Bioleaching of copper from waste electronic scraps by cultures of Acidithiobacillus ferrooxidans and Acidithiobacillus thiooxidans
Bioleaching was used to mobilize copper from two kinds of electronic scraps used as raw materials for printed wire boards. The bacteria Acidithiobacillus ferrooxidans and Acidithiobacillus thiooxidans isolated from an acidic mine drainage were grown and acclimated in presence of the electronic scraps and used to solubilize copper from the samples. The experimental results demonstrated that the percentages of copper solubilized into the leaching solution from the electronic scraps basically increased with decrease of sieve fraction of the samples. Copper was almost solubilized into the leaching solution. Acidithiobacillus ferrooxidans has larger solubilizing capability for copper than Acidithiobacillus thiooxidans. The non-conductive green coating of the electronic scraps was proved to have little effect on the leaching efficiency of the pure culture of Acidithiobacillus ferrooxidans, the pure culture of Acidithiobacil thiooxidans or the mixed culture of Acidithiobacillus ferrooxidans and Acidithiobacillus thiooxidans. Variation of pH and redox potential of leaching solution with time implied that Fe3 + oxidized from Fe2 + in the culture medium in presence of Acidithiobacillus ferrooxidans caused the mobilization of copper. It is concluded that Acidithiobacillus ferooxidans and Acidithiobacillus thiooxidans were able to grow in the presence of the electronic scraps and the pure culture of Acidithiobacillus ferrooxidans, and the pure culture of Acidithiobacillus thiooxidans can bioleach copper from the electronic scraps.
bioleaching Acidithiobacillus ferrooxidans Acidithiobacillus thiooxidans electronic scraps copper
Jinqiu Xu Jianfeng Bai Jingwei Wang Bo Liang Jie Guan
School of Urban Development and Environmental Engineering, Shanghai Second Polytechnic University, 201209, Shanghai, China
国际会议
The 19th International Biohydrometallurgy Symposium(第19届国际生物湿法冶金大会 IBS2011)
长沙
英文
547-554
2011-09-18（万方平台首次上网日期，不代表论文的发表时间）