... / CCC Brief introductionHGM Series Micro Powder Grinding mill is a kind of equipment which produces fine and superfine powder, it is suitable to process ... ' hardness less than 9 such as calcite, chalk, limestone, dolomite, kaolin, bentonite, talcum, talc, magnetite, illite, pyrophyllite, vermiculite, sepiolite, attapulgite, rectorite ...