Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1636721 | Transactions of Nonferrous Metals Society of China | 2015 | 9 Pages |
Abstract
X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) analyses were carried out to investigate the surface species and interfacial reactions during bioleaching of chalcopyrite by different strains of moderately thermophilic bacteria (45 °C). Results show that monosulfide (CuS), disulfide (S22-), polysulfide (Sn2-), elemental sulfur (S0) and sulfate (SO42-) are the main intermediate species on the surface of chalcopyrite during bioleaching by A. caldus, S. thermosulfidooxidans and L. ferriphilum. The low kinetics of dissolution of chalcopyrite in A. caldus can be mainly attributed to the incomplete dissolution of chalcopyrite and the passivation layer of polysulfide. Polysulfide and jarosite should be mainly responsible for the passivation of chalcopyrite in bioleaching by L. ferriphilum or S. thermosulfidooxidans. However, elemental sulfur should not be the main composition of passivation layer of chalcopyrite during bioleaching.
Related Topics
Physical Sciences and Engineering
Materials Science
Metals and Alloys
Authors
Hong-bo ZHAO, Jun WANG, Wen-qing QIN, Xi-hua ZHENG, Lang TAO, Xiao-wen GAN, Guan-zhou QIU,