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Grinding aids matter more in finish milling than in raw milling because cement is

  • A.ground far finer, so agglomeration is much worse
  • B.ground much more coarsely than the raw meal ever is
  • C.always milled in a vertical roller mill of some kind
  • D.never permitted to contain any additive whatsoever

Answer: A

The finer the powder the stronger the tendency of particles to stick together and coat the media, so the penalty for not dispersing them grows with fineness. This is why almost every cement mill doses an aid while many raw mills do not.

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