Effects of free cyanide and cuprous cyanide on the flotation of gold and silver bearing pyrite

Guo, Bao, Peng, Yongjun and Espinosa-Gomez, Rodolfo (2015) Effects of free cyanide and cuprous cyanide on the flotation of gold and silver bearing pyrite. Minerals Engineering, 71 194-204. doi:10.1016/j.mineng.2014.11.016


Author Guo, Bao
Peng, Yongjun
Espinosa-Gomez, Rodolfo
Title Effects of free cyanide and cuprous cyanide on the flotation of gold and silver bearing pyrite
Journal name Minerals Engineering   Check publisher's open access policy
ISSN 0892-6875
1872-9444
Publication date 2015-02
Year available 2014
Sub-type Article (original research)
DOI 10.1016/j.mineng.2014.11.016
Open Access Status
Volume 71
Start page 194
End page 204
Total pages 11
Place of publication Kidlington, Oxford United Kingdom
Publisher Pergamon Press
Collection year 2015
Language eng
Formatted abstract
At gold and silver mineral processing plants, cyanide species are always present in the process water recycled to flotation circuits, despite the cyanide destruction process. The effect of cyanide, in particular, cuprous cyanide on gold and silver flotation has not been well understood. In the present study, free cyanide and cuprous cyanide species were isolated and their effects on the flotation of a pyritic ore were evaluated. It was found that free cyanide depressed gold and silver flotation through their carrier, pyrite. Cuprous cyanide mainly in the form of Cu(CN)32− depressed pyrite flotation similarly as free cyanide. Electrochemical studies including open circuit potential (OCP), cyclic voltammetry and electrochemical impedance spectroscopy (EIS) techniques were carried out to understand the underpinning depression mechanism of cyanide species on pyrite flotation using xanthate as collector. It was found that all surface electrochemical reactions were inhibited by either free cyanide or cuprous cyanide. The surface layer as a result of xanthate adsorption on pyrite was completely removed in the presence of these cyanide species, which was suggested to contribute to the hydrophilic pyrite surface.
Keyword Cuprous cyanide
Pyrite
Flotation
Cyclic voltammetry
Electrochemical impedance spectroscopy
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Published online ahead of print 9 Dec 2014

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Chemical Engineering Publications
Official 2015 Collection
 
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