Discussion
An acidic refractory should not be used in contact with a
Answer: C
Correct answer: basic slag
An acidic refractory is silica-rich and a basic slag is lime-rich, so the two react and the lining is fluxed away. The rule is to match the lining to the process chemistry: acidic refractories with acidic slags, basic with basic, and neutral ones such as chromite and carbon where the environment is mixed or uncertain.
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