Discussion
Consider the following statements about clinker burning.
1. Belite forms before alite in the reaction sequence.
2. Alite forms by belite taking up further lime in the melt.
3. Alite forms directly from limestone without any intermediate.
Answer: C
Correct answer: 1 and 2 only
Statements 1 and 2 describe the sequence correctly: belite forms first by solid-state reaction, and alite forms later when belite takes up further lime in the presence of the melt. Statement 3 skips the intermediate, which is not how the reaction proceeds - and it is precisely because alite forms from belite that a shortage of lime leaves belite unconverted.
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