Abstract
In this study, open circuit single and two stage industrial scale vibrating ball mill (VBM) grinding
 performance of raw (uncrushed) cement clinker was investigated using different mill feed size
 distributions and grinding ball size configurations. The mill was modelled for the test cases using
 perfect mixing mathematical modelling approach. Different ball size configurations were applied
 in the grinding tests to estimate the effect of ball size configuration on grinding performance.
 Proposed coarse ball size configuration (30-20-15mm) was determined to increase the size
 reduction performance of single stage VBM grinding when coarse mill feed material was fed
 to the VBM (F50=185μm) as compared to the finer mill feed case (F50=24μm). VBM grinding
 performance was determined to increase with finer mill feed material (F50=24μm) and application
 of finer ball size configuration (10-8-6mm) in single stage grinding case as compared to the two
 stage grinding case.
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