Ore ultrafine mill is the continuation of broken process; its purpose is to make the ore with a variety of useful mineral grains that are closely integrated and symbiotic reach monomer separation. And make its viscosity meet the requirement of sorting operation. The position of ultrafine mill operation in dressing plant is very important, because the effect of ultrafine mill directly affect the concentrate grade and metal recovery. If the particle size of ultrafine mill mineral is too large, useful mineral particle can't all or most achieve monomer dissociation which will affects the concentrate grade and metal recovery. However, it would generate a lot of fine mud if grind excessively, which will not only deteriorates the sorting process, but also affects the normal conduct of the concentrate dewatering operations. Therefore, the ultrafine mill operation must provide the most suitable product size for sorting operation. The Raymond is commonly used equipment in ultrafine mill operation, which plays a prominent role in the mineral processing industry.