The three-ring and medium-speed micronizer of HGM series is a kind of equipment of high efficiency and low cost for processing super fine powders, developed on the basis of twenty years?production experiences of mills, and examination of many kinds of grinders and pulverizers. Application It is a kind of equipment for processing fine and micro powders, and mainly used for non-inflammable and non-explosive fragile materials of middle or low hardness (its Mohs hardness is less than the sixth grade). These materials are as follows for reference: calcite, chalk, limestone, dolomite, kaolin and so on. When Mohs hardness of the material ranges from 4 to 6 grades, the service life of wearing parts will be shortened. Models: HGM60, HGM80, HGM100