R-Raymond mill for grinding barite, calcite, potash feldspar, talc, marble, limestone, gypsum, quartz stone, active white persons, activated carbon, bentonite, kaolinite, glass, manganese, chrome ore, slag, etc. Mohs hardness of not more than 7, and humidity below 6% of non-flammable mineral, chemical and building materials industries than 280 kinds of material for high fine powder generation and processing, product size 80-325 be adjusted within the project. Grade auxiliary extreme pressure devices and equipment, finished products up to 2500 mesh size.