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A rotary cement kiln is inclined and rotated so that

  • A.the charge travels slowly down the length as it turns
  • B.the flame can be directed upward and against gravity
  • C.the refractory lining can be replaced while it is running
  • D.the exhaust gases can leave at the same end as the feed

Answer: A

Correct answer: the charge travels slowly down the length as it turns

The slope gives the material a component of gravity along the axis and the rotation keeps lifting and dropping it, so the charge advances a little with every revolution while being continuously turned over. The residence time is set by the slope and the speed together, and both are adjusted to suit the burning.

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