Importance of oxidation during regrinding of rougher flotation concentrates with a high content of sulfides |
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| Affiliation: | 1. Julius Kruttschnitt Mineral Research Centre, The University of Queensland, Brisbane, Australia;2. Newcrest Mining Limited, 193 Great Eastern Highway, Belmont, Perth, Australia;3. School of Chemical Engineering, The University of Queensland, Brisbane, Australia;1. Department of Mineral Resources and Energy Engineering, Chonbuk National University, Jeonju, Jeonbuk 561-756, Republic of Korea;2. Department of Chemical and Biomolecular Engineering, KAIST, Daejeon 305-701, Republic of Korea;3. Geo-environment Division, JIU Corporation, B-816 Gangseo Hangang Xi Tower, 401 Yangcheon-ro, Gangseo-gu, Seoul 157-801, Republic of Korea;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;1. Department of Materials Science, University of Lubumbashi, P.O. Box 1825, Lubumbashi, Congo;2. Mineral Processing and Recycling Unit, GeMMe, University of Liege, B52/3, Sart Tilman 4000, Liege, Belgium;3. Department of Mines, University of Lubumbashi, P.O. Box 1825, Lubumbashi, Congo |
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| Abstract: | The objective of this study is to understand the flotation behavior of copper and gold minerals after regrinding the rougher flotation concentrate with a high pyrite content. It was found that low Eh and dissolved oxygen (DO) were produced after regrinding due to the quick consumption of oxygen by the large amount of fresh pyrite surfaces created, resulting in poor flotation of copper and gold and their selectivity against pyrite. A number of methods were used to provide an oxidizing condition, including pre-aeration before flotation, regrinding in an oxidizing condition, and addition of different oxidizing agents during regrinding. It was found that all the oxidizing methods improved the flotation of copper and gold, however, the effectiveness of these methods varied from case to case. This study demonstrates the importance of oxidation during or after regrinding for the flotation of rougher flotation concentrates with high sulfide contents. |
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| Keywords: | Regrinding chemistry Pyrite concentrates Copper–gold flotation Oxidizing condition |
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