Raymond Mill . Raymond Mill Grinding Process A Raymond mill is widely applied to finely grind more than 280 non-flammable and explosive materials, whose Moh''s hardness is less than 9.3 and humidity is below 6%,such as barite, calcite, potassium feldspar, talc, marble, limestone, dolomite, fluorite, lime, activated clay, activated carbon, bentonite, kaolin, cement, phosphate ore, gypsum, glass ...