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Alternative fuels used in cement kilns include

  • A.ground limestone recycled back from the quarry face
  • B.waste tyres, solvents and processed municipal waste
  • C.fresh water sprayed directly into the burning zone
  • D.compressed air taken from the general plant supply

Answer: B

Correct answer: waste tyres, solvents and processed municipal waste

A cement kiln burns these well because the gas residence time is long, the temperature is very high, and the alkaline charge neutralises acid gases. The ash is incorporated into the clinker rather than left over, which is why the kiln is used for wastes that would otherwise need dedicated incineration.

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