| Abstract Scope |
Printed circuit board (PCB) is the essential part of electronic products and contains a variety of metallic and non-metallic elements. Our data yields a market value of approximately $15,800 / tonne of waste printed circuit boards. In this study, selective leaching of valuable metals from PCBs was performed in a bromine-sodium bromide solution system. The effects of different parameters such as bromine concentration, sodium bromide concentration, temperature, and solid/liquid ratio on the leaching performance were investigated. The results show that the most influential factors are the concentrations of bromine and sodium bromide. More than 95% of copper, silver, lead, gold and nickel could be dissolved under the conditions: 50g/L solid/liquid ratio, 2.4kg NaBr/kg PCBs, 0.8L Br2/kg PCBs, 1L HCl/kg PCBs, 400RPM agitation speed and 23.5 °C for 10 hours. |