Coal spontaneous combustion (CSC) brings great danger to mine safety. Although traditional colloidal fire-fighting materials can reside at high fire source points, their permeability and fluidity are poor, and such materials focus on their water absorption, but pay less attention to water retention and resistance, which makes their fire-fighting effect not good. This paper proposed a new type of mining fire prevention colloid material (CPS-α), which had good solid water gel formation, viscosity, fluidity, and blocking properties to compensate for traditional colloids' shortcomings. According to the single-factor experiment, polymeric polyacrylamide (PAM) as the base material, sodium carboxymethyl cellulose (CMC) as the coagulant, modified starch (SS) as the flame retardant and reduced ascorbic acid were determined. After gel treatment, compared with raw coal, the critical temperature point of spontaneous combustion of coal was increased by about 28 °C, the time to reach the critical temperature point was delayed by 190s, and the characteristic temperature points were significantly increased; the overlap area of coal and water increases by about 20 % after adding gel, and the change slope of the diffusion coefficient of water decreases, which indicated that CPS-α had good flame retardant effect.

中文翻译：

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新型矿用防火凝胶的制备及其阻燃性能


煤炭自燃（CSC）给矿井安全带来极大的危险。传统的胶体消防材料虽然能驻留在高火源点，但其渗透性和流动性较差，且此类材料注重其吸水性，而较少关注保水性和阻水性，导致其灭火效果不佳。提出了一种新型矿用防火胶体材料(CPS-α)，该材料具有良好的固体水凝胶形成性、粘度、流动性和阻塞性能，弥补了传统胶体的缺点。通过单因素实验确定了以聚合聚丙烯酰胺（PAM）为基料、羧甲基纤维素钠（CMC）为混凝剂、变性淀粉（SS）为阻燃剂和还原抗坏血酸。凝胶处理后，与原煤相比，煤自燃临界温度点提高了约28℃，达到临界温度点的时间延迟了190s，特征温度点显着增加；添加凝胶后煤与水的重叠面积增加了约20%，水的扩散系数变化斜率减小，表明CPS-α具有良好的阻燃效果。