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INVESTIGATION OF LINER SHAPE EFFECTS ON LOAD MOVEMENT IN TUMBLING MILLS BY DISCRETE ELEMENT METHOD (DEM) - THE SARCHESHMEH COPPER COMPLEX AND GOL-E-GOHAR IRON ORE COMPANY SAG MILL CASES
By
Z. Bibak, E. Nematollahi and A. Ghasemi, M. Maleki Moghaddam, S. Banisi
Published in
International Mineral Processing Congress (IMPC)
at
2016
Direct link:
http://kmpchemmat.ir/pii/74854
Abstract
The major importance of liners in grinding is their role in providing an appropriate trajectory for the charge. Since it is not possible to study the charge movement by direct observation in operating industrial mills, this task is accomplished by physical (laboratory), and/or, mathematical (software) methods. Because of the high cost and a longer time required for a physical analysis, mathematical simulations have become more common. Simulation of the effect of liner shape on the charge movement has provided a means to select a proper design based on the operational objectives and conditions. Furthermore, the liner shape changes due to wear and impact during operation, which will influence the charge trajectory. This adds more of an incentive to use simulation. These changes in liner could be predicted through liner profile measurements during operation and/or simulation. In this research, an inhouse developed DEM software called KMPCDEM© was used to simulate the charge movement in industrial plant SAG mills. A geometrical method of implementing the shell liners on SAG mills at the Sarcheshmeh (9.75×4.87 m) and the Gole-E-Ghohar (9×2.05 m) operations facilitated the software simulation. Point by point implementation of the measurements of liner profiles of these mills enabled the study to trend the change in the charge movement as the liners wear. Comparison of the simulation to a laboratory mill (1 m diameter) showed that the difference between the measured and predicted charge impact point, shoulder angle and toe angle were 6, 4 and 3˚, respectively.
Keywords
Simulation, DEM, SAG Mills, Liner shape
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