The effect of feed moisture on the comminution efficiency of HPGR circuits |
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| Affiliation: | 1. AGH University of Science and Technology, Faculty of Mining and Geoengineering, Department of Environmental Engineering and Mineral Processing, Poland;2. Norwegian University of Science and Technology, Department of Geology and Mineral Resources Engineering, Norway;1. Metso Process Technology and Innovation, PO Box 221, Kenmore, QLD 4069, Australia;2. CSIRO Mineral Resources Flagship, PO Box 883, Kenmore, QLD 4069, Australia;1. Department of Metallurgical and Materials Engineering, Universidade Federal do Rio de Janeiro – COPPE/UFRJ, Cx. Postal 68505, CEP 21941-972 Rio de Janeiro, RJ, Brazil;2. Vale S.A., Complexo de Tubarão, Vitória, ES, Brazil;3. Institut for Particle Technology, Technische Universität Braunschweig, Braunschweig, Germany;1. Department of Metallurgical and Materials Engineering, Universidade Federal do Rio de Janeiro – COPPE/UFRJ, Cx. Postal 68505, CEP 21941-972 Rio de Janeiro, RJ, Brazil;2. Vale S.A, Complexo de Tubarão, Vitória, ES, Brazil;1. School of Resources and Civil Engineering, Northeastern University, Shenyang 110819, China;2. College of Zijin Mining, Fuzhou University, Fuzhou 350116, China |
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| Abstract: | The comminution efficiency of high-pressure-grinding-rolls (HPGRs) is a well described function of a number of feed parameters including grindability, abrasion index, granulometric composition, top size and particle size distribution. Far less studied is the effect of feed moisture. This paper investigates both the overall and the specific comminution efficiency of a circuit consisting of a pilot HPGR unit followed by a batch ball mill as a function of the moisture level in the HPGR feed. Forsterite olivine sand (?7 mm) supplied by Sibelco Nordic was used as feed material. The results showed that the relationship between moisture and crushing efficiency for both the HPGR and the circuit can be described successfully by means of a parabolic function. Dry material, as well as that with the highest moisture content, showed the lowest particle size reduction ratios irrespective of the specific grinding force level. The paper also analyses the phenomenon of flake generation and shows that the feed moisture influences the flake content in the coarser size fractions of the HPGR product. |
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