Kasper Angela C, Carrillo Abad Jordi, García Gabaldón Montserrat, Veit Hugo M, Pérez Herranz Valentín
LACOR-PPGE3M, Universidade Federal do Rio Grande do Sul, Rio Grande do Sul, Brazil
Departamento de Ingeniería Química y Nuclear, Universidad Politécnica de Valencia, Valencia, Spain.
Waste Manag Res. 2016 Jan;34(1):47-57. doi: 10.1177/0734242X15607425. Epub 2015 Oct 5.
The use of electrochemical techniques in the selective recovery of gold from a solution containing thiosulphate, ammonia, and copper, obtained from the leaching of printed circuit boards from mobile phones using ammoniacal thiosulphate, are shown in this work. First, cyclic voltammetry tests were performed to determine the potential of electrodeposition of gold and copper, and then, electrowinning tests at different potentials for checking the rates of recovery of these metals were performed. The results of the cyclic voltammetry show that copper deposition occurs at potentials more negative than -600 mV (Ag/AgCl), whereas the gold deposition can be performed at potentials more positives than -600 mV (Ag/AgCl). The results of electrowinning show that 99% of the gold present in solutions containing thiosulphate and copper can be selectively recovered in a potential range between -400 mV (vs Ag/AgCl) and -500 mV (vs Ag/AgCl). Furthermore, 99% of copper can be recovered in potentials more negative than -700 mV (vs Ag/AgCl).
本文展示了电化学技术在从含有硫代硫酸盐、氨和铜的溶液中选择性回收金方面的应用，该溶液是通过使用氨性硫代硫酸盐浸出手机印刷电路板获得的。首先，进行循环伏安法测试以确定金和铜的电沉积电位，然后，在不同电位下进行电解沉积测试以检查这些金属的回收率。循环伏安法的结果表明，铜在比 -600 mV（Ag/AgCl）更负的电位下发生沉积，而金可以在比 -600 mV（Ag/AgCl）更正的电位下进行沉积。电解沉积的结果表明，在含有硫代硫酸盐和铜的溶液中，99% 的金可以在 -400 mV（相对于 Ag/AgCl）至 -500 mV（相对于 Ag/AgCl）的电位范围内被选择性回收。此外，99% 的铜可以在比 -700 mV（相对于 Ag/AgCl）更负的电位下被回收。
