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Refractory Technology

Refractory Technology
Which one contains minimum percentage of SiO₂?

Aluminous firebrick
Firebrick
Semi-silica
Sillimanite

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Refractory Technology
Maximum safe working temperature for fireclay bricks is about __________ °C.

1450
1300
1150
1550

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Refractory Technology
Magnesite refractories are generally not used in the

Steel melting furnace
Electric furnace walls
Burning zone of cement kilns
Open hearth furnace

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

Decreases
Remains unchanged
Decreases linearly
Increases

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Refractory Technology
Magnesite refractories have low resistance to

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

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Refractory Technology
Refractory castables are used for

Producing monolithic linings
All of these
Patch work
Minimising the number of joints in the structure

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