Sillimanite (Al2O3.SiO2) refractory, which is a neutral refractory, is not used in________________?
Correct answer: D. Gas retorts
- A. Pottery furnace
- B. Glass melting furnace
- C. Crucibles
- D. Gas retorts
Explanation
Sillimanite refractories are used in applications such as pottery and glass furnaces and in crucibles, but gas retorts generally use other refractory materials. Hence gas retorts are the unsuitable application listed.
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