矿用煤自燃防治高吸水高保水性水凝胶的制备及性能研究
Study on preparation and properties of hydrogels for prevention of coal spontaneous combustion with high water absorption and water retention
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摘要: 针对煤矿煤自燃问题，采用化学交联法，在碱性条件下研制出以木质素、羧甲基纤维素和聚乙烯醇为基体的矿用煤自燃防治高吸水高保水性水凝胶。研究水凝胶的溶胀性能和保水性能，并测试不同原料配比的水凝胶的吸水率、产率和保水率，选择出适合煤矿煤自燃防治的凝胶配比，并采用程序升温实验对凝胶的阻化性能进行分析。结果表明：高吸水高保水性水凝胶的溶胀性能和保水性能良好，固水作用强，水凝胶的吸水率、产率以及保水率受原料质量体积分数影响；程序升温实验表明，水凝胶使煤自燃过程中的CO产生量降低了38.09 %~52.78 %，抑制了煤的氧化过程。Abstract: Aiming at the problem of coal spontaneous combustion in coal mine, a mine hydrogel with high water absorption and water retention, which is based on lignin, carboxymethyl cellulose and polyvinyl alcohol, has been developed by using chemical crosslinking method under alkaline condition. The swelling property and water retention property of hydrogels were studied, and the water absorption, yield and water retention rate of hydrogels with different ratio of raw materials were tested. The suitable ratio of the gel for coal mine fire prevention was selected, and the resistance property of the gel was analyzed by temperature programmed experiment. The results show that the hydrogels with high water absorption and water retention have good swelling and water retention properties and strong water fixation. The water absorption, yield and water retention of the hydrogels are affected by the mass concentration of raw materials. The programmed temperature experiment shows that the CO production in the process of coal spontaneous combustion is reduced by 38.09 %-52.78 % and the oxidation process of coal is inhibited by hydrogel.
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