Composite gel for preventing spontaneous combustion of coal

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...

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