Jujun Ruan, Jie Zheng, Jian Hu, Zhang Jianwen
School of Environmental Science and Engineering, Sun Yat-Sen University, Guangzhou, People's Republic of China.
School of Environmental Science and Engineering, Yangzhou University, Yangzhou, People's Republic of China.
Sci Rep. 2015 Aug 28;5:13481. doi: 10.1038/srep13481.
For recovering precious metals from waste printed circuit boards (PCBs), a novel hybrid technology including physical and biological methods was developed. It consisted of crushing, corona-electrostatic separation, and bioleaching. Bioleaching process is the focus of this paper. A novel bioreactor for bioleaching was designed. Bioleaching was carried out using Pseudomonas chlororaphis. Bioleaching experiments using mixed particles of Au and Cu were performed and leachate contained 0.006 mg/L, 2823 mg/L Au(+) and Cu(2+) respectively. It showed when Cu existed, the concentrations of Au were extremely small. This provided the feasibility to separate Cu from Au. The method of orthogonal experimental design was employed in the simulation bioleaching experiments. Experimental results showed the optimized parameters for separating Cu from Au particles were pH 7.0, temperature 22.5 °C, and rotation speed 80 r/min. Based on the optimized parameters obtained, the bioreactor was operated for recovering mixed Au and Cu particles. 88.1 wt.% of Cu and 76.6 wt.% of Au were recovered. The paper contributed important information to recover precious metals from waste PCBs.
为了从废弃印刷电路板（PCBs）中回收贵金属，开发了一种包括物理和生物方法的新型混合技术。它包括粉碎、电晕静电分离和生物浸出。生物浸出过程是本文的重点。设计了一种用于生物浸出的新型生物反应器。使用绿针假单胞菌进行生物浸出。进行了使用金和铜混合颗粒的生物浸出实验，浸出液中分别含有0.006mg/L的金离子和2823mg/L的铜离子。结果表明，当有铜存在时，金的浓度极低。这为从金中分离铜提供了可行性。在模拟生物浸出实验中采用了正交实验设计方法。实验结果表明，从金颗粒中分离铜的优化参数为pH值7.0、温度22.5°C和转速80r/min。基于获得的优化参数，操作生物反应器以回收混合的金和铜颗粒。回收了88.1wt.%的铜和76.6wt.%的金。本文为从废弃印刷电路板中回收贵金属提供了重要信息。
