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Comparison of energy efficiency between ball mills and stirred mills in coarse grinding |
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| Authors: | Fengnian Shi Rob Morrison Andrew Cervellin Fraser Burns Fiesal Musa |
| Affiliation: | 1. The University of Queensland, Sustainable Minerals Institute, Julius Kruttschnitt Mineral Research Centre, Isles Road, Indooroopilly, Brisbane, Qld 4072, Australia;2. Cadia Valley Operations, Newcrest Mining, Australia;3. Energetics, Queensland, Australia;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. IsaMill? Technology Manager, Glencore Technology, Level 10, 160 Ann Street, Brisbane, Queensland 4000, Australia;2. Contract Metallurgist, Glencore Technology, Level 10, 160 Ann Street, Brisbane, Queensland 4000, Australia |
| Abstract: | Stirred mills are primarily used for fine and ultra-fine grinding. They dominate these grinding applications because greater stress intensity can be delivered in stirred mills and they can achieve better energy efficiency than ball mills in fine and ultra-fine grinding. Investigations were conducted on whether the greater performance of stirred mills over ball mills in fine grinding can be extended to coarse grinding applications. Four different laboratory ball mills and stirred mills have been tested to grind seven ore samples with feed sizes ranging from 3.35 mm to 150 μm. A case study on full scale operations of a 2.6 MW IsaMill replacing the existing 4 MW regrind ball mill at Kumtor Gold Mine in Kyrgyzstan is also included. This paper summarizes the major findings from these investigations. |
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