Bioleaching of Waste Printed Wiring Board Using Acidithiobacillus ferrooxidans
| Autor: | Wataru Hareyama, Yasuo Kudo, Hiroshi Nakazawa, Shouming Wu |
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| Rok vydání: | 2009 |
| Předmět: | |
| Zdroj: | Journal of MMIJ. 125:43-48 |
| ISSN: | 1884-0450 1881-6118 |
| Popis: | In order to recover copper from waste printed wiring boards which were free of mounted parts, bioleaching experiments of the boards were carried out using Acidithiobacillus ferrooxidans in shaking flasks. The size fraction and the copper content of the sample mainly used were -3.5+8mesh and 34.1% respectively. In the preliminary study using metal copper powder, the dissolution of copper was accelerated with the addition of ferric iron in the bioleaching while not in the absence of ferric iron. Ferric iron oxidized metal copper to give copper ions, and Acidithiobacillus ferrooxidans oxidized ferrous iron, promoting dissolution of metal copper. The dissolution rate of copper increased with increase in the initial concentration of ferric iron in the bioleaching of the waste printed wiring board. After the bioleaching of 125 hours, 72% of copper was dissolved with initial ferric ion concentration of 600mg/L, which was approximately three times as much as that without ferric iron. |
| Databáze: | OpenAIRE |
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