The effect of using different comminution procedures on the flotation of sphalerite |
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| Authors: | N.A. Palm N.J. Shackleton V. Malysiak C.T. O’Connor |
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| Affiliation: | 1. Anglo Research, P.O. Box 106, Crown Mines 2025, South Africa;2. Centre for Minerals Research, Department of Chemical Engineering, University of Cape Town, Rondebosch 7700, South Africa;1. JKMRC, Australia;2. University of Cape Town, South Africa;1. Surface Science Western, University of Western Ontario, 999 Collip Circle, London, ON N6G 0J3, Canada;2. Mining and Minerals Division, Saskatchewan Research Council, 125-15 Innovation BLVD, Saskatoon, SK S7N 2X8, Canada;1. Faculty of Land Resource Engineering, Kunming University of Science and Technology, Kunming 650093, China;2. State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization, Kunming University of Science and Technology, Kunming 650093, China;1. Mineral Processing Group, Division of Sustainable Process Engineering, Department of Civil, Environmental and Natural Resources Engineering, Luleå University of Technology, SE-971 87 Luleå, Sweden;2. Chemistry of Interfaces Group, Division of Sustainable Process Engineering, Department of Civil, Environmental and Natural Resources Engineering, Luleå University of Technology, SE-971 87 Luleå, Sweden |
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| Abstract: | High Pressure Grinding Rollers (HPGR) are known to reduce energy consumption and wear costs and improve the throughput in the circuit. It has been suggested that they can also modify the liberation characteristics of the ore. In the present study the effect of using conventional crushing as opposed to HPGR in combination with either dry or wet milling was investigated using a base metal sulphide, viz. sphalerite, in order to determine whether there may be an improvement in flotation performance following the use of different comminution procedures. It was found that, irrespective of the crushing procedure (HPGR or conventional), dry milling resulted in the highest grades and recoveries of zinc. These were typically 94% recovery at 40% grade. In order to gain an insight into the effect which these comminution procedures had on the ore, samples of feed and product were investigated using surface analytical techniques. Mineralogical analyses showed no differences in the liberation characteristics of sphalerite irrespective of the comminution procedures used. However, dry milling produced a lower d50. The paper proposes possible reasons to explain these observations. |
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