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