The effect of ball size on breakage rate parameter in a pilot scale ball mill |
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| Authors: | A Seyfi Erdem ? Levent Ergün |
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| Affiliation: | 1. Mu?la S?tk? Koçman University, Faculty of Engineering, Dept. of Mining Engineering, Kötekli, Mu?la 48000, Turkey;2. Hacettepe University, Faculty of Engineering, Dept. of Mining Engineering, Beytepe, Ankara 06800, Turkey;1. Civil and Resource Engineering School, University of Science and Technology Beijing, Beijing 100083, People’s Republic of China;2. State Key Laboratory of Process Automation in Mining & Metallurgy, People’s Republic of China;3. School of Chemical and Process Engineering, University of Leeds, LS2 9JT, UK;1. Department of Mining Engineering, National Institute of Technology Karnataka, Surathkal, Mangalore 575025, India;2. R & D and SS, JSW Steel Limited, Vijayanagar Works, P.O. Vidyanagar, Ballari, Karnataka 583275, India;1. Materials and Process Synthesis (MaPS), a Research Centre of the University of South Africa (UNISA), Florida Campus, Private Bag X6, Johannesburg 1710, South Africa;2. Department of Electrical and Mining Engineering, University of South Africa (UNISA), Florida Campus, Private Bag X6, Johannesburg 1710, South Africa;3. School of Chemical and Metallurgical Engineering, University of the Witwatersrand, Private Bag X3, Wits 2050, Johannesburg, South Africa |
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| Abstract: | The objective of this study is to investigate the effect of ball size on grinding kinetics in a pilot scale ball mill. Six different ball media gradings were tested. Comparative tests were conducted in batch ball mill having 1.2 m diameter and 0.6 m length at constant operating condition of mill such as media mass, mill speed and input specific energy. Feed samples were ground batchwise and representative sample was taken from inside the mill for each determined grinding period. Grinding process in ball mill was modeled and the specific rate of breakage was calculated for the each test. The results indicated that the relationship between different breakage rate and particle size has a maximum for each ball size distribution. Consequently, a new equation to correlate maximum ball size and particle size at maximum breakage occurs is proposed. |
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