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Tertiary air ducting carries hot air from the cooler to the

  • A.stack, to be discharged
  • B.precalciner, to burn fuel there
  • C.raw mill, to dry the feed
  • D.cement mill, to warm the clinker

Answer: B

Combustion in the calciner needs air, and taking it hot from the cooler rather than cold from outside saves a great deal of fuel. Secondary air, by contrast, enters the kiln itself through the hood. The two streams serve two burners in two different places.

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