... applicable to the grinding non-flammable and non-explosive materials with Moh’s hardness below 7 and moisture content below 6 ... %, such as barite, calcite, feldspar, talcum, pencil stone, marble, coke, powdered-coal, dolomite, fluorite, active carbon, betonies, ceramiciron ore ... Mill products. Professional 4R Raymond Mill for barite,glass,limestone,marble