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A primary crusher in a cement works typically reduces quarried stone to

  • A.pieces of roughly 25 to 80 millimetres
  • B.a fine powder finer than about 100 micrometres
  • C.blocks measuring roughly one metre across each
  • D.a pumpable slurry suitable for a wet-process kiln

Answer: A

This is coarse enough for the crusher to handle economically and fine enough for the raw mill to take. Reducing the stone all the way to meal in one machine would be far less efficient than splitting the duty between crusher and mill.

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