Discussion
The clinkering or burning zone of a cement kiln reaches about
Answer: D
Correct answer: 1450 degrees Celsius
The burning zone reaches about 1450 °C, which is the temperature at which part of the charge melts and the liquid phase allows lime and silica to combine into tricalcium silicate. Calcination of the limestone is complete well below this, at around 900 °C; the extra heat is needed for the clinkering reactions themselves rather than for driving off carbon dioxide.
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