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The residence time of material in a modern precalciner kiln is roughly

  • A.about eight hours
  • B.half an hour
  • C.several days
  • D.a few seconds

Answer: B

The shell is short and the material moves through it fairly quickly once calcination has been done in the tower. Gas passes through the whole system in a matter of seconds. The contrast between the two residence times is very large indeed.

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