Electrochemical and spectroscopic studies of pyrite-cyanide interactions in relation to the depression of pyrite flotation

Guo, Bao, Peng, Yongjun and Parker, Gretel (2016) Electrochemical and spectroscopic studies of pyrite-cyanide interactions in relation to the depression of pyrite flotation. Minerals Engineering, 92 78-85. doi:10.1016/j.mineng.2016.03.003


Author Guo, Bao
Peng, Yongjun
Parker, Gretel
Title Electrochemical and spectroscopic studies of pyrite-cyanide interactions in relation to the depression of pyrite flotation
Journal name Minerals Engineering   Check publisher's open access policy
ISSN 0892-6875
1872-9444
Publication date 2016-06-01
Year available 2016
Sub-type Article (original research)
DOI 10.1016/j.mineng.2016.03.003
Volume 92
Start page 78
End page 85
Total pages 8
Place of publication Doetinchem, The Netherlands
Publisher Elsevier
Collection year 2017
Language eng
Subject 1909 Geotechnical Engineering and Engineering Geology
2210 Mechanical Engineering
1600 Chemistry
2207 Control and Systems Engineering
Formatted abstract
Cyanide is the most commonly used depressant to reject pyrite as a gangue mineral at alkaline pH in differential flotation. However, the depression mechanism of cyanide still remains uncertain. The depression effect has been proposed as the preferential adsorption of cyano species on pyrite, which has, however, not been confirmed experimentally. It is also believed that cyanide inhibits the chemisorption of thiol collectors due to the decrease of surface redox potential. In order to clarify the controversial depression mechanisms, the interactions between pyrite and cyanide at pH 10 were investigated in this study. Preferential adsorption of cyanide on pyrite rather than the decrease of surface redox potential was determined to be the depression contributor. Surface cyanoferric species were identified, both electrochemically and spectroscopically, on pyrite surface in the presence of cyanide, inhibiting the oxidation of pyrite and the oxidation/chemisorption of xanthate. This study provides new insights into the depression of pyrite flotation by cyanide.
Keyword Depression
Flotation
Free cyanide
Pyrite
Redox potential
Surface reaction
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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