Leaching of chalcopyrite with ferric ion. Part III: Effect of redox potential on the silver-catalyzed process

E. M. Córdoba, J. A. Muñoz, M. L. Blázquez, F. González, A. Ballester

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Resumen

This study examines the effect of redox potential on silver-catalyzed chalcopyrite leaching. Leaching tests were carried out in stirred Erlenmeyer flasks with 0.5 g chalcopyrite mineral, 1 g Ag/kg Cu and 100 mL of a sulphate solution of Fe3+/Fe2+ (with redox potential ranging between 300 and 600 mV Ag/AgCl) at pH 1.8, 180 rpm and 35°C or 68 °C. Unlike uncatalyzed leaching, an increase of the redox potential increased copper dissolution in the presence of silver ions, as the regeneration of Ag+ requires a high concentration of oxidizing agent, Fe3+. Additionally, the high reactivity of the mineral surface when silver was present could have been responsible for inhibiting the nucleation of hydrolysis products of Fe3+ on it. Excessive addition of silver transformed the chalcopyrite surface into copper-rich sulphides such as covellite, CuS, and geerite, Cu8S5, preventing the formation of CuFeS2/Ag2S galvanic couple and the recycling of silver ions.

Idioma originalInglés
Páginas (desde-hasta)97-105
Número de páginas9
PublicaciónHydrometallurgy
Volumen93
N.º3-4
DOI
EstadoPublicada - ago. 2008
Publicado de forma externa

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