... kinds of mine, chemical industry, building material, metallurgy. It can mill quartz, feldspar, calcite, talc, barite, fluorite, rare-earth, marble, ... for powder-processing. The rollers oscillate outward to press the ring because of the centrifugal force and the shovel scoops up ... the materials, send to the middle between the ring and rollers to accomplish the grinding.After grinding, the ...