... with Mohs’s hardness under six, such as calcite, chalk, limestone, dolomite, kaolin, bentonite, talc, mica, magnesite, illite, ... finish special size, the lifecycle of spare parts is about one year, which is 2-3times longer than impact ... dust pollution and noise.Model and technical data of Limestone Micro powder making machine:ModelHGM8021HGM9024HGM10027HGM10036Ring Diameter(mm)80090010001000Ring Number ...