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The slurry, in its movement down the kiln, encounters a progressively higher temperature. At first, the water is driven off and __________ is liberated.

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The slurry, in its movement down the kiln, encounters a progressively higher temperature. At first, the water is driven off and __________ is liberated.

(a) SiO2

(b) CO2

(c) Gypsum

(d) CaO

The question was posed to me by my school principal while I was bunking the class.

My question is from Process of Manufacture of Fresh Concrete topic in division Fresh Concrete of Concrete Technology

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Right answer is (b) CO2

To elaborate: At 900°C limestone decomposes, CaCO3.CaO + CO2 (endothermic reaction) CO2 is swept away by current air.

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