... mill is a kind of equipment which produces fine and superfine powder, it is suitable to process non-flammable and non-explosive ... 9 such as calcite, chalk, limestone, dolomite, kaolin, bentonite, talcum, talc, magnetite, illite, pyrophyllite, vermiculite, sepiolite, attapulgite, rectorite, diatomite, barite, gypsumalum ...