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A vertical roller mill is preferred to a ball mill for raw grinding because it

  • A.produces a coarser product
  • B.requires no drying of the feed
  • C.occupies a smaller foundation area
  • D.consumes less electricity per tonne ground

Answer: D

Grinding by compression between rollers and a table is inherently more efficient than tumbling steel balls, and the mill dries the feed with kiln gas at the same time. Grinding is the largest electrical load in a cement works.

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