Sbm milling equipment is mainly used to produce fine powder and super fine powder.scm ultrafine mill is applicable to non-flammable and non-explosive materials with hardness less than 6mm, such as calcite, chalk, limestone, dolomite, kaolin, bentonite, talcum, talc, vermiculite, diatomite, barite, gypsum, alum earth, graphite, fluorite, and.