A three-dimensional analysis of media motion and grinding regions in mills

Powell, M. S. and McBride, A. T. (2004) A three-dimensional analysis of media motion and grinding regions in mills. Minerals engineering, 17 11: 1099-1109. doi:10.1016/j.mineng.2004.06.022


Author Powell, M. S.
McBride, A. T.
Title A three-dimensional analysis of media motion and grinding regions in mills
Journal name Minerals engineering   Check publisher's open access policy
ISSN 0892-6875
Publication date 2004-06-09
Year available 2004
Sub-type Article (original research)
DOI 10.1016/j.mineng.2004.06.022
Volume 17
Issue 11
Start page 1099
End page 1109
Total pages 11
Place of publication Oxford
Publisher Pergamon Press
Collection year 2004
Language eng
Subject 091404 Mineral Processing/Beneficiation
Abstract Arising from the collection of numerical routines (validation toolbox) developed for validating discrete element method (DEM) predictions of charge motion in grinding mills, a range of rigorous charge analysis techniques have been developed. These provide descriptors of the motion and grinding regimes in a mill that hitherto have not been presented in the literature. To make the analysis meaningful, the descriptions of the charge motion were expressed as mathematical relationships that are applicable over the full range of charge motion that can be experienced in a rotary mill. The original division of the charge using the concept of the equilibrium surface, as proposed by Powell and Nurick (1996) [A study of charge motion in rotary mills. Part 1 – Extension of the theory. Miner. Eng. 9 (2), 259–268], has been refined to provide a surface that can be analytically derived from positional data. From this the position of the centre of circulation (CoC) of the charge can be objectively determined. The rate of circulation of the charge is calculated from knowledge of the position of the CoC. Improved techniques are presented for determining the shoulder and toe positions of the bulk charge. Plots of velocity, acceleration, interaction force, frequency of passing through a particular region, etc. can be expressed as a function of position in the mill. Through a consistent analytic characterisation of the charge, the influence of varying the operating conditions on the motion of the charge and the formation and intensity of different grinding regimes can be derived. This paper presents the methods to perform such an analytic characterisation and discusses how they may be used to improve milling efficiency.
Keyword Comminution
Grinding
SAG milling
Discrete Element Modelling
Simulation
References Cleary et al., 2003 P.W. Cleary, R. Morrison and S. Morrell, Comparison of DEM and experiment for a scale model SAG mill, Int. J. Miner. Process. 68 (2003), pp. 129–165. Article | PDF (1977 K) | View Record in Scopus | Cited By in Scopus (22) Davis, 1919 E.W. Davis, Fine crushing in ball mills, AIME Trans. 61 (1919), pp. 250–296. Fuerstenau et al., 1990 D.W. Fuerstenau, P.C. Kapur and B. Velamakanni, A multi-torque model for the effects of dispersants and slurry viscosity on ball milling, Int. J. Miner. Process. 28 (1990), pp. 81–89. Govender et al., 2001a I. Govender, V. Balden, M. Powell and G. Nurick, Validated DEM-Potential major improvements to SAG mill modelling In: Barratt et al., Editors, Proc. Int. Autogenous Semiautogenous Grind. Technol., vol. IV, CIM (2001), pp. 101–114. Govender et al., 2001b I. Govender, M.S. Powell and G.N. Nurick, 3D particle tracking: A rigorous technique for verifying DEM, Miner. Eng. 14 (2001) (10), pp. 1329–1340. Abstract | PDF (713 K) | View Record in Scopus | Cited By in Scopus (6) Liddell and Moys, 1988 K.S. Liddell and M.H. Moys, The effects of mill speed and filling on the behaviour of the load in a rotary grinding mill, J. S. Afr. Inst. Min. Metall. 88 (1988) (2), pp. 49–57. View Record in Scopus | Cited By in Scopus (15) Marechal, 1968 Marechal, B., 1968. Contribution a l’etude de la fragmentation quasi-autogene en voie seche (Contribution to a study of dry quasi-autogenous milling. Third part: Internal mechanics of the aerofall mill). Presented at the Faculty of Sciences, Nancy, 17th May. McBride et al., 2004 A. McBride, I. Govender, M.S. Powell and T. Cloete, Contributions to the experimental validation of the discrete element method applied to tumbling mills, Eng. Comput.: Int. J. Computer – Aided Eng. 21 (2004) (2), pp. 119–136. Full Text via CrossRef | View Record in Scopus | Cited By in Scopus (10) McIvor, 1983 R.E. McIvor, Effects of speed and liner configuration on ball mill performance, Mining Eng. (1983) (June), pp. 617–622. View Record in Scopus | Cited By in Scopus (20) Mishra et al., 1990 Mishra, B.K., Rajamani, R.K., Pariseau, W.G., 1990. Simulation of ball charge motion in ball mills. Soc. Min. Metall. Exploration, inc., Prep. 90-137, 1–5 March. Morrell, 1992 S. Morrell, Prediction of grinding-mill power, Trans. Inst. Min. Metall. (Sect. C: Mineral Process. Extr.) 101 (1992), pp. C25–C32. Powell and Nurick, 1996a M.S. Powell and G.N. Nurick, A study of charge motion in Rotary Mills. Part 1––Extension of the theory, Miner. Eng. 9 (1996) (2), pp. 259–268. Article | PDF (836 K) | View Record in Scopus | Cited By in Scopus (30) Powell and Nurick, 1996b M.S. Powell and G.N. Nurick, A study of charge motion in Rotary Mills. Part 2––Experimental work, Miner. Eng. 9 (1996) (3), pp. 343–350. Article | PDF (441 K) | View Record in Scopus | Cited By in Scopus (22) Rolf and Vongluekiet, 1984 L. Rolf and T. Vongluekiet, Measurement of energy distributions in ball mills, Ger. Chem. Eng. 7 (1984), pp. 287–292. View Record in Scopus | Cited By in Scopus (9) Symon, 1960 K.R. Symon, Mechanics (second ed.), Addison-Wesley Publ. Co. Inc., London (1960) p. 158. Vermeulen et al., 1984 L.A. Vermeulen, M.J. Ohlson de Fine and F. Schakowski, Physical information from the inside of a rotary mill, J. S. Afr. Inst. Min. Metall. 84 (1984) (8), pp. 247–253. View Record in Scopus | Cited By in Scopus (10) Vermeulen, 1985 L.A. Vermeulen, The lifting action of lifter bars in rotary mills, J. S. Afr. Inst. Min. Metall. 85 (1985) (2), pp. 51–63. White, 1905 H.A. White, The theory of the tube mill, J. Chem., Metall. Min. Soc. S. A (1905) (May), pp. 290–305. Yashima et al., 1988 S. Yashima, H. Hashimoto, Y. Kanda and S. Sano, Measurement of kinetic energy of grinding media in a tumbling ball mill In: E. Forssberg, Editors, Proc. XVI Int. Min. Process. Cong., Elsevier Science Publ., Amsterdam (1988), pp. 299–309.
Q-Index Code C1

Document type: Journal Article
Sub-type: Article (original research)
Collections: Julius Kruttschnitt Mineral Research Centre Publications
Excellence in Research Australia (ERA) - Collection
 
Versions
Version Filter Type
Citation counts: TR Web of Science Citation Count  Cited 9 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 16 times in Scopus Article | Citations
Google Scholar Search Google Scholar
Access Statistics: 202 Abstract Views  -  Detailed Statistics
Created: Tue, 27 Jan 2009, 11:41:04 EST by Marianne Steentsma on behalf of Julius Kruttschnitt Mineral Research Centre