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The grinding efficiency can be improved by use of a vertical roller mill, while reducing the energy consumption and improving the
product quality. The disclosed cement clinker grinding apparatus comprises a closed circuit for conveying the ground material from the
vertical roller mill (21) to the external separator (28) by the bucket elevator (29), for classifying the conveyed material into coarse
(Nikon Metrology: Brighton, MI) -- Nikon Metrology Inc.