Advanced comminution modelling: Part 2 - Mills |
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| Institution: | 1. Computational Mechanics and Scientific Computing Group, Technical University of Cartagena, Campus Muralla del Mar, Cartagena 30202, Murcia, Spain;2. INEI, Universidad de Castilla-La Mancha, 13071 Ciudad Real, Spain;1. School of Mechanical and Transportation Engineering, Guangxi University of Science and Technology, Liuzhou 545006, China;2. School of Sciences, Nanjing University of Science and Technology, Nanjing 210094, China;1. Center of Materials Science and Optoelectronics Engineering, College of Materials Science and Opto-Electronic Technology, University of Chinese Academy of Sciences, Beijing 100049, China;2. Qiushi Honors College, Tianjin University, Tian jin 300350, China;3. McGill Metals Processing Centre, McGill University, Montreal, Quebec H3A 2B2 Canada;1. School of Sciences, Chang''an University, 710064 Xi''an, PR China;2. School of Aeronautics, Northwestern Polytechnical University, 710072 Xi''an, PR China;3. School of Mathematics, Yunnan Normal University, 650500 Kunming, PR China;4. School of Mathematics and Statistics, Xi''an Jiaotong University, 710049 Xi''an, PR China |
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| Abstract: | This second part paper explores rock breakage mechanisms, the life cycle of rocks in mills and the strong influence of end walls on charge motion within mills. We present recent advances in particle-based modelling of mills for comminution focused around wear and the effect of slurry and slurry phase grinding. Three mill scenarios are considered:- 1.Media flow and the resulting wear evolution of the belly and end wall liners and the resulting change in mill performance for a full industrial scale dry ball mill (modelled using DEM)
- 2.Axial slurry transport and mixing in a wet overflow industrial scale ball mill (modelled using fully coupled DEM and SPH)
- 3.Effect of mill speed on slurry and solid charge motion and the resulting grinding of fine particles in a 1.8 m diameter wet Hardinge pilot mill (modelled using fully coupled DEM and SPH with advection-diffusion-population balance equations solved for the slurry size distribution for each SPH particle)
These demonstrate the nature and level of fidelity that is now possible to include in particle-scale comminution models. They provide insights into the critical importance of curtain flows generated by the end walls of tumbling mills, on wear behaviour on liners, on the structure of slurry pools and mill discharge and on the adverse effect on grinding of increasing mill speed. |
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