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Method for preparing autoclaved porous brick

A porous brick and calcium carbide mud technology, which is used in ceramic products, applications, household appliances, etc., can solve the problems of poor utilization of calcium carbide mud, high processing costs, and large land occupation, and achieve a uniform internal structure of the brick body. , the production process is simple, the production cost is low

Inactive Publication Date: 2018-05-18
河北美固建材有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to its high water content and complex composition, a large amount of calcium carbide mud has not been well utilized
At present, the amount of calcium carbide mud accumulated in our country has exceeded 100 million tons, and the processing cost is high and difficult. Stacking it not only takes up a lot of land, but also pollutes the environment
[0004] At present, most of the processing methods of calcium carbide mud are to pile it up idle, and only a small amount is used as auxiliary raw material for the production of cement, wall bricks, and road materials, and the method of producing autoclaved porous bricks with calcium carbide mud as the main raw material has not been reported.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0026] A preparation method of autoclaved porous brick, its specific implementation process is as follows:

[0027] A. Add 0.3 to 0.6 times the weight of calcium carbide mud into water and stir, then add 0.3 to 0.7 times the weight of calcium carbide mud and add hydrochloric acid with a concentration of 25 to 35% and stir to obtain a slurry;

[0028] B. Squeeze out the water in the slurry to obtain slurry residue, add 0.5-0.7 times the weight of fly ash powder, 0.1-0.2 times the cement, 0.2-0.4 times the stone and stir, and then press to form, get bricks;

[0029] C. The bricks are steamed, the steaming temperature is 190-210°C, the steaming pressure is 10-12MPa, and the steaming time is 8-12h, then the pressure is withdrawn, the temperature is lowered, and the kettle is taken out to obtain the autoclaved porous brick.

Embodiment 1

[0031] A. Add 0.3 times the weight of calcium carbide mud to water and stir, then add 0.3 times the weight of calcium carbide mud and add hydrochloric acid with a concentration of 25% and stir to obtain a slurry;

[0032] B. Squeeze out the water in the slurry to obtain slurry slag, add 0.5 times of fly ash powder, 0.1 times of cement, and 0.2 times of stone to the weight of slurry slag and stir, then press and form to obtain bricks;

[0033] C. The bricks are steamed, the steaming temperature is 190°C, the steaming pressure is 10MPa, and the steaming time is 8h, then the pressure is removed, the temperature is lowered, and the autoclaved porous brick is obtained.

[0034] The autoclaved porous brick produced by the present invention is tested in the laboratory for mechanical properties and other properties, the results are as follows: compressive strength 24.9Mpa, bulk density 1.42g / m 3 , The drying shrinkage rate is 0.041%.

Embodiment 2

[0036] A. Add water 0.6 times the weight of calcium carbide mud to the calcium carbide mud and stir, then add 0.7 times the weight of calcium carbide mud with a concentration of 35% hydrochloric acid and stir to obtain a slurry;

[0037] B. Squeeze out the water in the slurry to obtain slurry slag, add 0.7 times of fly ash powder, 0.2 times of cement, and 0.4 times of stone to the weight of slurry slag and stir, then press and form to obtain bricks;

[0038] C. The bricks are steamed, the steaming temperature is 210°C, the steaming pressure is 12MPa, and the steaming time is 12h, then the pressure is removed, the temperature is lowered, and the kettle is taken out to obtain the autoclaved porous brick.

[0039] The autoclaved porous brick produced by the present invention is tested in the laboratory for mechanical properties and other properties, the results are as follows: compressive strength 25.2Mpa, bulk density 1.38g / m 3 , The drying shrinkage rate is 0.037%.

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Abstract

The invention discloses a method for preparing an autoclaved porous brick and belongs to the field of preparation of building materials. The method comprises mixing of raw materials, rolling and steamcuring, wherein the raw materials comprise calcium carbide sludge, hydrochloric acid, coal ash, cement and pebbles. The prepared autoclaved porous brick has the advantages of light weight, excellentthermal insulation property, high strength and small shrinkage strain, can utilize calcium carbide sludge as the raw material, is low in production cost, saves energy and protects the environment.

Description

technical field [0001] The invention relates to the application of calcium carbide mud, in particular to an autoclaved porous brick, which belongs to the field of preparation of building materials. Background technique [0002] Porous bricks are made of clay, shale, fly ash, etc. as the main raw materials. The porosity is equal to or greater than 15%. The hole type is round or non-round. The size of the holes is small and the number is large. High strength, good thermal insulation effect, durability, small shrinkage and deformation, regular appearance, can replace fired clay bricks, and is mainly suitable for load-bearing walls. [0003] Calcium carbide mud is the residue produced by the hydrolysis of calcium carbide to produce acetylene. It is an emulsion with a solid content of 8-10%, also known as calcium carbide slag. Its main chemical composition is calcium hydroxide, which contains calcium silicate, calcium aluminate, ferrosilicon and Carbon residue and other solid im...

Claims

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Application Information

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IPC IPC(8): C04B28/00C04B38/00C04B40/02
CPCC04B28/00C04B40/024C04B2201/20C04B2201/50C04B18/08C04B22/122C04B18/0481C04B38/00
Inventor 张士超张立谦
Owner 河北美固建材有限公司
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