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In the rotary kiln, the calcination zone is where

  • A.the raw meal loses its moisture
  • B.the finished clinker is cooled by the incoming combustion air
  • C.limestone decomposes to lime and carbon dioxide
  • D.the clinker compounds finally form

Answer: C

Decomposition proceeds at around 900 degrees and consumes a large share of the kiln's heat, which is why a precalciner is fitted ahead of the kiln in modern plants. The clinkering reactions occur higher up the temperature scale.

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