... feldspar, calcite, talc, barite, fluorite, rare-earth, marble, ceramic, bauxite, manganese ore, iron mine, copper, phosphate ore, etc, ... processing. The rollers oscillate outward to press the ring because of the centrifugal force and the shovel ... the materials, send to the middle between the ring and rollers to accomplish the grinding.After grinding, ... -2.5 Raymond Mill for ore dressing , metallurgy