To assess the effects of mill operating parameters such as speed, ball filling, slurry concentration and filling on grinding process size distribution product, it was endeavored to build a pilot model with smaller than mill. For this aim, 1 m × 0.5 implemented. There are 15 lifters 50 mm height face angle 30˚. In present work, combination balls (40% 60 diameter, 40% 40 diameter 20% 25 diameter)...