Discussion
Refractory lining in the burning zone is subjected to
Answer: A
Correct answer: high temperature, chemical attack and mechanical abrasion
All three act at once, which is what makes burning zone refractory so demanding. It sits at 1,450 degrees against material that includes a liquid phase attacking it chemically, and the charge grinds across it continuously as the kiln turns. Magnesia-spinel bricks are used because they resist the combination rather than any one of the three.
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