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Refractory Technology

Refractory Technology
Refractoriness/fusion points of 'superduty' refractories is __________ °C.

> 1730
1520-1630
1630-1670
> 2000

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Refractory Technology
Chromite refractories are

Basic refractory
Fired at a temperature of 600°C only
Acidic refractory
Neutral refractory

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Refractory Technology
Grog addition in fireclay during brick manufacture is done to

Enhance the strength of fired refractories
Reduce its shrinkage on heating
Impart greater spalling resistance
All of these

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Refractory Technology
High porosity refractory bricks have

Poor resistance to the peneration of molten slag, metal & flue gases
Better thermal spalling resistance
All of these
Poor heat conductivity & low strength

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Refractory Technology
Maximum safe working temperature for fireclay bricks is about __________ °C.

1450
1300
1550
1150

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Refractory Technology
Vacuum steel degassing units are lined with

High alumina bricks
Graphite blocks
Low duty firebricks
Silica bricks

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