... reliable work,simple installation 4Simple operation 5charge-frequency control HM Series Roller MillCharacteristics: 1 Low investment, high efficiency, compared to the ... , graphite, limestone, calcite, marble stone, barite, Gypsum, pottery clay, chalk, dolomite,mica, illite, Leaf agalmatolite, vermiculite, sepiolite, concave-convex goodstone, rectorite ...