Fundamental electrochemical and Raman spectroscopic investigations of the flotation behaviour of PtAs2 |
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| Affiliation: | 1. Surface Science Western, Research Park, University of Western Ontario, London, Ont. N6G0J3, Canada;2. Department of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China;1. College of Chemistry and Chemical Engineering, Baoji University of Arts and Sciences, Baoji 721013, China;2. Department of Physics and Information Technology, Nonlinear Research Institute, Baoji University of Arts and Sciences, Baoji 721016, China;1. Niederrhein University of Applied Sciences, Faculty of Chemistry, Adlerstr. 32, 47798 Krefeld, Germany;2. Universität Duisburg-Essen, Lehrstuhl für Technische Chemie II, Universitätsstr. 7, 45141 Essen, Germany |
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| Abstract: | Platinum arsenide minerals are important platinum carriers in altered platinum reserves such as the Great Dyke of Zimbabwe and the Platreef (in the Bushveld Complex of South Africa). Industrial mineralogical investigations suggest these minerals to be poorly recovered during froth flotation and are believed to be slow floating. In this work, electrochemical investigations, electrochemical contact angle measurements and Raman spectroscopy have been employed to investigate the interaction of ethyl xanthate with synthetic PtAs2. The electrochemical investigations suggest a strong interaction of the xanthate with the mineral at potentials higher than the reversible potential of the xanthate–dixanthogen couple. Raman spectroscopy has confirmed the presence of dixanthogen on the mineral surface when the surfaces are anodically polarized. Contact angle investigations indicated the surface to be hydrophobic; possible mechanisms of the slow floating behaviour are discussed. |
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