|
| Selective Leaching of Gold and Silver from Waste Printed Circuit Boards in Thiocyanate-Ferric System |
|
Received:April 13, 2013
Revised:April 16, 2013
Accepted:April 17, 2013
Published Online:October 25, 2013
|
| View Full Text View/Add Comment Download reader |
| DOI：10.3969/j.issn.1007-7545.2013.11.011 |
| KeyWord:thiocyanate; leaching; 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 |
| ZhANG Han |
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 Cun-ling |
河南师范大学环境学院 河南省环境污染控制重点实验室 |
|
| Hits: 2505 |
| Download times: 2898 |
| Abstract: |
| Gold and silver were selectively leached with thiocyanate process from residue obtained by H2SO4-H2O2 system to pretreat metallic fractions of waste printed circuit boards. The parameters of concentrations of thiocyanate and ferric, pH value, ratio of liquid to solid (L/S), stirring speed, temperature and leaching time were optimized. The results show that gold and silver extraction rate are 95% and 99% respectively and lead leaching rate does not exceeded 4.5% under the optimum conditions including concentration of Fe3 of 0.1 mol/L, concentration of SCN- of 0.6 mol/L, pH of 2, L/S=500/2, stirring speed of 200 r/min, temperature of 15 ℃, and leaching time of 8 h. |
| Close |
|
|
|