Discussion
Assertion (A): The clinker cooler is regarded as part of the clinkering process rather than merely a handling stage.
Reason (R): The rate of cooling determines which phases survive and in what form.
Answer: D
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the reason gives the mechanism. Alite is unstable below about 1,250 degrees and decomposes to belite and free lime if cooled slowly, and the aluminate crystallises coarsely and reacts too fast if given time. Rapid cooling freezes the phases in their high-temperature form, so the cooler determines the product as much as the burning zone does.
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