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Post by kateula on Sept 4, 2007 8:13:06 GMT
What governs (math or physics) the motion of charge in a ball mill? I have interest in modelling and simulation of mineral processing systems.
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Post by scarcha on Sept 23, 2007 4:13:20 GMT
i think that the physics govern the motion on the charge...including the lifters geometry, the water percent, the break rate, the mass transport inside the mill... i think you can check the JK SimMet manuals... i think i see something about this in those manuals...
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Post by mpowell on Nov 1, 2007 0:41:00 GMT
There is quite a lot published on the motion of grinding media in mills. I published on the outer media motion, and then on experimental studies of the bulk motion, especially as influenced by liner design. M S Powell, The effect of liner design on the motion of the outer grinding media in a rotary mill. Int. J. Min. Process., Vol. 31. 1991. pp. 163-193 M S Powell, G N Nurick, “A Study of charge motion in Rotary Mills. Part 1 - Extension of the theory. Minerals Engineering, Vol. 9, No. 2 pp 259 - 268, 1996. Part 2 - Experimental 160Work. Minerals Engineering, Vol. 9, No. 3, pp 343 - 350, 1996. Part 3 - Analysis of Results. Minerals Engineering, Vol. 9, No. 4, pp 399 - 418, 1996.
Since the 90's the Discrete element method has taken over for modelling the full mill charge in 3D. Some references to this are:
Powell, M.S., McBride, A.T. (2006). What is required from DEM simulation to model breakage in mills? Minerals Engineering, Special issue – computation 05, Vol. 19, No. 10, pp. 1013-1021.
Cleary, P. W., 1998b. Predicting charge motion, power draw, segregation, wear and particle breakage in ball mills using discrete element methods, Minerals Engineering, 11, 1061-1080. Cleary, P., Morrison, R., Morrell, S., 2001. DEM validation for a scale model SAG mill. In proceedings International autogenous and semiautogenous grinding technology 2001, Sep. 30 - Oct. 3, Ed. Barratt et al, Published CIM, vol. IV, 191-206. Cleary, P., and Morrison, R.D., 2004. Using DEM to model ore breakage within a pilot scale SAG mill. Minerals Engineering, 17, 1117–1124.
Mishra, B.K., and Rajamani, R.K. (1994). Simulation of charge motion in ball mills: numerical Simulation. Int. J. Min. Proc., 40(4), 171-197. Mishra, B.K., 2003a. A review of computer simulation of tumbling mills by the discrete element method: Part I – contact mechanics. Int. J. Min. Proc., 71, 73-93. Mishra, B.K., 2003b. A review of computer simulation of tumbling mills by the discrete element method: Part II – Practical applications. Int. J. Min. Proc., 71, 95-112.
I have also published an article peeking at the potential future route of comminution modelling, based on an understanding of the motion f the charge in a mill. This is of course my view of the world, but does highlight the potential of, and current limitations to, this approach.
Powell, M.S., Morrison, R.D. (2007) The future of comminution modelling. International Journal of minerals processing. Vol. 84 pp. 228-239. Doi: 10.1016/j.minpro.2006.08.003
I hope that you find some of these references useful.
Malcolm Powell Chair in sustainable comminution JKMRC
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Post by kateula on Aug 26, 2008 14:53:49 GMT
Thanks for the responses
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Post by scarcha on Dec 16, 2008 13:42:42 GMT
recently at Procemin (Chile) congress Dr Jorge Menacho presents a work about the conminution using fenomenological models, including a transpor phenoma approach. those models are more sensitive to the circulating charge, predicting wich is the maximal CC in the conminution circuits.
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Post by azadeh on Dec 26, 2008 7:22:16 GMT
BMCS is another software for ball mill circuit simulation. it have been developed by Dr. Akbar Farzanegan. it also models the air separators.
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Post by azadeh on Dec 26, 2008 7:32:04 GMT
which models ae used for rod mill modelling?
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Post by phamluan on Feb 21, 2009 12:33:42 GMT
thank you very much
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Post by Deleted on Apr 21, 2013 9:00:19 GMT
In physics, symmetry includes all features of a physical system that exhibit the ... 5 Mathematics of physical symmetry ... Rotating the wire about its own axis does not change its position or charge density, hence it will preserve the field.
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