within the scope of the claims of the present invention and their equivalent technologies, they should be considered to be within the protection scope of the present invention.

Claims

1. An organosilicon solid slag steam-free brick, characterized in that: The raw material system comprises the following parts by weight: 15-45 parts of ultrafine organic silicon solid slag powder, 18-22 parts of ultrafine calcium carbide slag powder, 10-30 parts of fly ash, 15-30 parts of cement, 0.6-1 parts of aminosulfonate, 0.3-0.7 parts of calcium chloride and 6-8.5 parts of water; The average particle size of the raw material system is not greater than 10 μm; the specific surface area of ​​the raw material system is not less than 350 m 2 / kg.

2. The organic silicon solid slag steam-free brick according to claim 1, characterized in that: The particle size of the ultrafine organic silicon solid slag powder is not greater than 1250 mesh; the particle size of the ultrafine calcium carbide slag powder is not greater than 1250 mesh.

3. The organic silicon solid slag steam-free brick according to claim 1, characterized in that: The mass percentage of active calcium oxide in the carbide slag is not less than 40%.

4. The organic silicon solid slag steam-free brick according to claim 1, characterized in that: The mass percentage of the carbide slag in the raw material system is not less than 20%.

5. The organic silicon solid slag steam-free brick according to claim 1, characterized in that: The mass ratio of water to cement in the raw material system is (0.28~0.35):

1.

6. The organic silicon solid slag steam-free brick according to any one of claims 1 to 5, characterized in that: The specific surface area of ​​the raw material system is not less than 550m 2 / kg.

7. A method for preparing an organosilicon solid slag steam-free brick, used for preparing the organosilicon solid slag steam-free brick according to any one of claims 1 to 6, characterized in that: The following steps are involved: S1, subjecting cement, fly ash, ultrafine carbide slag powder and ultrafine organosilicon solid slag powder to a first stirring treatment to obtain a dry mix; S2, adding sulfamate, calcium chloride and water to the dry mix, performing a second stirring treatment to obtain a raw material system; S3, performing pressing and molding treatment on the raw material system in sequence to obtain a brick; S4, performing curing treatment on the brick blank to obtain organic silicon solid slag steam-free brick.

8. The method for preparing organic silicon solid slag steam-free bricks according to claim 7, characterized in that: The pressing and forming process is carried out using an unburned brick forming machine, the pressure of the pressing and forming process is 20-25 MPa, and the time is 1-3 seconds.

9. The method for preparing organic silicon solid slag steam-free bricks according to claim 7, characterized in that: The first stirring treatment is performed by a forced stirrer, with a stirring rate of not less than 45 rpm and a stirring time of 2 to 3 minutes; and / or, The second stirring treatment is performed using a forced stirrer, with a stirring rate of not less than 45 rpm and a stirring time of 6 to 10 minutes.

10. The method for preparing organic silicon solid slag steam-free bricks according to any one of claims 7 to 9, characterized in that: The curing treatment includes covering the brick with a film, and the temperature of the curing treatment is 18-20° C. and the time is 24-48 hours.

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