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Abstract
Load movement in tumbling mills involving spherical particles has been extensively studied with the discrete element method (DEM) in the past. However, spherical particles can represent the behavior of real (irregular) shape particles only to a limited degree. Simulation of particles with realistic shape helps to capture the essential aspects of mechanical behavior of the particulate material. This strongly influences the charge trajectory and all related mechanisms (impact and abrasion). In this research, an in-house developed DEM software called KMPCDEM© was used to simulate the charge movement with spherical and real shape particles. Ten representative rock particles were selected and scanned using a 3D laser scanner. The outcome of this representation was a particle surface mesh which was imported into software for visual display. Each particle is represented with clusters of spheres (with identical size) by particle packing algorithm for contact detection and contact-force calculation. To validate the results, a model mill (100 cm diameter and 21 cm length) with one transparent end was used which made accurate photography possible. The experiments were performed at various fillings (25%) and mill speeds (85% of critical speed). Comparison of the simulation and experimental results showed that the difference between the measured and predicted charge impact points, shoulder angle and toe angle were 5, 4 and 8?, respectively. It was found that the shoulder angle increases for real shape particle because of interlocking of particles. The intensity of particle packing when using spherical and real shape particles was significantly different which was equally observed in image analysis and the simulation results. ER -

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		KMPC Hemmat A Mineral Processing Digital Library
	All Years to Access Full-Text Export citations AN INVESTIGATION OF PARTICLE SHAPE EFFECTS ON LOAD MOVEMENT IN TUMBLING MILLS BY DISCRETE ELEMENT METHOD (DEM) By Z. Bibak , S. Rahmani and S. Banisi Published in International Mineral Processing Congress (IMPC) at 2018 Direct link: http://kmpchemmat.ir/pii/243105 Abstract Load movement in tumbling mills involving spherical particles has been extensively studied with the discrete element method (DEM) in the past. However, spherical particles can represent the behavior of real (irregular) shape particles only to a limited degree. Simulation of particles with realistic shape helps to capture the essential aspects of mechanical behavior of the particulate material. This strongly influences the charge trajectory and all related mechanisms (impact and abrasion). In this research, an in-house developed DEM software called KMPCDEM© was used to simulate the charge movement with spherical and real shape particles. Ten representative rock particles were selected and scanned using a 3D laser scanner. The outcome of this representation was a particle surface mesh which was imported into software for visual display. Each particle is represented with clusters of spheres (with identical size) by particle packing algorithm for contact detection and contact-force calculation. To validate the results, a model mill (100 cm diameter and 21 cm length) with one transparent end was used which made accurate photography possible. The experiments were performed at various fillings (25%) and mill speeds (85% of critical speed). Comparison of the simulation and experimental results showed that the difference between the measured and predicted charge impact points, shoulder angle and toe angle were 5, 4 and 8?, respectively. It was found that the shoulder angle increases for real shape particle because of interlocking of particles. The intensity of particle packing when using spherical and real shape particles was significantly different which was equally observed in image analysis and the simulation results. ER - Keywords Simulation, DEM, SAG Mills, Particle shape, Interlocking