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| Gold Recovery from Waste Printed Circuit Boards in Thiocyanate-hydrogen Peroxide Systems |
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Received:July 29, 2014
Revised:July 30, 2014
Accepted:August 01, 2014
Published Online:December 24, 2014
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| DOI：10.3969/j.issn.1007-7545.2015.01.015 |
| KeyWord:thiocyanate; hydrogen peroxide; waste printed circuit boards; gold; silver |
| Author | Institution |
| WANG Zhi-ke |
河南师范大学环境学院 河南省环境污染控制重点实验室 |
| GUO Xiang |
河南师范大学环境学院 河南省环境污染控制重点实验室 |
| YE Cunling |
河南师范大学环境学院 河南省环境污染控制重点实验室 |
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| Abstract: |
| Gold and silver were recovered from waste printed circuit boards in thiocyanate-hydrogen peroxide systems. The effects of thiocyanate concentration, hydrogen peroxide concentration, pH value of solution, ratio of solid to liquid (S/L), temperature and stirring speed on leaching rates of Au and Ag were investigated. The results show that leaching rates of Au, Ag and Pb are 90% above, 79% above, and 9.7%, respectively under the optimum conditions including H2O2 concentration of 0.05 mol/L, thiocyanate concentration of 0.4 mol/L, S/L=1/250, stirring speed of 200 r/min, room temperature (~15 ℃) and leaching time of 8 h. |
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