Fire extinguishing with the superior performance of fly ash composite colloid material is a cost-effective colloid fire prevention\ntechnology. In this paper, a new powder additive (suspending agent (XK-XJ) and gelling agent) was developed for the existing fire\nextinguishing technology of fly ash compound colloid. Tests show that the best additions to the fly ash slurry were 0.3% and\n0.1-0.3%, respectively. The grouting technical scheme of adding a suspending agent on the ground and gelling agent downhole\nwas proposed to solve the problems of solid material settlement and blockage in the long-distance pipeline transportation process.\nFinally, the optimized fly ash colloid fire prevention and extinguishing technology was successfully applied to the fire control\nengineering examples of close-range coal seam groups, and the rationality of the developed powder and its proportion was tested,\nand the feasibility in coal fire control was tested.
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