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Refractory Technology

Refractory Technology
Hot blast main (carrying air at 1000°C) in blast furnace are lined with __________ bricks.

Silica
Magnesite
Zirconia
Fireclay

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Refractory Technology
Magnesite chrome bricks are used in the

All of these
Soaking pits
Reheating furnaces
Roof lining of basic open hearth & other basic furnaces

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

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

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Refractory Technology
With increase in the alumina content in firebricks, its fusion point (refractoriness)

Decreases
Decreases linearly
Remains unchanged
Increases

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Refractory Technology
Zirconia refractory

Has poor electrical conductivity at high temperature
Is produced from baddeleyite
Can not be used as an insulator
Does not react with basic slags

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Refractory Technology
Fusion point of a basic refractory material is

Reduced by the addition of acid oxides
Increased by the addition of acid oxides
Always less than 1000°C
Not affected by the addition of acid oxides

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