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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About Exothermic and Endothermic Reactions
Exothermic reactions release heat to the surroundings and have negative enthalpy change, while endothermic reactions absorb heat and have positive enthalpy change. The topic uses energy profiles to identify reactants, products and activation energy, and includes bond energy, enthalpy diagrams, calorimetry and Hess's law for calculating overall heat changes.
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