##### ball mill bulk volume

A ball mill is to produce a grind of 34 μm (P 80) product from a feed size of 200 μm at a rate of 15 t/h The grinding media used was 90% Al 2 O 3 ceramic ball of SG 35 The balls occupied 28% of the mill volume The mill was rotated at 65% of the critical speed The work index of the ore was 113 kWh/t Estimate the size of the mill