A series of wet grinding experiments by a vertical type planetary ball mill with various composite grinding balls were carried out using calcite powder as the sample. From comparison of particle size distribution of the ground products using monosized grinding balls and composite grinding balls, it was found that the grinding rate for composite grinding balls of q=0.1 approx 0.3 was improved by 27 percent compared with that of the small monosized grinding balls of d_B=2.58 mm. The possibility of improvement was also confirmed from the experimental data using a high-G planetary ball mill of 150G.
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