US 11,718,792 B2
Fly ash-based environmentally-friendly hydrogel with high water retention for preventing and controlling spontaneous combustion of coal in mine and preparation method thereof
Botao Qin, Jiangsu (CN); Quanlin Shi, Jiangsu (CN); Mingyue Hao, Jiangsu (CN); Shuang Zhao, Jiangsu (CN); Yizhen Xu, Jiangsu (CN); Xu Shao, Jiangsu (CN); and Zujie Ma, Jiangsu (CN)
Assigned to CHINA UNIVERSITY OF MINING AND TECHNOLOGY, Jiangsu (CN)
Filed by CHINA UNIVERSITY OF MINING AND TECHNOLOGY, Jiangsu (CN)
Filed on Nov. 30, 2022, as Appl. No. 18/71,653.
Claims priority of application No. 202111447954.3 (CN), filed on Nov. 30, 2021.
Prior Publication US 2023/0167366 A1, Jun. 1, 2023
Int. Cl. C09K 21/10 (2006.01); C09K 21/02 (2006.01); C10L 5/02 (2006.01); C10L 10/00 (2006.01)
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.