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Refractory Technology

Refractory Technology
SiO₂ percentage in firebrick is about

80-85
>94
35-40
55-60

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Refractory Technology
Silliminite (Al2O₃.SiO₂) refractory, which is a neutral refractory, is not used in

Glass melting furnace
Gas retorts
Pottery furnace
Crucibles

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Refractory Technology
An ideal refractory should have high

Shrinkage ability
Fusion point
Spalling rate
None of these

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Refractory Technology
Colour of fireclay bricks is

Light buff to reddish buff
Black
None of these
Yellow

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Refractory Technology
Which property is important for bricks used in the combustion chamber & dome of blast furnace stoves?

High strength and density
High resistance to spalling
High refractoriness
All of these

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Refractory Technology
Zirconia refractory

Has poor electrical conductivity at high temperature
Is produced from baddeleyite
Can not be used as an insulator
Does not react with basic slags

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