A kind of mine sealing material based on micp technology

A plugging material and mine-used technology, which is applied in the field of new functional materials in coal mines, can solve the problems of affecting the extraction effect and extraction quality, poor sealing effect, and being easily affected by the mine environment, achieving huge environmental benefits and Economic benefits, improvement of gas drainage concentration and drainage efficiency, and good promotion value

Active Publication Date: 2022-02-22
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In the process of gas extraction in underground coal mines, it is easy to be affected by the mine environment, which in turn affects the extraction effect and quality
At present, the temperature in the sealing process of gas drainage drilling in coal mines in my country is 25-30°C, the humidity is 90%-100%, and the air pressure is about atmospheric pressure. Implementation, the sealing effect is not good

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Example 1: A mine plugging material based on MICP technology, the mass percentage of each component is as follows: P·Ⅱ42.5 grade cement 40%, limestone aggregate 1%, fine sand 2%, polycarboxylate water reducing Agent 1%, tap water 20%, Bacillus sphaericus 18%, urea 10%, calcium chloride 8%.

[0020] The above-mentioned substances are weighed as raw materials according to mass percentage, and the particle size range of the fine sand taken out is 0.125~0.25mm; the limestone aggregate is continuously graded from 0.16~1mm; the polycarboxylate water reducer is powder. Mix and stir the above-mentioned cement, fine sand, limestone aggregate, and polycarboxylate water reducer to make powder A; add microorganisms, urea, and calcium chloride to water, and stir evenly to make liquid Material B; add powder A to liquid material B, stir and mix well; the material is prepared at 25°C.

[0021] After testing, the materials obtained in this example are used to repair borehole fissures, ...

Embodiment 2

[0022] Example 2: A mine plugging material based on MICP technology, the mass percentage of each component is as follows: P·Ⅱ42.5 grade cement 45%, limestone aggregate 1.2%, fine sand 1.8%, polycarboxylate water reducing Agent 0.8%, tap water 20%, Bacillus sphaericus 14%, urea 9%, calcium chloride 8.2%.

[0023] The above-mentioned substances were weighed as raw materials according to the mass percentage, wherein the particle size range of the fine sand taken out was 0.125~0.25mm; the limestone aggregate was continuously graded from 0.16~1mm; the polycarboxylate water reducer was powder; the above Mix the weighed cement, fine sand, limestone aggregate, and polycarboxylate superplasticizer and stir evenly to make powder A; add microorganisms, urea, and calcium chloride to water and stir evenly to make liquid B ; Add the powder material A into the liquid material B, stir and mix well; the material is prepared at 25°C.

[0024] After testing, the materials obtained in this examp...

Embodiment 3

[0025] Example 3: A mine plugging material based on MICP technology, the mass percentage of each component is as follows: P·Ⅱ 42.5 grade cement 35%, limestone aggregate 2.3%, fine sand 3.2%, polycarboxylate water reducing Agent 1.5%, tap water 25%, Bacillus sphaericus 5%, urea 15%, calcium chloride 13%. Its preparation method is the same as the preparation method described in Example 1.

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PUM

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Abstract

The invention belongs to the technical field of coal mine new functional materials and provides a mine plugging material based on MICP technology. It is especially suitable for sealing holes in coal seam gas drainage drilling. It is prepared by mixing P·Ⅱ42.5 grade cement, limestone aggregate, fine sand, polycarboxylate water reducer, tap water, microorganisms, urea, and calcium chloride in proportion. Use microorganisms to induce calcium carbonate deposition to repair the borehole fissures and increase the gas concentration of the drainage; as the drainage proceeds, fissures appear in the confined space and the surrounding coal and rock mass, water and air penetrate through the fissures, activating the dormant microbial spores, Then proliferate and eat the ingredients in the nutrient solution to generate carbonate with cementation effect, repair the cracks that appear, and then increase the gas concentration of the extraction. The invention effectively blocks the gas leakage channel in the process of gas drainage, greatly increases the gas concentration in the drainage borehole, and prolongs the service time of the coal seam gas drainage borehole.

Description

technical field [0001] The invention belongs to the technical field of coal mine new functional materials, and in particular relates to a mine plugging material based on MICP technology. Background technique [0002] Coal bed methane is a kind of unconventional natural gas, and it is also the "first killer" in the process of coal development. In recent years, with the continuous increase of mining depth, the high geostress and high gas gradient in deep coal seams further increase the frequency and intensity of gas disasters. The efficient extraction of coalbed methane is of vital significance in the future of coal and gas co-mining in my country. The effect of gas drainage is closely related to factors such as drainage borehole layout, borehole sealing, coal seam air permeability, drainage device design, and operator installation level. A large number of on-site investigations found that: The airtightness of the gas directly determines the gas drainage rate and becomes one...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/04C04B111/72
CPCC04B28/04C04B2111/00724C04B2111/00663C04B2111/72
Inventor 高亚斌李子文王飞郭晓亚向鑫唐一博
Owner TAIYUAN UNIV OF TECH
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