CPC C09K 21/10 (2013.01) [C09K 21/02 (2013.01); C10L 5/02 (2013.01); C10L 10/00 (2013.01)] | 10 Claims |
1. A fly ash-based environmentally-friendly hydrogel with a high water retention for preventing and controlling spontaneous combustion of coal in a mine, comprising the following raw materials in the following weight percentages: 10% to 30% of a gel-forming material A, 20% to 45% of a crosslinking material B, and water as a balance; wherein the gel-forming material A is prepared by physical blending of a biodegradable superabsorbent resin, anionic polyacrylamide, a sesbania gum, and fly ash in a first weight ratio of (1-3):(0.5-1):(0.5-1):(95-98); and the crosslinking material B is prepared by subjecting zeolite, expandable graphite, and an aluminum citrate complex in a second weight ratio of (60-78):(20-36):(2-4) to mixing, dispersing, adsorbing, and freeze-drying; and
the fly ash-based environmentally-friendly hydrogel with the high water retention for preventing and controlling the spontaneous combustion of the coal in the mine is prepared by the following steps:
1) adding the gel-forming material A to water according to the weight percentages, followed by stirring at a room temperature for 5 min to 10 min to obtain a homogenous composite suspension; and
2) adding the crosslinking material B to the composite suspension according to the weight percentages, followed by stirring at room temperature for 3 min to 5 min to obtain the fly ash-based environmentally-friendly hydrogel with the high water retention for preventing and controlling the spontaneous combustion of the coal in the mine.
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