Journal
MINERALS
Volume 8, Issue 1, Pages -Publisher
MDPI
DOI: 10.3390/min8010004
Keywords
co-bioleaching; chalcopyrite; bornite; galvanic interaction; silver-catalyzed
Funding
- Provincial Science and Technology Leaders (Innovation team of interface chemistry of efficient and clean utilization of complex mineral resources) [2016RS2016]
- Co-Innovation Centre for Clean and Efficient Utilization of Strategic Metal Mineral Resources
- Innovation Driven Plan of Central South University [2015CX005]
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Chalcopyrite and bornite are two important copper minerals, and they often coexist. In this study, the co-bioleaching of chalcopyrite and silver-bearing bornite by mixed moderately thermophilic culture at 50 degrees C was investigated. The bioleaching results show that the extraction percentage of Cu for co-bioleaching of chalcopyrite (Ccp) and silver-bearing bornite (Bn) (Ccp/Bn = 3:1) was 94.6%. Compared to bioleaching of chalcopyrite or silver-bearing bornite alone, the Cu extraction percentage was greatly enhanced when they were bioleached together. The leaching residues were characterized by X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). Silver-bearing bornite dissolved preferentially compared to chalcopyrite, due to galvanic interactions. Simultaneously, Ag+ was released from the silver-bearing bornite into solution. Ag2S formed on the surface because Cu and Fe in the chalcopyrite were replaced by Ag+, accelerating chalcopyrite dissolution and enrichment of Ag on the surface of the chalcopyrite.
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