The ultrasonically assisted metals recovery treatment of printed circuit board waste sludge by leaching separation
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- 作者：Fengchun Xie ; Haiying Li ; Yang Ma ; Chuncheng Li ; Tingting Cai ; Zhiyuan Huang ; Gaoqing Yuan
- 关键词：Ultrasound ; Metal recovery treatment ; Leaching separation ; PCB waste sludge
- 刊名：Journal of Hazardous Materials
- 出版年：2009
- 出版时间：15 October 2009
- 年：2009
- 卷：170
- 期：1
- 页码：430-435
- 全文大小：496 K
文摘
This paper provides a practical technique that realized industrial scale copper and iron separation from printed circuit board (PCB) waste sludge by ultrasonically assisted acid leaching in a low cost, low energy consumption and zero discharge of wastes manner. The separation efficiencies of copper and iron from acid leaching with assistance of ultrasound were compared with the one without assistance of ultrasound and the effects of the leaching procedure, pH value, and ultrasonic strength have been investigated in the paper. With the appropriate leaching procedure, a final pH of 3.0, an ultrasonic generator power of 160 W (in 1 l tank), leaching time of 60 min, leaching efficiencies of copper and iron had reached 97.83 % and 1.23 % , respectively. Therefore the separation of copper and iron in PCB waste sludge was virtually achieved. The lab results had been successfully applied to the industrial scaled applications in a heavy metal recovery plant in city of Huizhou, China for more than two years. It has great potentials to be used in even the broad metal recovery practices.