Raymond roller mill is widely used in ultrafine grinding process of barite, calcite, potassium feldspar, limestone, talc, marble, dolomite and gypsum, etc. It also can do the super fine grinding process of non-flammable and non-explosive ore, chemical and construction materials with Mok's hardness under 9.3 and humidity below 6%. The particle size of the products can be regulated within 40-400. This series of Raymond mill can be divided into high-pressure micro powder grinding mill, strong pressure suspension grinder and general Raymond mill according to the fineness and productivity of finished products.