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Refractory Technology

Refractory Technology
Grog

Iscrushed firebrick
All of these
Contains both alumina and silica
Is a non-plastic material

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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
Pure bauxite is the best raw material for the manufacture of high alumina refractories, in which maximum alumina content can be as high as __________ percent.

55
70
90
80

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Refractory Technology
Fireclay bricks are not used in the

Coke oven regenerators
By-product coke oven walls
Beehive coke oven
Combustion chamber of B.F. stoves

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Refractory Technology
With increase in the alumina content, the refractoriness of high alumina refractories

Increases
May increase or decrease
Remains same
Decreases

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Refractory Technology
To resist spalling tendency, a refractory should have

Low thermal co-efficient of expansion
Greater diffusivity
Low specific heat
All of these

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