Flame-retardant paste material for coal mine downhole air leakage blocking and preparation method thereof

Abstract

The invention relates to a flame-retardant paste material for coal mine downhole air leakage blocking and a preparation method thereof, belonging to a coal mine downhole air leakage blocking material and a preparation method thereof. The flame-retardant paste material comprises the following components: 100 parts of water, 0.2-0.4 part of fatty alcohol polyethenoxy ether, 1-1.5 parts of hydroxyethyl methyl cellulose, 1.875-2.5 parts of gypsum, 7.5-10 parts of cement and 30-40 parts of fly ash. The manufacturing process comprises the following steps: 1, adding the fly ash into water, and stirring to obtain a fly ash slurry solution; 2, simultaneously adding the fatty alcohol polyethenoxy ether and the hydroxyethyl methyl cellulose into the fly ash slurry solution, and sufficiently stirring and mixing to form a thickened fly ash slurry solution; and 3, simultaneously adding a mixture of the gypsum and the cement into the thickened fly ash slurry solution, and sufficiently stirring for 5-10 minutes, thus preparing the flame-retardant paste material for coal mine downhole air leakage blocking. The flame-retardant paste material is high in water retaining capacity, favorable in gelling property, obvious in flame-retardant characteristic, remarkable in air leakage blocking effect and low in cost, and has wide applicability in the aspect of coal mine downhole air leakage blocking.

Description

technical field [0001] The invention relates to a material and a preparation method for plugging leakage in underground coal mines, in particular to a flame-retardant paste material and a preparation method for blocking leakage in underground coal mines. Background technique [0002] Coal spontaneous combustion is one of the main natural disasters in my country's coal mines, causing significant economic losses and seriously threatening the safety of coal mine personnel. Mine coal spontaneous combustion is mainly caused by underground air leakage. Therefore, in order to effectively prevent mine coal spontaneous combustion, it is very important to block underground air leakage points, reduce or eliminate oxygen supply, and prevent coal-oxygen recombination. Spontaneous combustion of coal in mine mining mainly occurs in goafs with air leakage passages, open cutouts, stop production lines, geological structural belts, and high-risk areas of roadways. In order to effectively blo...

AI Technical Summary

Problems solved by technology

However, these methods have some shortcomings. The yellow mud grouting technology needs to consume a large amount of soil, and some areas lacking soil cannot be used and the grout is easy to seep downwards and cannot seal the cracks; the ammonium salt gel releases toxic and harmful gases, and the colloid is easy to crack; The cost of polymer gel is high, and the air plugging effect disappears after the water evaporates; the three-phase foam has no strength, and the stability time is only 8 to 12 hours, and it has not been cured. Once the foam bursts, the air plugging effect will not be achieved; High cost and high requirements on ambient temperature, it can be burned under high temperature conditions; the sealing effect of expansion cement is poor, and it cannot seal small cracks