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Refractory Technology

Refractory Technology
Carbon refractories have very high

Both B and C
Wetting characteristics
Thermal conductivity
Refractoriness

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Refractory Technology
Machine moulding of dry mixture of refractories requires a pressure of the order of __________ kg/cm².

10
1000
500
100

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Refractory Technology
Chemically, mullite refractories is

ZrSO₄
ThO₂
Al2O₃
3Al2O₃.2SiO₂

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Refractory Technology
Grog addition in fireclay during brick manufacture is done to

Reduce its shrinkage on heating
Impart greater spalling resistance
Enhance the strength of fired refractories
All of these

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Refractory Technology
Silica bricks have low spalling resistance below 600°C, due to its

Very high thermal conductivity
Low refractoriness
High thermal diffusivity
High co-efficient of expansion upto this temperature

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Refractory Technology
Bauxite calcining rotary kilns are lined with __________ bricks.

Carbon
Fireclay
Corundum
85% alumina

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