Discussion
The reaction sequence in a cement kiln proceeds in the order
Answer: C
Correct answer: drying, calcination, solid-state reaction, clinkering
The sequence follows the rising temperature along the kiln: water is driven off first, then the carbonate decomposes from about 800 degrees, then lime and silica begin to combine in the solid state to form belite, and finally at about 1,450 degrees a liquid phase appears and alite forms in it.
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