... of non-flammable mine, chemical industry,and building material with moth's hardness less than 7 level an the moisture ... than 6%, such as barite, calcite, potash feldspar, pencil stone, marble, limestone, dolomite, fluorite, lime, active clay, active carbon, bentonite, ... grinding and packing is an independent production system.2. Compared with other milling plants, its passing ratio achieves 99%, this ...