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| Coal gangue is one of the largest industrial waste residue in China, which not only takes up much of the farmland , but also releases a large number of harmful elements, such as the heavy metals, with the effect of weathering, decomposition and leaching, causing serious water, air and soil pollution. We took the gangue of Jining coal mine Ⅲ as the object, carrying out the leaching experiment with the simulated acid water of the study zone，That was directing significance for prevention and cure job of environmental pollution. The results showed that: (1) The contents of Cr and Cd in the gangue were in excess of the Third Class of Environmental Quality Standars for Soil. The largest concentrations of Cr, Pb and Cd in the filtrate water were in excess of the Third Class of Environmental Quality Standards for Surface Water (2) For the largest release , the number of metal Cr was largest, followed by Zn, Pb, Cu, a relatively small amount of Cd and Mn, similar to the old gangue and the new gangue. For the largest release rate, the number of Cd was largest in the new gangue, secondly for Cr, next smaller for Pb, Zn and Cu and Mn almost zero; In the old gangue, Cr appeared first, followed by Pb, Zn and Cu, Cd was relatively smaller and practically nil of Mn. |
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| Keywords:Coal Gangue;Heavy Metals;Leaching Experiment;the Largest Release |
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