Which of the following is not a high alumina refractory material ?
Correct answer: D. Periclase
- A. Kyanite
- B. Sillimanite
- C. Diaspore
- D. Periclase
Explanation
Periclase is essentially magnesium oxide, MgO, and is therefore a basic magnesia refractory rather than a high-alumina material. Kyanite, sillimanite and diaspore are alumina-bearing raw materials used for high-alumina refractories.
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