The Effect of Rod Cross-Sectional Shape on Grinding Kinetics in Laboratory Dry Rod Mill

The effects of grinding media shape and charge filling on grinding kinetics were investigated in dry rod milling. Two shapes of grinding media (simple and grooved rods) were assessed.The results showed that the production rate of particles smaller than 90 microns and the disappearance rate of particles larger than 2 mm for simple rods were higher than the grooved rods. Also with decreasing the mill filling from 100 to 80% for grooved rods, the grinding kinetics rate was increased. The results showed that the grinding media shape did not change the grinding mechanism in rod mill. However, the operational advantage of using grooved media was in the production of less fine particles compared to the simple grinding media.