Refractory Technology
Graphite or carbon refractories

Exhibit high shrinkage on thermal treatment
Exihibit wetting characteristics
Should be used in neutral or reducing atmosphere
Are not resistant to corrosion by slag

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Refractory Technology
Quartz is

Converted to tridymite on firing between 870 to 1470°C
All of these
Transformed to crystoballite on heating above 1470°C
Stable form of silica upto 870°C

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