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Refractory Technology

Refractory Technology
With increase in the alumina content in firebricks, its fusion point (refractoriness)

Decreases
Remains unchanged
Increases
Decreases linearly

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Refractory Technology
Cold crushing strength of refractories depends upon its

Firing temperature
Composition
Texture
All of these

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Refractory Technology
Refractories subjected to alternate cycles of heating & cooling are liable to loose their resistance to

Thermal spalling
Slag attack
Fusion under load
CO attack

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Refractory Technology
Fusion temperature of pure silica (SiO₂) is __________ °C.

2800
1350
1715
2570

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Refractory Technology
Chrome magnesite brick is not used for lining the

Bottom hearth of reheating furnace
Coke oven regenerator
Burning zone of limestone rotary kilns
Hearth of soaking pits

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Refractory Technology
Magnesite refractories have low resistance to

Disintegration on sudden change of temperature
Both B and C
Abrasion
Attack by basic slag

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