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A vertical roller mill grinds material by

  • A.high-pressure water jets striking against the particles
  • B.chemical attack that dissolves away the coarse fraction
  • C.compression under rollers running on a rotating table
  • D.impact from a tumbling charge of falling steel balls

Answer: C

Bed compression is a far more efficient way of breaking particles than impact, which is why these mills have largely displaced ball mills for raw grinding. They also dry the feed readily using hot gas drawn from the kiln.

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