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Refractory Technology

Refractory Technology
Chemically, mullite refractories is

3Al2O₃.2SiO₂
ThO₂
Al2O₃
ZrSO₄

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Refractory Technology
Because of its very high refractoriness of the order of __________ °C, silicon carbide refractories are used in zinc smelting furnace, muffle furnace and for supporting the wares in tunnel kilns.

2200
2400
2700
1800

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Refractory Technology
Vacuum steel degassing units are lined with

Graphite blocks
Low duty firebricks
Silica bricks
High alumina bricks

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Refractory Technology
Which is not a natural insulating material?

Asbestos
None of these
Vermiculite
Diatomaceous earth/kieselgur

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Refractory Technology
Colour of fireclay bricks is

None of these
Light buff to reddish buff
Yellow
Black

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Refractory Technology
Addition of zircon to silica refractory brick improves its

Neither A nor B
Neither A nor B
Crushing strength
Resistance to slag attack

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