... Easy Maintenance 5. ISO9002 / CE / CCC Brief introductionHGM Series Micro Powder Grinding mill is a kind of equipment which produces fine ... and superfine powder, it is suitable to process non-flammable and non-explosive ... than 6% and Mohs' hardness less than 9 such as calcite, chalk, limestone, dolomite, kaolin, bentonite, talcum, talc, magnetite, illite, ...