Effects of mill feed size and rod charges on grinding performance

Abstract The effects of mill feed sizes and the rod charges on ground product fineness, energy utilization and energy consumption have been investigated on a rod mill under dry batchwise grinding conditions. The effect of reducing mill feed size on product fineness decreases with grinding time, while the effects of different composition of rod charges are very small. Smaller rod diameter, coarser mill feed size and shorter grinding time will increase the energy utilization. The energy consumption in batch grinding is described by the Bond method. Using smaller rod diameter and reducing the mill feed size will optimize energy use in coarse grinding.