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Refractory Technology

Refractory Technology
Vacuum steel degassing units are lined with

Silica bricks
High alumina bricks
Graphite blocks
Low duty firebricks

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Refractory Technology
Cold crushing strength of a refractory does not depend upon its

Shape
Firing temperature
Composition
Texture

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Refractory Technology
With increasing alumina content, the fusion point of high alumina refractories

Increases
Decreases
Remains constant
May increase or decrease ; depends on its alumina content

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Refractory Technology
10 to 30% magnesite is added to chromite to produce chrome-magnesite refractories. Magnesite addition is mainly done to improve the __________ of chromite.

Resistance to slag
Refractoriness
Crushing strength
Spalling resistance

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

100
1000
500
10

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Refractory Technology
Colour of fireclay bricks is

Black
None of these
Light buff to reddish buff
Yellow

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