Effects of Site Karst Water on Fresh Coal Gangue at Baizhuang Coalfield, China—Leaching Characteristic

In mining areas where gangue is used for infill mining, Ordovician limestone karst water affected by discarded gangue, and the quality changes significantly. this study, effects of on change under different immersion solution conditions were evaluated Zhai Zhen Coal Mine, Hongqi Mine Limestone Karst Water, Baizhuang Mine. The results showed that cations in each group solutions had similar trends, Na+ concentration fluctuations greater with higher initial sodium ion concentrations, while calcium magnesium ions more obvious early stage immersion, gradually slowed down later stage. anions also have a fluctuation trend, but only immersion. By comparing three indexes (pH, TDS, ORP) solution, it was found highly mineralized good buffering effect basic index, ultrapure index low salinity greatest change. 100% stacked columnar plot between main chemical shows relative scale relationship components at period, significantly period (0–7 d), then enter are mainly SO42− ions. This study provides theoretical basis exploring to guidance groundwater pollution mechanisms closed coal mines.