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| Method research of acidithiobacillus ferrooxidans on removing surface components of waste mobile phone circuit board |
| ZHOU Nan1,2, BAI Jian-feng1,2, GU Wei-hua1,2, WANG Jian-wei1,2, MAO Shao-hua1,2, SONG Xiao-long1,2, YUAN Wen-yi1,2, ZhANG Cheng-long1,2, WANG Jing-wei1,2 |
1. Waste Electrical and Electronic Equipment(WEEE) Research Centre of Shanghai Polytechnic University, Shanghai 201209, China;
2. Shanghai Collaborative Innovation Centre for WEEE Recycling, Shanghai 201209, China |
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Abstract The printed circuit board (PCB) substrate and surface components of waste mobile phone were separated using biological method in this work. Then the optimum process conditions were explored. Acidithiobacillus ferrooxidans (A.f), was used to remove surface components of PCB. Results showed that a small number of PCB surface components were removed after 3days of bioleaching. After 5days of bioleaching, most of the surface components of PCB could be removed, but still some larger individual components were not removed. After 7days of bioleaching, the surface components of PCB were removed completely. Meanwhile, there were no any components removed from the surface of PCB in the non-innoculation treatment. The results of ICP-OES showed that high concentration of metals ions, which were contained in welding foot of the components, was in the lixivium after 7days of bioleaching. Among them, Ni, Zn and Al were bioleaching and entered into the lixivium with the form of ions. But the elemental Sn in the welding foot was oxidized to an ionic state into the lixivium through the action of A.f, then the Sn hydroxide precipitate was formed rapidly in the lixivium. After the first day of bioleaching, the concentration of Sn ion in the lixivium was decreased rapidly. Through single factor experiments by setting different leaching conditions, the results showed that when the initial pH of the medium was 1.0, the ratio of solid to liquid was 3:50, the inoculum(v/v) was 15%, the temperature was 30℃ and the rotating speed was 125r/min, A.f had the best effect on removing PCB surface components from the PCB. After 7days of bioleaching, the surface components of PCB were removed completely.
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Received: 25 March 2019
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