Discussion
Consider the following statements about refractory classification.
1. Silica brick is an acid refractory.
2. Magnesia brick is a basic refractory.
3. The terms refer to the pH of the material in water.
Answer: D
The first two are correct. The third misreads the terminology, which describes compatibility with furnace slags rather than any behaviour in aqueous solution. The two classes must also be kept apart within a single lining.
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