Preparation method of coal gangue foam concrete

A foamed concrete and coal gangue technology, applied in ceramic products, applications, household appliances, etc., can solve the problems of high production cost, complex process flow, large cement consumption, etc., to save crushing equipment and costs, simple operation process, saving cost effect

Inactive Publication Date: 2015-04-01
HUNAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] (1) The technological process is complicated. Before preparing the gangue foam concrete, the gangue should be calcined
[0010] (2) The process conditions are harsh, and the activation and calcination of coal gangue needs to be carried out under high temperature conditions, generally around 750°C, which consumes a lot of energy
[0011] (3) During the calcination process, a large amount of harmful gas is produced, which pollutes the environment
[0012] (4) The amount of cement used in the preparation process is large, the weight ratio of cement to coal gangue is 50:50, and the production cost is high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The preparation method of gangue foamed concrete of the present invention comprises the steps of:

[0026] A. Take 5 parts by weight of KD-1 foaming agent and 50-80 parts by weight of water, mix them uniformly and foam in a high-speed disperser (rotating speed 2000-3000rad / min) for 3-5 minutes, and prepare foam for subsequent use;

[0027] B, take by weighing the PO425 cement of 20 weight parts, the particle size of 55~65 parts by weight is the coal gangue of 0.5~6mm, the water of 15~20 parts by weight and add early strengthening agent by cement weight 3~5%, then in Stir in the mixer evenly to prepare concrete paste;

[0028] C. Add the prepared foam into the concrete slurry, stir for 2 to 6 minutes until the slurry is uniform, and prepare the foamed concrete slurry, and then inject the prepared foamed concrete slurry into the pre-prepared mold for molding, and let it rest for 24 hours Put it into the concrete standard constant temperature and humidity curing box (temp...

Embodiment 2

[0030] The resting time of the preparation process is 24 hours, the curing temperature is 19-21°C, and the relative humidity is 95%-99%.

[0031] In the first step, weigh 6 parts by weight of KD-1 foaming agent and 50-70 parts by weight of water, mix them evenly, and foam in a high-speed disperser (rotating speed 2000-3000rad / min) for 3-5 minutes to prepare a foam spare;

[0032] In the second step, taking 20 parts by weight of PO425 cement, 60 to 70 parts by weight of coal gangue with a particle size of 0.5 to 6 mm, water of 16 to 25 parts by weight and an additional early strength agent of 1 to 6% by weight of cement, Then stir evenly in the mixer to prepare the concrete slurry;

[0033] The third step is to add the prepared foam into the concrete slurry, stir for 2 to 6 minutes until the slurry is uniform, and prepare the foamed concrete slurry, and then inject the prepared foamed concrete slurry into the pre-prepared mold for molding, and rest for 24 hours Afterwards, pu...

Embodiment 3

[0035] The resting time of the preparation process is 24 hours, the curing temperature is 19-21°C, and the relative humidity is 95%-99%.

[0036] The first step is to weigh 5 parts by weight of KD-1 foaming agent and 40 to 60 parts by weight of water, mix them evenly, and foam in a high-speed disperser (rotating speed 2000 to 3000 rad / min) for 3 to 5 minutes to prepare a foam spare;

[0037] The second step is to weigh 25 parts by weight of PO425 cement, 70 to 90 parts by weight of coal gangue with a particle size of 0.5 to 6.5 mm, 18 to 30 parts by weight of water, and 2 to 7% of an external early strength agent by weight of cement , and then stir evenly in a mixer to prepare a concrete slurry;

[0038] The third step is to add the prepared foam into the concrete slurry, stir for 3-7 minutes until the slurry is uniform, and prepare the foamed concrete slurry, and then inject the prepared foamed concrete slurry into the pre-prepared mold for molding, and rest for 24 hours Af...

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PUM

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Abstract

The invention discloses a preparation method of coal gangue foam concrete. The preparation method comprises the steps of firstly, weighing 1 part by weight of a foaming agent KD-1 and 10-30 parts by weight of water, uniformly mixing, and then, foaming in a high-speed dispersion machine ( with the rotating speed being 2000-3000rad/min) for 3-5 minutes to prepare foam for later use; then, weighing 20 parts by weight of PO425 cement, 55-65 parts by weight of coal gangue with the particle size of 0.5-6mm, 15-20 parts by weight of water and an additional early strength agent accounting for 3-5% of the cement in weight, and then, uniformly stirring in a stirrer to prepare concrete slurry; next, adding the preparative foam into the concrete slurry, and stirring for 2-6 minutes until the slurry is uniform to obtain foam concrete slurry; and finally, injecting the prepared foam concrete slurry into a mould prepared in advance for molding, standing for 24 hours, then, placing the molded foam concrete slurry into a standard constant-temperature and constant-humidity concrete curing box (at the temperature being 19-21 DEG C, relative humidity being 95-99%) to cure until all stages of concrete are obtained. According to the preparation method, the coal gangue foam concrete is prepared by taking the uncalcined large-particle coal gangue as a raw material, so that the aim of changing waste materials into valuable things is achieved, the production cost is reduced, and the production efficiency is improved.

Description

technical field [0001] The invention relates to a method for preparing uncalcined large-grain coal gangue foam concrete. The coal gangue foam concrete is mainly used for filling goafs in coal mines. Background technique [0002] In order to prevent natural disasters in the coal mine goaf, it is necessary to fill the coal mine goaf. In my country, the modern filling mining method is mainly based on cemented filling. For some coal mines with high underground temperature, as a large amount of filling slurry enters the goaf, mine paste cemented filling can reduce the underground temperature. And for those coal mines where the goaf has a tendency to spontaneously ignite, after the slurry is filled into the goaf, the gangue falling out of the goaf is consolidated into a whole, the air is isolated, and the goaf is prevented from spontaneously igniting. The use of cemented filling has solved the problem of underground environmental pollution, reduced the cost of filling and mining,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/02C04B28/04
Inventor 张欣周海兵周剑林冯涛申少华伍泽广
Owner HUNAN UNIV OF SCI & TECH
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