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If a precalciner completes 90 per cent of the calcination, what fraction remains for the rotary kiln to finish?

  • A.none at all
  • B.10 per cent
  • C.90 per cent
  • D.50 per cent

Answer: B

Correct answer: 10 per cent

\[ 100 - 90 = 10\ \mathrm{per\ cent}. \] Calcination is the most heat-hungry part of the process, so moving nine tenths of it out of the kiln and into the calciner is what allows a much shorter kiln to carry the same output - the kiln is left with the burning zone and little else.

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