新庄孜矿塌陷区煤矸石中重金属迁移对覆土影响

The impact of heavy metals transfer from coal waste rock to soil in Xinzhuangzi subsidence area

针对淮南新庄孜矿覆土造地中煤矸石填充带来的重金属元素迁移污染进行了研究。结果表明:煤矸石中有毒元素Pb、As、Cd、Hg向覆土有一定迁移,且距离煤矸石越近的土壤中重金属含量明显增高;虽然覆土中重金属含量均超过淮南土壤的均值,但是该土壤中Pb、As和Cd含量均符合国家二级标准;其中土壤中Hg含量分别符合国家一级标准和二级标准。须对覆土中重金属元素进行跟踪研究。

The transfer contamination of heavy metals from coal waste rock to soil is studied in the Xingzhuanzi mining area, and the coal waste rock and overburden soil are treated with the method of digestion. The trace elements （Pb, As, Cd, Hg） in coal waste rock and soils were determined. The results indicated that： the toxic elements Pb, As, Cd, Hg of coal waste rock can transfer to soil. And the contents vary with the distance between the coal waste rock and soil. Although the heavy metal contents of soil are higher than the mean value of Huainan, the value is coincident with the second quality specification of China, as well as the content of Hg is coincident with the first and the second quality specification of China.