Bioleaching of metal concentrates of waste printed circuit boards by mixed culture of acidophilic bacteria.
Bioleaching of metal concentrates of waste printed circuit boards by mixed culture of acidophilic bacteria.
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DOI：
10.1016/j.jhazmat.2011.05.062
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发表时间：
2011-08
影响因子：
13.6
通讯作者：
Nengwu Zhu;Yun Xiang;Ting Zhang;Ping-xiao Wu;Z. Dang;Ping Li;Jinhua Wu
中科院分区：
文献类型：
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作者：
Nengwu Zhu;Yun Xiang;Ting Zhang;Ping-xiao Wu;Z. Dang;Ping Li;Jinhua Wu
印刷电路板的金属浓缩物是去除非金属成分的有价金属残留物。非金属成分在细菌浸出过程中表现出细菌毒性，并且可以回收利用。研究了初始pH、初始Fe(II)浓度、金属精矿投加量、颗粒大小和接种量对细菌浸出效果的影响，确定了嗜酸菌混合培养法浸出金属精矿的最佳条件，并对其可行性进行了评价。结果表明，初始pH和Fe(II)浓度对铜的提取和沉淀物的形成有重要影响。在初始pH为2.00、初始Fe(II)为12g/L、金属精矿用量为12g/L、接种量为10%、粒度为60~80目的优化条件下，铜的浸出率在45h内达到96.8%，铝和锌的浸出率在98h内分别达到88.2%和91.6%。结果表明，MCAB能有效地从废印刷电路板的金属精矿中浸出金属，浸出周期由原来的8d左右缩短到45h左右。
Metal concentrates of printed circuit boards (PCBs) are the residue valuable metals from which non-metallic components are removed. The non-metallic components show bacterial toxicity in bioleaching process and can be recycled as well. In this study, the effects of initial pH, initial Fe(II) concentration, metal concentrate dosage, particle size, and inoculation quantity on the bioleaching were investigated so as to determine the optimum conditions and evaluate the feasibility of bioleaching of metal concentrates of PCBs by mixed culture of acidophilic bacteria (MCAB). The results showed that the initial pH and Fe(II) concentration played an important role in copper extraction and precipitate formation. Under the optimized conditions of initial pH 2.00, 12g/L initial Fe(II), 12g/L metal concentrate dosage, 10% inoculation quantity, and 60–80 mesh particle size, 96.8% the copper leaching efficiency was achieved in 45h, and aluminum and zinc 88.2% and 91.6% in 98h, respectively. All findings demonstrated that metals could be efficiently leached from metal concentrates of waste PCBs by using the MCAB, and the leaching period was shorten from about 8 days to 45h.