Impact of gypsum supersaturated water on the uptake of copper and xanthate on sphalerite |
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| Affiliation: | 1. School of Chemistry and Chemical Engineering, Guangxi University for Nationalities, Nanning 530008, China;2. Guangxi Key Laboratory of Chemistry and Engineering of Forest Products, Nanning 530008, China;3. Key Laboratory of Chemical and Biological Transforming Process of Guangxi Higher Education Institutes, Nanning 530008, China;1. School of Chemical Engineering, The University of Queensland, St. Lucia, Brisbane, QLD 4072, Australia;2. School of Metallurgy and Chemical Engineering, Jiangxi University of Science and Technology, Ganzhou, Jiangxi 34100, China |
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| Abstract: | Gypsum supersaturated process water has been shown to have an adverse effect on the flotation of sphalerite minerals. This study probes the mechanism of such effect by determining the uptake of copper and xanthate on sphalerite in gypsum supersaturated water using zeta potential distribution measurement, atomic absorption spectroscopy, UV–visible spectroscopy and quartz crystal microbalance with dissipation. Our results indicate that the supersaturation of water by gypsum retards the adsorption of copper and hence the sequence xanthate adsorption on sphalerite. The retardation of copper and xanthate adsorption on sphalerite is also observed by the addition of 800 ppm calcium. The adsorption of calcium is identified to compete with copper species for the reactive surface sites of the sphalerite, resulting in the reduction in copper and xanthate uptake and hence flotation recovery of sphalerite. |
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| Keywords: | Gypsum supersaturated solution Sphalerite Xanthate Activation Copper ions Flotation |
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