广西环江尾矿重金属形态及其潜在迁移能力分析

以广西环江地区某尾矿库3个区域的尾矿样品为研究对象,在化学成分和矿物成分分析的基础上,运用Dold七步分级化学提取法,研究了Zn,Cd,Pb,As,Sb和Ni 6种重金属的赋存形态特征,并分析了其潜在迁移能力。结果表明,3个区域的尾矿样品均为碳酸盐型金属硫化物尾矿,样品中Zn和Pb的质量浓度较高(分别达4 119.9 mg/kg和3 375.1 mg/kg),Cd和Ni的质量浓度相对较低,As和Sb的质量浓度差别较大(可达191.5 mg/kg和86.5 mg/kg)。形态分析结果表明,Zn和As的迁移性较强,且具有一定的环境风险,Pb,Cd,Sb和Ni相对较稳定。

Analysis on Heavy Metals Species and Their Potential Migration in Guangxi Huanjiang Tailings

Three tailing samples were collected from Huanjiang mine ,Guangxi Province in this study .Based on chemical and mineral composition analysis ,Dold seven-stage sequential extraction procedure was applied to conduct studies on the species characteristics and potential migration ability of 6 heavy metals ,including Zn ,Cd ,Pb ,As ,Sb and Ni .The results showed that three samples were all carbonate -sulfide heavy metal tailings ,in which the concentrations of Zn and Pb were much higher in samples (4 119 .9 mg/kg and 3 375 .1 mg/kg respectively ) ,those of Cd and Ni were relatively lower and the difference of As and Sb concentrations were excessively large (high to 191 .5 mg/kg and 86 .5 mg/kg respectively ) .Zn and As had stronger migration ability and certain environmental risks ,but Pb ,Cd ,Sb and Ni were relatively stable .