Sillimanite is a _____________ refractory?
Correct answer: C. High alumina
- A. Basic
- B. Neutral
- C. High alumina
- D. Insulating
Explanation
Sillimanite, Al₂SiO₅, contains a high proportion of alumina and is therefore classified as a high-alumina refractory. It is also chemically neutral, but high alumina is the more specific classification among the choices.
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