The sequence of zones in the rotary kiln are as____________________?
Correct answer: D. dry zone decomposition zone burning zone cooling zone
- A. dry zone burning zone decomposition zone cooling zone
- B. cooling zone burning zone decomposition zone dry zone
- C. burning zone cooling zone decomposition zone
- D. dry zone decomposition zone burning zone cooling zone
Explanation
In a rotary kiln, the material first loses moisture in the dry zone, then limestone decomposes in the decomposition zone, and finally the oxides combine in the burning zone before cooling. Therefore, the sequence is dry zone, decomposition zone, burning zone and cooling zone. Students may choose a by placing the burning zone before decomposition, although limestone must decompose first.
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