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Composite gel for preventing spontaneous combustion of coal

A coal spontaneous combustion and colloidal technology, applied in fire prevention, dust prevention, mining equipment, etc., can solve the problems of not being suitable for large-area filling, affecting the effect of plugging air, polluting underground air, etc., and achieves low price, slow dehydration, and enhanced The effect of adhesion

Inactive Publication Date: 2011-09-07
CHINA UNIV OF MINING & TECH (BEIJING) +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, the existing colloid fire prevention technology has also exposed many problems in practical application, such as: ammonia gas is released during the colloid formation process, which pollutes the underground air and endangers the health of workers; the colloid has low strength and is rigid. It cannot be restored, so after the pressure injection is completed, it will be fractured when encountering mine pressure, which will affect the plugging effect; the gel cost is generally 60 yuan / m 3 Above, higher than the cost of yellow mud grouting, water sand filling, etc., not suitable for large area filling

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A composite colloid for preventing spontaneous combustion of coal. The components include: 5% base material, 2% coagulant accelerator, 6% aggregate, 0.5% water-retaining agent, and the rest is water. Among them, the base material is water glass, the coagulant is sodium bicarbonate, the aggregate is diatomaceous earth, the water-retaining agent is poly(acrylic acid / acrylamide / clay) superabsorbent resin, and the clay is bentonite. The gelling time is 3 minutes.

Embodiment 2

[0022] A composite colloid for preventing spontaneous combustion of coal. The components include: 8% base material, 3% coagulant accelerator, 9% aggregate, 1% water-retaining agent, and the rest is water. Among them, the base material is water glass, the coagulant is sodium bicarbonate, the aggregate is diatomite, the water-retaining agent is poly(acrylic acid / acrylamide / clay) superabsorbent resin, and the clay is calcined kaolin. The colloid forming time is 2min.

Embodiment 3

[0024] A composite colloid for preventing spontaneous combustion of coal. The components include: 6% of base material, 4% of coagulant accelerator, 7% of aggregate, 0.5% of water-retaining agent, and the rest is water. Among them, the base material is water glass, the coagulant is sodium bicarbonate, the aggregate is diatomaceous earth, the water-retaining agent is poly(acrylic acid / acrylamide / clay) superabsorbent resin, and the clay is bentonite. The gelling time is 1 min.

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PUM

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Abstract

The invention discloses a composite gel for preventing spontaneous combustion of coal, which comprises the following ingredients in percentage by weight: 5 to 8 percent of base material, 2 to 5 percent of accelerating agent, 6 to 9 percent of aggregate material, 0.5 to 3 of water-retaining agent and the balance of water. The base material is water glass, the accelerating agent is sodium bicarbonate, the aggregate material is diatomite, and the water-retaining agent is salt-resistant highly-water-absorbent resin. The salt-resistant highly-water-absorbent resin is made by aqueous solution polymerization or reverse-phase suspension polymerization, and has a water absorbency of 1250 to 1355 g<g> and a salt absorbency of 100 to 120 g<g>. The produced gel is excellent in leak stoppage, oxygen insulation, temperature drop and retardancy, has good fluidity and strong moisture-retaining property and can slow water loss. The gel products with different gelling time are made by adjusting the proportions. The gel is convenient and flexible in use, has strong adaptability, and can be widely applied to various high-risk and self-combustible coal areas.

Description

technical field [0001] The invention relates to a fire-preventing and extinguishing material used in coal mines, in particular to a fire-preventing and extinguishing compound colloid which uses diatomite as the main component to prevent spontaneous combustion of coal. Background technique [0002] my country's coal mines have complex conditions and harsh environments. Every year, various accidents will cause huge economic and property losses to the country. Among them, coal spontaneous combustion is a common phenomenon. [0003] In our country, mines that spontaneously combust are widespread and numerous, seriously threatening the personal safety of mines and miners. According to statistics, the coal seam outcrop fire area in 7 provinces in northern my country has an area of ​​720km 2 , 4.2 billion tons of coal have been burned accumulatively, and it is still developing at a rate of 50-60 million tons of coal burned every year. And mine coal seam spontaneous combustion fir...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/26E21F5/00C04B14/08
Inventor 朱红青索红莉张腾刘敏马麟王毅袁惠萍郭艾东赵锋刘德峰
Owner CHINA UNIV OF MINING & TECH (BEIJING)
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