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目的:了解采煤塌陷区水域中重金属含量以及煤、煤矸石在淋溶状态下金属的溶出状况,为合理利用矿区资源提供科学依据。方法:采集济宁市四个采煤塌陷区的水样,进行Pb、As、Cu、Cr6+含量的测定;并运用不同pH值淋溶液对原煤和煤矸石淋滤24 h后,测定4种重金属的含量。结果:铅和砷含量均高于地表水Pb和As含量均高于地表水Ⅲ类限值标准,Cr6+含量符合Ⅰ类限值,铜的含量符合Cu的含量符合Ⅱ类限值;煤和煤矸石中元素的析出量与淋溶液的pH有相关。结论:塌陷区水体受到铅塌陷区水体受到Pb、As砷的污染,煤和煤矸石通过淋溶能够形成环境的污染,相关部门应采取有效的治理和降解措施后,再进行综合开发利用。
OBJECTIVE: To understand the heavy metal content in coal mining subsidence area and the leaching status of coal and coal gangue in leaching state, so as to provide a scientific basis for rational utilization of ore resources. Methods: The water samples from four coal mining subsidence areas in Jining City were collected to determine the content of Pb, As, Cu and Cr6 +. After the leaching of raw coal and coal gangue by different pH leaching solution for 24 h, the contents of four heavy metals content. Results: Both Pb and As contents in surface water were higher than those in surface water. The content of Cr6 + conformed to the limit of class Ⅰ. The content of copper conformed to the content of Cu conforms to the limit of class Ⅱ. Coal and coal The amount of elements in the waste rock is related to the pH of the leachate. Conclusion: The water body in the subsidence area subject to lead subsidence is polluted by Pb, As and As, the coal and gangue can form environmental pollution by leaching, and relevant departments should take effective control and degradation measures before comprehensive development and utilization.