Raymond mill is widely used for grinding nonflammable and nonexplosive materials whose Moh's hardness is below and humidity less than 6% such as barite, calcite, potassium feldspar, talc, marble, limestone, dolomite, fluorite and lime, activated clay, activated carbon, bentonite, kaolin, cement, phosphate rock, gypsum, glass and thermal insulation materials in mine, metallurgy, chemistry and .