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Refractory Technology

Refractory Technology
__________ bricks are used in the burning zone of a cement rotary kiln.

High alumina
Silicon carbide
Fireclay
Thoria

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Refractory Technology
Chromite refractories are

Fired at a temperature of 600°C only
Basic refractory
Neutral refractory
Acidic refractory

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Refractory Technology
Magnesite refractories have low resistance to

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

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Refractory Technology
RUL of refractories depends on the

Chemical composition
All of these
Presence of impurities like iron & alkali
Physical structure

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Refractory Technology
Which of the following bricks should not be used, if the furnace is to be used intermit-tantly?

Silicon carbide bricks
Silica bricks
Firebricks
Sillimanite

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Refractory Technology
Hot face insulating linings of high purity alumina fused mullite are used, where

Very high temperatures are involved
All of these
Presence of iron or silica is harmful
Highly reducing conditions are involved

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