Recovery of Ag, Au, and Pt from Printed Circuit Boards by Pressure Leaching

Reclamation of printed circuit boards (PCBs) to recover metals is gaining growing attention due minerals being non-renewable resources. Currently, extraction from PCBs through an efficient and green method still under investigation. The present investigation concerns the recycling using hydrometallurgical processes. First, basic (Cu, Ni, Zn Fe) were separated a sulfuric acid solution at moderate temperatures. remaining solids characterized by SEM-EDS, whereby high content precious (Au, Ag Pt) was observed. In second stage, leached with HCl NaClO in 1-L titanium reactor varied oxygen pressure (0.2, 0.34 0.55 MPa), temperature (40, 50 80 °C) concentration (2 4 M), obtaining extractions above 95% [HCl] = M, P MPa T 40 °C. increased depending on HCl. Eh–pH diagrams for Ag–Cl–H2O, Au–Cl–H2O Pt–Cl–H2O constructed know possible species solution.