The interaction between copper species and pyrite surfaces in copper cyanide solutions

Guo, Bao and Peng, Yongjun (2017) The interaction between copper species and pyrite surfaces in copper cyanide solutions. International Journal of Mineral Processing, 158 85-92. doi:10.1016/j.minpro.2016.11.021

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Author Guo, Bao
Peng, Yongjun
Title The interaction between copper species and pyrite surfaces in copper cyanide solutions
Journal name International Journal of Mineral Processing   Check publisher's open access policy
ISSN 0301-7516
Publication date 2017-01-10
Year available 2016
Sub-type Article (original research)
DOI 10.1016/j.minpro.2016.11.021
Open Access Status File (Author Post-print)
Volume 158
Start page 85
End page 92
Total pages 8
Place of publication Amsterdam, Netherlands
Publisher Elsevier BV
Language eng
Subject 1909 Geotechnical Engineering and Engineering Geology
1906 Geochemistry and Petrology
Abstract The adsorption of copper ions and the formation of a copper sulfide phase on pyrite surfaces are of vital importance to alter the surface property of pyrite and determine its fate either to be rejected in the flotation of polymetallic sulfide ores or to be recovered in the flotation of pyritic gold ores. Cyanide and copper may co-exist in the process water with complicated speciation. The objective of this study is to understand the interaction between copper cyanide species and pyrite and clarify the possible adsorption of copper on pyrite surfaces from cyanide-bearing solutions. Surface-enhanced Raman spectroscopy and electrochemical measurements were used to determine the reaction products formed on pyrite surfaces. It was found that Cu(I)-bearing species were incorporated into pyrite, forming a CuS-like sulfide from copper cyanide solutions at a more oxidizing potential, while a Cu2S-like sulfide formed at a more reducing potential. The amount of copper deposited on pyrite was significantly improved at a more reducing potential at which the pyrite surface tended to be FeS-like. In addition, these Cu(I)-sulfides on pyrite surfaces were dissolved by cyanide-bearing species at a high CN/Cu ratio, compromising the total amount of copper uptake.
Keyword Copper adsorption
Copper cyanide
Redox products
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Chemical Engineering Publications
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