Surface characterisation,collector adsorption and flotation response of enargite in a redox potential controlled environment |
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| Affiliation: | 1. School of Chemical Engineering, The University of Queensland, Brisbane, Queensland 4072, Australia;2. CSIRO Process Science and Engineering, Box 312, Clayton, Victoria, Australia;1. Department of Metallurgical Engineering, Universidad de Concepcion, Chile;2. Water Research Centre for Agriculture and Mining (CRHIAM), Universidad de Concepcion, Chile;3. N.B. Keevil Institute of Mining Engineering, University of British Columbia, Canada;1. Instituto de Ingeniería, Universidad Nacional Autónoma de México, 04510, Ciudad de México, Mexico;2. Solar Energy Research Centre (CIESOL), Joint Centre University of Almería-CIEMAT, Ctra. de Sacramento s/n, 04120, Almería, Spain;3. Chemical Engineering Department, University of Almería, 04120, Almería, Spain;1. AMEC America Ltd., 2020 Winston Park Drive, Suite 700, Oakville, Ontario L6H 6X7, Canada;2. Cytec Industries, 1937 West Main Street, Stamford, CT 06904, USA;3. FLSmidth (Australia and South East Asia), 58-60 Dowd Street, Welshpool, WA 6986, Australia;4. Julius Kruttschnitt Mineral Research Centre, Sustainable Minerals Institute, University of Queensland, Isles Rd., Indooroopilly, Qld 4068, Australia;5. Barrick Gold Corporation, 161 Bay Street, Suite 3700, P.O. Box 212, Toronto, Canada |
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| 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. |
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| Keywords: | Arsenic Copper Xanthate Dithiophosphinate XPS Surface electrochemistry |
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