Raymond Mill|Grinder mill|Grinding plant|Milling equipment. Introduction. Raymond mill, also known as raymond grinding mill, raymond roller mill and raymond grinder, is suitable for grinding non-flammable and non-explosive materials whose Moh's hardness is below 9.3 and humidity less than 6% such as barite, calcite, potassium feldspar, talc, marble, limestone, dolomite, fluorite and lime ...