Preparation method for multiphase gel foam for preventing coal from spontaneous combustion

Abstract

The invention discloses a preparation method for a multiphase gel foam for preventing coal from spontaneous combustion. High-activity magnesium oxide, prepared with magnesite as the raw material, hasa strong cementation effect on coal and coal ash. High-activity magnesium oxide is compounded with crosslinked polyacrylamide microspheres and added to a coal ash base gel foam system. High-activity magnesium oxide and other sold incombustible media are mixed and fill the interlaced gel network structure, and the gel performance of the whole gel foam system can be strengthened. The whole foam system is good in water-retaining performance and strong in heat absorption and cooling ability. In addition, magnesium oxide particles and crosslinked polyacrylamide microspheres are small in particle size, and can fully fill the cracks between the fragmented coals. Polyacrylamide microspheres can dissolve and swell slowly in water; fractures can be blocked by the microspheres after dissolving and swelling; and long-time stability can be maintained. A film-shaped covering layer can also be formed after the gel foam bursts. The coal body can be closely covered and packed by the film-shaped covering layer, and the fractures can be blocked. Adsorption of oxygen by coal can be obstructed enduringly and effectively; and spontaneous combustion of coal can be prevented more effectively.

Description

technical field [0001] The invention relates to the technical field of anti-fire extinguishing materials, in particular to a preparation method of multi-phase gel foam for preventing and controlling coal naturalness. Background technique [0002] Coal spontaneous combustion is one of the main natural disasters in coal mine production, which seriously threatens the personal safety of underground workers and causes great property and economic losses to the country. At present, the prevention and control technologies of coal spontaneous combustion at home and abroad mainly include preventive grouting, spraying sun inhibitors, injection of inert gas, gel and three-phase foam, etc. These technologies have played an important role in ensuring the safety of coal mine production, but there are still some shortcomings : Such as grouting, the slurry only flows to low-lying places, and cannot cover the middle and high-level coal bodies; injecting inert gas, the gas is easy to diffuse w...

AI Technical Summary

Problems solved by technology

At present, the prevention and control technologies of coal spontaneous combustion at home and abroad mainly include preventive grouting, spraying sun inhibitors, injection of inert gas, gel and three-phase foam, etc. These technologies have played an important role in ensuring the safety of coal mine production, but there are still some shortcomings : Such as grouting, the slurry only flows to low-lying places, and cannot cover the middle and high-level coal bodies; injecting inert gas, the gas is easy to diffuse with air leakage, and is not easy to stay in the fire prevention area; injecting polymer gel, the flow rate Smaller, it is difficult to use in large-area goaf fire areas; injecting three-phase foam, the foam is generally stable for 8-12 hours, and cannot be solidified. problem