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Ring formation inside a kiln refers to

  • A.the circular pattern worn into the refractory
  • B.the shape of the flame at the burner tip
  • C.the arrangement of tyres supporting the shell
  • D.a build-up of material that restricts the bore

Answer: D

Correct answer: a build-up of material that restricts the bore

Rings are accretions of clinker or dust that build up on the lining at a particular point, narrowing the passage and disturbing both the gas flow and the movement of the charge. They can grow enough to block the kiln, and they are usually attacked with an air cannon or, if that fails, by stopping and cutting them out.

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