金矿尾渣中铜的电动修复

Electrokinetic remediation of gold mine tailings polluted with copper

以云南省大理白族自治州鹤庆县北衙金矿尾渣为研究对象,采用电动修复技术,研究了不同的阳极工作液、不同的可渗透反应材料(PRB)和不同的可渗透反应材料放置位置对矿渣中铜的去除率的影响,分析了尾矿中铜的形态分布及修复技术对不同形态铜的去除情况。矿渣中水溶态的铜含量占总含铜量的0.7%,弱酸可提取态占5.8%,铁锰氧化物结合态占40.9%,有机物及硫化物结合态占9.7%,残渣态占42.9%。结果表明,阳极工作液为0.1mol/L柠檬酸溶液、PRB为椰壳活性炭并置于距阳极10cm处时,近阳极区矿渣中水溶态的铜去除率为66.5%,弱酸可提取态铜的去除率为51.5%,铁锰氧化物结合态铜的去除率为58.5%,而电动修复对有机物及硫化物结合态和残渣态的铜几乎没有效果。

In this paper,the gold mine tailings collected from Dali Bai autonomous,Heqing prefecture,Yunnan province,China were investigated by electrokinetic remediation. The effect of different anode electrode solution,permeable reactive barrier（PRB） materials and placement of the PRB on the removal rate of copper was studied. The morphological changes of copper in the electrokinetic remediation were also investigated. The percent of water soluble species,acid extractable fraction,Fe-Mn oxides species,organic matter species and residual species in total copper content were 0.7%,5.8%,40.9%,9.7%,and 42.9% respectively. The results indicated that the removal rate of water soluble species,acid extractable fraction,Fe-Mn oxides species can reach 66.5%,51.5% and 58.5% respectively when the anode electrode solution was 0.1mol/L citric acid solution and the PRB was coconut shell activated carbon and placed in 10 cm away from the anode. Unfortunately there was almost no effect about organic matter species and residual species of copper. However,there were few reports about the research on electrokinetic remediation of mine tailings. This study can provide a reference for related research.