Effect of solids concentration on removal of heavy metals from mine tailings via bioleaching

被引:70
作者
Liu, Yun-Guo [1 ]
Zhou, Ming [1 ]
Zeng, Guang-Ming [1 ]
Li, Xin [1 ]
Xu, Wei-Hua [1 ]
Fan, Ting [1 ]
机构
[1] Hunan Univ, Coll Environm Sci & Engn, Changsha 410082, Peoples R China
关键词
bioleaching; mine tailings; heavy metal; solids concentration; partitioning;
D O I
10.1016/j.jhazmat.2006.06.113
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
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. (c) 2006 Elsevier B.V All rights reserved.
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页码:202 / 208
页数:7
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