铅锌尾矿重金属释放影响因素的探讨

Investigation on factors affecting the release of heavy metals in lead and zinc tailings waste

铅锌尾矿废渣若不经过处理,会通过风蚀、径流对环境造成重金属污染,对尾矿废渣污染的研究一直是大家关注的方向。多年来,p H被证实是影响重金属释放的重要因素。本文通过实验,研究了浸提方法、pH和盐度对铅锌尾矿废渣重金属元素释放的影响。结果表明,Pb、Zn、Cd、As在pH值呈酸性和碱性时浸出率都较高,Cu、Ni则在pH值为碱性时浸出率更高,盐度对Pb的释放影响效果更为明显。

Lead and Zinc tailings waste if not treated,can cause heavy metal pollution of the environment through wind erosion or run-off.Research on tailings waste slag pollution has always been the direction of interest.Over the years,pH has proven to be an important factor affecting the release of heavy metals.In this paper,the effects of extraction method,p H and salinity on the heavy metal elements released from lead and zinc tailings residue were studied.The results show that Pb,Zn,Cd and As have higher leaching rate when the pH is acidic and alkaline.Cu and Ni have higher leaching rate when the pH is alkaline.The effect of salinity on Pb release is more effective.