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The effect of silver on the acidic ferric sulfate leaching of primary copper sulfides under recycle solution conditions observed in heap leaching. Part 3: Surface characterization

Tapera, T. and Nikoloski, A.N. (2019) The effect of silver on the acidic ferric sulfate leaching of primary copper sulfides under recycle solution conditions observed in heap leaching. Part 3: Surface characterization. Hydrometallurgy, 183 . pp. 130-141.

Link to Published Version: https://doi.org/10.1016/j.hydromet.2018.12.004
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Abstract

The surface products formed on chalcopyrite during leaching in sulfate solutions in the presence of various additives were investigated. A combination of SEM, EDS, TEM, FIB and XRD was used to characterize the surface products formed under different leaching conditions. The influence of additives such as ethylene glycol, wetting agent and chloride ions, in both the presence and absence of silver ions, on the type of surface products formed was investigated. In the presence of both silver ions and ethylene glycol, metallic silver in the form of nanoparticles was formed and deposited on the surface. The silver nanoparticles were predominantly cubic in shape and had varying dimensions up to 500 nm. The metallic silver formation is aided by the reduction of silver ions with ethylene glycol in the sulfate media. The deposition of metallic silver on the chalcopyrite surface in turn enhances the leaching of the chalcopyrite by improving the surface conductivity. In the presence of low dosages of chloride ions, large quantities of elemental sulfur were formed. Increasing the concentration of chloride ions reduced the extent of sulfur formation. The elemental sulfur formed in the presence of chloride ions was found to be porous. In the presence of a wetting agent, the formation of elemental sulfur was again observed, both in the presence and absence of silver, but its influence on the leaching process may be less.

Item Type: Journal Article
Murdoch Affiliation: School of Engineering and Information Technology
Publisher: Elsevier BV
Copyright: © 2018 Elsevier B.V.
URI: http://researchrepository.murdoch.edu.au/id/eprint/42886
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