Recovery of ag, au, and pt from printed circuit boards by pressure leaching

Guadalupe Martinez-Ballesteros, Jesus Leobardo Valenzuela-García*, Agustin Gómez-Alvarez, Martin Antonio Encinas-Romero, Flerida Adriana Mejía-Zamudio, Aaron de Jesús Rosas-Durazo, Roberto Valenzuela-Frisby

*Autor correspondiente de este trabajo

Resultado de la investigación: Contribución a una revistaArtículorevisión exhaustiva


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

Idioma originalInglés
Número de artículo67
EstadoPublicada - dic 2021

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© 2021 by the authors. Licensee MDPI, Basel, Switzerland.


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