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Raymond Mill. Raymond mill (Raymond roller mill) is applicable to the grinding and processing of more than 280 kinds of nonflammable and nonexplosive materials whose hardness less than 7 and humidity is less than 6% in mining, construction, chemical industry and metallurgy, such as barite, calcite, potash feldspar, talc, marble, limestone, dolomite, fluorite, lime, activated clay, activated ...