269197 Numerical Parametric Investigation of Breakage in a Ball Mill

Tuesday, October 30, 2012
Hall B (Convention Center )
Matthew J. Metzger, Chemical and Biochemical Engineering, Rutgers University, Piscataway, NJ and Benjamin J. Glasser, Chemical and Biochemical Engineering, Rutgers, the State University of New Jersey, Piscataway, NJ

Size reduction is an essential operation across many industries.  Despite its prevalence, the efficiency of the conversion of applied force to the creation of new surfaces is extremely poor, none worse than the commonly encountered ball mill.  However, tuning of operational parameters may be a means to increase the low efficiency levels, if the proper connection between operating conditions and breakage conditions can be determined.  Described here is the implementation of the Bonded Particle Model (BPM) within the Discrete Element Method (DEM) framework to analyze the breakage of bonded agglomerates within a batch ball mill.  It is found that agglomerate strength and grinding media diameter affect breakage significantly; whereas grinding media fill level has a minor affect.  The majority of breakage occurs near the mill shell, rather than at the point of impact between the media and material and the extent of material breakage has a significant influence on the material flow within the mill.

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