The effect of zinc cyanide on the flotation of gold from pyritic ore |
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| Affiliation: | 1. School of Chemical Engineering, The University of Queensland, St. Lucia, Brisbane, QLD 4072, Australia;2. Guangdong Petroleum Chemical Engineering Research Institute, Guangzhou, Guangdong 510665, China;1. Department of Mining and Geological Engineering, University of Arizona, Tucson, AZ 85721, United States;2. Department of Advanced Materials Science and Engineering, Daejin University, Pocheon 487-711, South Korea;1. Department of Mining and Materials Engineering, McGill University, 3610 University, Montreal, QC H3A 0C5, Canada;2. Centro de Investigación y de Estudios Avanzados del IPN Unidad Saltillo, A.P. 663, 25900 Coah., Mexico;1. School of Chemical Engineering, The University of Queensland, St. Lucia, Brisbane, QLD 4072, Australia;2. Pionera, P. O. Box 162, NO-1701 Sarpsborg, Norway;3. Department of Chemical and Materials Engineering, University of Alberta, Edmonton, AB T6G 1H9, Canada;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: | In gold processing plants, the process water contains a considerable amount of weak acid dissociable (WAD) cyanide species. The cyanide-containing water recycled to flotation circuits has a deleterious effect on mineral flotation. Zinc cyanide can be a major constituent of the process water due to the cyanide leaching of zinc minerals and the zinc cementation applied to precipitate gold and silver. In the present study, the effect of zinc cyanide on the flotation of gold from a pyritic ore was evaluated and the competitive adsorption between zinc cyanide species and the collector, potassium amyl xanthate (PAX) or Aerophine promoter (3418A), on gold was studied by surface enhanced Raman spectroscopy (SERS). It was found that free cyanide did not depress the flotation of liberated gold, but zinc cyanide with a CN/Zn ratio of 2 did. The depression of gold flotation by zinc cyanide was due to the preferential adsorption of Zn(CN)2 on gold surface over either 3418A or amyl xanthate in the solution, rendering gold surface hydrophilic. |
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| Keywords: | Zinc cyanide Gold Flotation Collector Raman spectroscopy |
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