The effect of particle breakage mechanisms during regrinding on the subsequent cleaner flotation |
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| Affiliation: | 1. Julius Kruttschnitt Mineral Research Centre, The University of Queensland, Isles Road, Indooroopilly, Brisbane, QLD 4068, Australia;2. School of Chemical Engineering, The University of Queensland, St. Lucia, Brisbane, QLD 4072, Australia;1. The School of Mining Engineering, University of New South Wales, Sydney 2052, Australia;2. ARC Centre of Excellence for Functional Nanomaterials, School of Chemical Engineering, University of New South Wales, Sydney 2052, Australia;2. Facultad de Minas, Universidad Nacional de Colombia, Sede Medellín, AA 3840 Medellín, Colombia;3. Escuela de Física, Universidad Nacional de Colombia, AA 3840 Medellín, Colombia;4. Institución Universitaria Pascual Bravo, AA 6564 Medellín, Colombia;5. Facultad de Ingeniería, Universidad de Medellín, AA 1983 Medellín, Colombia;1. CSIRO Process Science and Engineering, Bayview Avenue, Clayton, VIC 3168, Australia;2. CSIRO Computational Informatics, Bayview Avenue, Clayton, VIC 3168, Australia;3. Ian Wark Research Institute, University of South Australia, Mawson Lakes, SA 5095, Australia;1. CSIRO Energy Technology, 1 Technology Court, Pullenvale, QLD 4069, Australia;2. CSIRO Earth Science and Resource Engineering, 1 Technology Court, Pullenvale, QLD 4069, Australia;1. Aminpro Perú S.A.C., Luis Carranza 1921, Lima, Peru;2. Aminpro Chile SpA, Cerro San Cristóbal 9511, Quilicura, Santiago, Chile;1. Julius Kruttschnitt Mineral Research Centre, University of Queensland, Isles Road, Indooroopilly, Brisbane, QLD 4068, Australia;2. Newcrest Mining Limited, 193 Great Eastern Highway, Belmont, WA 6104, Australia;3. School of Chemical Engineering, University of Queensland, St. Lucia, Brisbane, QLD 4072, Australia |
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| Abstract: | Stirred mills have been widely used for regrinding, and are acknowledged to be more energy efficient than tumbling mills. These two types of mills present different particle breakage mechanisms during grinding. In this study, the effect of regrinding by both mills on surface properties and subsequent mineral flotation was studied, using chalcocite as the mineral example. A rod mill and a stirred mill with the same stainless steel media were used to regrind rougher flotation concentrates. Different chalcocite flotation recovery was achieved in the cleaner stage after regrinding in tumbling and stirred mills. The factors contributing to the different recovery included particle size, the amount of created fresh surfaces, surface oxidation and the redistribution of collector carried from rougher flotation. All the factors were examined. It was determined that the predominating factor was the different distribution of collector resulting from different particle breakage mechanisms in the stirred and tumbling mills, in line with ToF-SIMS analysis. In the tumbling mill, the impact particle breakage mechanism predominates, causing the collector to remain on the surface of newly produced particles. In the stirred mill, the attrition breakage removes collector from the surface, and decreases particle floatability. Furthermore, the type of grinding media in the stirred mill also influences the subsequent flotation, again due to the change of particle breakage mechanisms. The results of this study demonstrate that the selection of regrinding mills and grinding media should not only depend on the required energy efficiency, but also on the properties of the surfaces produced for subsequent flotation. |
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| Keywords: | Regrinding Tumbling mill Stirred mill Particle breakage mechanism Flotation Chalcocite |
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