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Refractory Technology

Refractory Technology
Magnesite bricks have poor resistance to attack by __________ slag.

None of these
Basic
Acid
Lime

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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.

Crushing strength
Refractoriness
Resistance to slag
Spalling resistance

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Refractory Technology
Which of the following impurities reduces the refractoriness of magnesite bricks?

CaO
All of these
SiO₂
Al2O₃

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Refractory Technology
Hot metal runner in blast furnace are lined with __________ bricks.

Magnesite
Silica
Carborundum
Fireclay

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Refractory Technology
Fusion temperature of pure silica (SiO₂) is __________ °C.

2570
1350
2800
1715

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Refractory Technology
Capacity of a refractory brick to withstand-sudden changes in temperature is denoted by the property called

Refractoriness under load (RUL)
Refractoriness
Spalling resistance
None of these

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