为了解昌江铅锌矿尾矿库区重金属组成特征及纵向迁移规律,在研究区尾矿库均匀选择6个深钻孔,分层采集了深度为0～15.4 m的土壤和岩石样品,以及在尾矿库区周边土地选择6个浅钻孔,采集了 0～1.3 m 土壤样品,分析了尾矿库区重金属组成特征及纵向迁移规律.结果表明:1)研究区尾矿库表层土壤中Cu、Zn、Cd和Pb 4元素的平均含量严重偏高,尤其是Zn、Cd和Pb;2)研究区尾矿库土壤主要受到Cd、Pb和Zn的污染,且污染深度已达到了 5.8 m;3)尾矿库土壤层及其外围土地表层土壤中Cd、Zn和Pb元素含量较高与尾矿库区堆放过大量的矿渣、尾矿和选矿场废弃物等有密切关系;4)尾矿库外围土地表层土壤重金属含量低于尾矿库表层土壤,但Cd、Zn和Pb元素含量仍然较高.如研究区尾矿库外围土地要作为保障农业生产的土地使用,需对其重金属进行治理.
Vertical pollution characteristic of heavy metals of soil in the tailings reservoir area of Pb-Zn mining of Changhua
In order to understand the composition and longitudinal migration of heavy metals in the tailings reservoir area of Changjiang lead-zinc mine,six deep boreholes are evenly selected in the tailings pond in the study area.Soil and rock samples were collected in layers at depths of 0 to 15.4 m,in addition,six shallow boreholes were selected in the surrounding land of the tailings pond area and soil samples ranging from 0 to 1.3 m were collected.The composition characteristics and longitudinal migration of heavy metals in the tailings reservoir area are analyzed.The results show that:1)The average contents of Cu,Zn,Cd and Pb in the surface soil of tailings pond in the study area are seriously high,especially Zn,Cd and Pb;2)The soil of the tailings pond in the study area is mainly polluted by Cd,Pb and Zn,and the pollution depth has reached 5.8 m;3)The high content of Cd,Zn and Pb in the soil layer and the surface soil surrounding the tailings reservoir is closely related to the large amount of slag,tailings and waste in the tailings reservoir area;4)The heavy metal content in the surface soil of the peripheral land of the tailings pond is lower than that of the surface soil of the tailings pond.But the contents of Cd,Zn and Pb are still high.If the peripheral land of tailings pond in the study area is to be used as land to ensure agricultural production,it is necessary to control its heavy metals.
Tailings reservoir area of lead-zinc minesoilheavy metalsvertical pollution characteristic
NETL
NSTL
万方数据
