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Refractory Technology

Refractory Technology
Chemically, mullite refractories is

Al2O₃
ThO₂
3Al2O₃.2SiO₂
ZrSO₄

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Refractory Technology
Upper portion of hot metal mixer are lined with mullite bricks, which helps in resisting the

Washing action of metal
Corrosion by layer of slag
Both A & B
Neither A nor B

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Refractory Technology
Which property of refractories is the most important for top section of the blast furnace?

Resistance to slag peneration
Resistance to abrasion
Resistance to corrosion by slag
Stability of volume at high temperature

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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
Refractoriness under loads (RUL) is quite close to the fusion temperature (PCE) for __________ bricks.

Fireclay
Very low alumina
Dolomite
Silica

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Refractory Technology
__________ of carbon blocks in the hearth of blast furnace helps in avoiding skull formation, when it becomes cold.

High density
Low porosity
Non-wetting characteristics
High thermal conductivity

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