Surface characterisation, collector adsorption and flotation response of enargite in a redox potential controlled environment

Plackowski, Chris, Bruckard, Warren J. and Nguyen, Anh V. (2014) Surface characterisation, collector adsorption and flotation response of enargite in a redox potential controlled environment. Minerals Engineering, 65 61-73. doi:10.1016/j.mineng.2014.05.013


Author Plackowski, Chris
Bruckard, Warren J.
Nguyen, Anh V.
Title Surface characterisation, collector adsorption and flotation response of enargite in a redox potential controlled environment
Journal name Minerals Engineering   Check publisher's open access policy
ISSN 0892-6875
1872-9444
Publication date 2014-10-15
Year available 2014
Sub-type Article (original research)
DOI 10.1016/j.mineng.2014.05.013
Open Access Status
Volume 65
Start page 61
End page 73
Total pages 13
Place of publication Kidlington, Oxford, United Kingdom
Publisher Pergamon Press
Collection year 2015
Language eng
Abstract We previously investigated oxidation of the surface of natural enargite (Cu3AsS4) under potentiostatic control and the formation of oxidation species at the mineral surface at selected applied potentials in the oxidative range. Here we further extended the research by incorporating flotation collectors into the system. Electrochemical techniques, X-ray photoelectron spectroscopy (XPS) and microflotation in a redox potential controlled environment were applied to examine surface properties, collector adsorption and flotation response of enargite in pH 10 solutions of sodium ethyl xanthate (SEX) and sodium dialkyl dithiophosphinate (3418A). The spectral details of XPS analysis of electrochemically treated enargite surfaces show significant adsorption of SEX and 3418A collectors onto enargite at an applied voltage of +516 mV, but no adsorption of both collectors at -400 mV. The results of XPS analysis agree with the floatability of enargite determined by microflotation, showing that the flotation recovery was highest at high oxidative potential (+516 mV), then decreased at low oxidative potential (+100 mV) and was very poor at -400 mV. These results confirm that enargite floatability can be efficiently controlled electrochemically.
Keyword Arsenic
Copper
Dithiophosphinate
Surface electrochemistry
Xanthate
XPS
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

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