Discussion
The burning zone of a rotary kiln operates at a material temperature of roughly
Answer: B
Correct answer: 1,450 degrees Celsius
The material reaches about 1,450 degrees in the burning zone, at which a portion of the charge melts and the liquid phase lets lime and silica combine into alite. The gas and flame are hotter still, around 2,000 degrees, which is what makes the refractory and cooling arrangements so demanding.
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