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A precalciner is fitted between the preheater and the kiln in order to

  • A.complete most of the calcination before the kiln
  • B.cool the meal before it enters the burning zone
  • C.grind the meal to a finer size than the mill achieves
  • D.remove the alkalis from the material entirely

Answer: A

Burning part of the fuel in a separate vessel drives off most of the carbon dioxide before the material reaches the rotating shell. This allows a much shorter kiln for a given output and improves thermal efficiency considerably.

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