The important function of burning zone in the rotary kilm is __________________?
Correct answer: C. combination of different oxides like CaO SiO2 Fe2O3 and Al2O3
- A. to dry the moisture of slurry
- B. to decompose lime stone to unslaked lime
- C. combination of different oxides like CaO SiO2 Fe2O3 and Al2O3
- D. to reduce the impurities
Explanation
The burning zone reaches a high enough temperature for CaO, SiO2, Al2O3 and Fe2O3 to react and form the clinker compounds of cement. Drying occurs in the dry zone, while limestone decomposition occurs in the decomposition zone. Students may choose b because decomposition also requires heat, but the key function of the burning zone is combination of the oxides.
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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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