Discussion
Silica and fireclay are classed as
Answer: D
Correct answer: acidic refractories
Silica and fireclay are silica-rich and therefore acidic; they stand up to acidic slags and are attacked by basic ones. Magnesite, dolomite and lime are the basic refractories, and chromite, carbon and alumina are usually classed as neutral. The classification is chemical, not thermal, and it is what decides where a brick may be used.
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