Plastic gel material for preventing spontaneous combustion of coal

Abstract

The invention provides a plastic gel material for preventing spontaneous combustion of coal. The plastic gel material for preventing spontaneous combustion of coal comprises water, a cross-linking agent, a toughening agent, a coagulant, an aggregate and a water glass, wherein the cross-linking agent (AlCit) is obtained by mixing a polymeric aluminium chloride solution and a citric acid solution ina certain ratio and then neutralizing the sodium hydroxide solution; the coagulant is potassium bicarbonate, sodium hydrogen carbonate, ammonium hydrogen carbonate, and one or more of sodium carbonate and glucono-delta-lactone (GDL); the toughening agent is one or more of pregelatinized starch, sodium alginate, carboxymethyl cellulose, and polyacrylamide; aggregate is fly ash or bentonite. The plastic gel material has better water retention, toughness and resistance properties, so that the problems of easy cracking and pulverization of the traditional inorganic silicon gel solid body after water loss is effectively solved, and the material cost is effectively reduced compared with the traditional gel. The plastic gel material can cover the surface of the burning coal body, significantly reducing the temperature of the fire source, the heat radiation and the amount of CO generated, and the fire extinguishing is stable, the re-ignition phenomenon does not occur. In addition, the plasticgel can adhere to the coal body cracks, achieving a good air leakage effect.

Description

technical field [0001] The invention relates to the technical field of fire extinguishing materials, in particular to a plastic gel material for preventing spontaneous combustion of coal. Background technique [0002] Coal spontaneous combustion is a serious threat to the safe production of mines in my country. Fires caused by coal spontaneous combustion not only cause a large number of casualties and property losses, but also cause serious problems such as ecological environment degradation and air pollution. In order to prevent coal spontaneous combustion, goaf grouting, inhibitor spraying, inert gas injection, three-phase foam injection, and colloid injection are widely used at home and abroad; cement foam injection or polymer foam filling in the high-risk area of ​​the roadway is used to stop leakage. While these technologies play an important role in ensuring safe mine production, there are also some problems: for example, the slurry materials (fly ash, yellow mud, etc....

AI Technical Summary

Problems solved by technology

While these technologies play an important role in ensuring safe mine production, there are also some problems: for example, the slurry materials (fly ash, yellow mud, etc.) and water are easily separated during the implementation of traditional grouting technologies, which will affect the normal operation of the working face production; halogen salts (MgCl 2 , CaCl 2 , ZnCl 2 ) Physical inhibitors are cheap, but the inhibitory action time is short; chemical inhibitors such as urea, diamine borate, diammonium phosphate, and carbamate are not suitable for popularization and application due to their high price

Three-phase foam has poor stability and cannot seal the fire zone for a long time

The cost of polymer foam used in roadway spraying and high-risk area filling and plugging is high. At the same time, the foaming process of the material releases heat, which may easily cause coal spontaneous combustion or gas explosion

[0003] It can be seen that the existing fire-fighting materials have defects in varying degrees. In order to speed up the treatment of existing fire areas and curb the occurrence of new fire areas, there is an urgent need to develop new materials for mine fire prevention and extinguishing, jumping out of existing theories and technologies framework to find more effective fire suppression materials and technologies

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