Quartz is
A. Stable form of silica upto 870°C
B. Converted to tridymite on firing between 870 to 1470°C
C. Transformed to crystoballite on heating above 1470°C
D. All of the above
Answer: Option D
This Question Belongs to Chemical Engineering >> Refractory Technology
Related Questions on Refractory Technology
Fusion point of an acidic refractory material is
A. Increased by the addition of basic oxides
B. Reduced by the addition of basic oxides
C. Not affected by the addition of basic oxides
D. Not affected by the addition of basic oxides
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A. Kyanite
B. Sillimanite
C. Diaspore
D. Periclase
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A. Electric furnace walls
B. Steel melting furnace
C. Open hearth furnace
D. Burning zone of cement kilns
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