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State whether the following is true or false.
Alternative raw materials can be used without checking their composition, since the kiln destroys impurities.

  • A.True
  • B.False
  • C.True only at large scales
  • D.False only at small scales

Answer: B

The kiln destroys organic matter but not the elements themselves, and chlorides, alkalis and heavy metals all pass through into the clinker or the gas stream. Incoming waste materials are analysed at least as carefully as quarried ones.

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