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Method for preparing water permeable bricks based on coal gangue

A technology of permeable bricks and coal gangue, which is applied in the field of preparing permeable bricks based on coal gangue, can solve the problems of high production cost and low compressive strength of permeable bricks, improve compressive strength and mechanical properties, and improve compressive and flexural resistance Strength, effect of increasing binding degree

Inactive Publication Date: 2018-08-10
方建波
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Problems solved by technology

[0006] Technical problem to be solved by the present invention: Aiming at the current problems of high production cost and low compressive strength of permeable bricks, a method for preparing permeable bricks based on coal gangue is provided

Method used

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  • Method for preparing water permeable bricks based on coal gangue

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preparation example Construction

[0022] Preparation of added granules: Put serpentine and boehmite in a pulverizer at a mass ratio of 3:2 for crushing, pass through a 200-mesh sieve, and collect sieved particles to obtain added granules.

[0023] Accelerator preparation: Mix tourmaline powder and montmorillonite at a mass ratio of 1:2.

[0024] A method for preparing permeable bricks based on gangue, the method comprising the steps of:

[0025] (1) Take coal gangue and put it into a ball mill for 2 hours at 800r / min, collect ball mill A, mix ball mill A with 0.3mol / L sodium chloride solution at a mass ratio of 1:3, and let it stand for 1~3h , remove impurities floating on the surface, filter, collect the filter residue, dry the filter residue, pulverize, pass through a 100-mesh sieve, and collect the sieved particles;

[0026] (2) Put the sieved particles and papermaking black liquor into a ball mill at a mass ratio of 7:1~3 for 50 minutes at 500r / min, use carbon dioxide for protection during the ball millin...

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Abstract

The invention discloses a method for preparing water permeable bricks based on coal gangue, belonging to the field of water permeable bricks. According to the method, the coal gangue having adhesive property is melted at the high temperature in the carbon dioxide atmosphere; under the action of high temperature, the formed sodium metaaluminate reacts with carbon dioxide, so that sodium hydrogen carbonate is produced; sodium hydrogen carbonate is further decomposed by heat so as to produce sodium carbonate, and pore-forming is carried out, so that the porosity is increased; furthermore, the adsorbed lignin, cellulose and the like are thermally decomposed, so that the pores are protected; then, particles and cryolite powder are added, mixed and calcined, and the melting point of the mixtureis lowered by means of the cryolite powder; in a calcining process, a serpentine structure is destroyed, and magnesium-like olivine is formed, so that the porosity is increased, and the strength is improved; furthermore, silica in the calcined product reacts with the sodium carbonate so as to form sodium silicate, so that the bonding strength between the substances is improved, and the compressionresistance and the breaking strength are improved. The method solves the problems of high production cost and low compressive strength of the existing water permeable bricks.

Description

technical field [0001] The invention belongs to the field of permeable bricks, in particular to a method for preparing permeable bricks based on coal gangue. Background technique [0002] With the rapid development of the economy and the acceleration of urbanization, the urban surface is covered by more and more impermeable materials such as cement pavement and asphalt pavement, which brings convenience to traffic, but also causes many negative effects. A large number of studies have shown that, compared with impermeable pavement, permeable brick pavement has the functions of alleviating surface runoff, recharging underground, purifying pavement rainwater, improving urban thermal environment, absorbing urban noise, and improving the ecological environment of urban surface soil. Our country is now at the peak of urbanization, the urban area is getting bigger and bigger, the original farmland, ponds and wetlands are gone, and the "hardening" of the surface has replaced the "gr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/26C04B18/02C04B18/12
CPCC04B18/023C04B18/12C04B28/26C04B2111/00284C04B2201/50C04B14/04C04B14/104C04B22/126C04B14/042C04B14/303Y02W30/91
Inventor 方建波施衍刘佳
Owner 方建波
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