Liu Yun-Guo, Zhou Ming, Zeng Guang-Ming, Li Xin, Xu Wei-Hua, Fan Ting
College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China.
J Hazard Mater. 2007 Mar 6;141(1):202-8. doi: 10.1016/j.jhazmat.2006.06.113. Epub 2006 Jul 1.
Mining of mineral ore and disposal of resulting waste tailings pose a significant risk to the surrounding environment. The objective of this work is to demonstrate the feasibility to remove heavy metals from mine tailings with the use of bioleaching and meanwhile to investigate the effect of solids concentration on removal of heavy metals from mine tailings by indigenous sulfur-oxidizing bacteria and the transformation of heavy metal forms after the bioleaching process. This work showed the laboratory results of bioleaching experiments on Pb-Zn-Cu mine tailings. The results showed that 98.08% Zn, 96.44% Cu, and 43.52% Pb could be removed from mine tailings by the bioleaching experiment after 13 days at 1% (w/v) solids concentration and the rates of pH reduction, ORP rise and sulfate production were reduced with the increase of solids concentration, due to the buffering capacity of mine tailing solids. The results also indicated that solid concentration 1% was found to be best to bacterial activity and metal solubilization of the five solids concentration tested (1%, 2%, 5%, 8% and 10%) under the chosen experimental conditions. In addition, the bioleaching had a significant impact on changes in partitioning of heavy metals.
矿石开采及由此产生的废尾矿处置对周边环境构成重大风险。这项工作的目的是证明利用生物浸出从矿山尾矿中去除重金属的可行性，同时研究固体浓度对本地硫氧化细菌从矿山尾矿中去除重金属的影响以及生物浸出过程后重金属形态的转变。这项工作展示了对铅锌铜矿尾矿进行生物浸出实验的实验室结果。结果表明，在固体浓度为1%（w/v）的情况下，经过13天的生物浸出实验，98.08%的锌、96.44%的铜和43.52%的铅可从矿山尾矿中去除，并且由于矿山尾矿固体的缓冲能力，随着固体浓度的增加，pH值降低、氧化还原电位升高和硫酸盐产生的速率降低。结果还表明，在所选择的实验条件下，在测试的五个固体浓度（1%、2%、5%、8%和10%）中，1%的固体浓度被发现最有利于细菌活性和金属溶解。此外，生物浸出对重金属的分配变化有显著影响。
