... between rollers and ring, extend grinding time, and enhance crushing efficiency and fineness. 3. Use the high-efficiency and ... of mining, building materials, chemical industry, metallurgy, power plant, coal industry, etc., the machine is suitable for non ... calcium magnesium phosphate, coal, gangue, slag, zircon sand, talc, granite, potash feldspar, marble, barites, ceramics, glass and other grinding ...