煤矸石自然风化及人工模拟风化过程中盐分及pH值的动态变化——以平朔露天矿区为例

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。

The Dynamic Change in Total Salt and pH Value of Coal Waste Rock in the process of Nature and Man-made Simulation Weathering——Taking Pingshuo Opencast Mine Area as An Example

In order to reveal the dynamic change of salinity and pH value in the process of physical decomposing and weathering,seventeen places were chosen,where the coal waste rock's particle size ranges from 0.1 to 10.0mm and the natural weathering in the earth's surface lasted for 5 and 14 years in Pingshuo opencast mine area of shanxi.We compared those with the control material,in which coal waster rock was treated by artificial fragmentation and particle size is 0.1-10.0mm.The results indicated that total salt of the coal waster rock weathering for 14 years was higher than that weathering for 5 years.The changing range of pH value of the coal waste rock from natural weathering was 6.36-9.20,while the pH value of the coal waste rock of artificial fragmentation was 7.26-7.95.The dipping experiment for 30 min,48 h and 96 h indicated that total salt showed an increase with the decreasing of the particle size for the same dipping time and the total salt was increased with dipping time with the same particle size.However,the pH value was decreased with decreasing particle size in the same dipping time.