Characterisation of coarse composite sphalerite particles with respect to flotation |
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| Affiliation: | 1. Ian Wark Research Institute, University of South Australia, Mawson Lakes, SA 5095, Australia;2. South Australia Museum North Terrace, Adelaide, SA, Australia;1. Jiangxi Key Laboratory of Mining Engineering, Jiangxi University of Science and Technology, Jiangxi 341000, China;2. Faculty of Resource and Environmental Engineering, Jiangxi University of Science and Technology, Jiangxi 341000, China;1. Mineral Processing Dept., Tarbiat Modares University, Tehran, Iran;2. Oil and Gas Engineering Dept., University of Tehran, Tehran, Iran;1. JKMRC, The University of Queensland, 40 Isles Road, Indooroopilly, QLD 4068, Australia;2. Anglo Technical Solutions Research, PO Box 106, Crown Mines 2025, South Africa;3. Anglo American Platinum, 55 Marshall Street, Marshalltown, Johannesburg 2001, South Africa;1. Faculty of Land Resources Engineering, Kunming University of Science and Technology, Kunming 650093, Yunnan, China;2. State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization, Kunming University of Science and Technology, Kunming 650093, Yunnan, China |
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| Abstract: | The flotation response of a typical zinc-lead (Zn/Pb) ore, with respect to coarse composite (sulphide/non-sulphide) particles is reported. The flotation tests were carried out on a selected feed particle size range (?600 + 75 μm, at P80 of 390 μm) and the recovery of Zn composite particles analysed on a size by size basis. The best results were achieved with the use of 75 g/t sodium isopropyl xanthate (SIPX), obtaining a Zn recovery of 77%, with a significant improvement at the coarse end of the particle size distribution. Computerised scanning electron microscope (QEMSCAN) was used to characterise value mineral grain size and degree of liberation, as well as gangue and sphalerite association in particles reporting to both concentrate and tailings. A new characterisation function (Locking ratio, LR) was developed based on the data from the automated mineralogical analysis to characterise particles into two-phase composites with different degree of locking texture (simple and complex). The function, which is based on the mode of occurrence of sphalerite, grain size, proportion and composition of the constituent minerals in each particle, was used to study the flotation response of the particles with different degrees of locking. The results highlight the difference in recoverability of the sphalerite bearing particles with different degrees of locking, with simple locking texture giving higher recovery than complex locking texture, for the same overall liberation. |
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| Keywords: | Composite particles Flotation Sphalerite Simple locking texture Complex locking texture |
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