Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
582006 | Journal of Hazardous Materials | 2009 | 5 Pages |
Abstract
Oxidation leaching copper from metal powders of waste printed circuit boards (PCBs) was conducted at room temperature in sulfuric acid solution. The result showed that the copper in metal powders was oxidized by Cu2+ to form CuCl2â in the presence of chloride ion without electrochemical oxidation. Then, CuCl2â was oxidized into CuSO4 by oxygen derived from the air insufflated into leaching solution. The leaching rate of copper reached 100%. The whole reaction took 5.5 h because it was limited by the low solubility of the air in water. In the electro-oxidation conditions, the chloride ion was electro-oxidized into ClOâ, which oxidized CuCl2â into CuSO4 and ClOâ was reduced into Clâ itself again at the same time. Since Clâ was recycled in the solution not only as a complexing agent but also as an oxidant, which made the reaction speed up to 3.5 h to reach 100% leaching rate. Leaching solution was concentrated to crystallize CuSO4·5H2O, and crystal liquor was reused to leach copper from metal powders.
Keywords
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Chemical Health and Safety
Authors
Zhu Ping, Fan ZeYun, Lin Jie, Liu Qiang, Qian GuangRen, Zhou Ming,