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为揭示煤矸石初期物理崩解风化过程中盐分和pH值的动态变化规律,选择了山西平朔露天矿区17处暴露地表自然风化5年和14年粒径为0.1～10.0mm的风化煤矸石,以及经过人工破碎粒径也为0.1～10.0mm的新鲜煤矸石为对比材料。研究结果表明:自然风化14年左右的煤矸石全盐量高于风化5年左右的煤矸石。自然风化煤矸石pH值的变化幅度为6.55～9.20,人工破碎新鲜煤矸石的pH值为7.26～7.95。人工破碎新鲜煤矸石30min、48h、96h浸水试验结果表明,同一浸泡时间含盐量随着粒径缩小而升高,同一粒径随着浸泡时间的延长而变大;同一浸泡时间pH值随着粒径缩小而降低,同一粒径随着浸泡时间的延长也变大;风化煤矸石的pH值和全盐含量>新鲜煤矸石。
In order to reveal the dynamic changes of salt content and pH value in the process of coal gangue initial physical disintegration and weathering, we selected 17 weathering coal gangues with surface natural weathering of 17 years and 14 years of grain size of 0.1 ~ 10.0mm in Pingshuo open pit, Shanxi Province, As well as fresh coal gangue, which is also 0.1 ~ 10.0mm in size, after artificial broken. The results show that the total salt content of coal gangue, which is naturally weathered for about 14 years, is higher than that of coal gangue, which is weathered for about 5 years. The change range of pH of naturally weathered gangue is 6.55 ~ 9.20, and the pH value of artificially broken fresh coal gangue is 7.26 ~ 7.95. The results showed that the salt content in the same soaking time increased with the decrease of the particle size, and the same particle size became larger with the soaking time. The pH value of the same soaking time increased with the Particle size decreases and decreases, the same particle size with the extension of soaking time also becomes larger; weathered coal gangue pH and total salt content> fresh gangue.