... materials, gypsum, barite, phosphate rock, decomposition of stone, kaolin materials with medium hardness. HRM ... materials, gypsum, barite, phosphate rock, decomposition of stone, kaolin materials with medium hardness. HRM ... out roller, advantages of convenient repair. Main specification & technical parameters Parameter /SpecificationHRM1300MHRM1400MHRM1500MHRM1700MHRM1900MDia. of mill discmmΦ1300Φ ...