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Refractory Technology

Refractory Technology
Bauxite calcining rotary kilns are lined with __________ bricks.

Carbon
Fireclay
Corundum
85% alumina

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

> 1730
> 2000
1630-1670
1520-1630

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Refractory Technology
Spalling tendency of refractories is reduced by increasing its

Thermal conductivity
Specific gravity
Strength
Porosity

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Refractory Technology
Refractoriness under load (RUL) is the most important property for the refractory bricks

At the hearth bottom of the furnace on which stock is placed
None of these
Used for furnace insulation
Used in the roof of the furnace

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Refractory Technology
The maximum linear expansion of silica bricks during firing is about __________ percent.

3.5
2
0.5
1

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Refractory Technology
Semi-silica bricks compared to silica bricks have

Better spalling resistance
Less fusion point
Neither A nor B
Both A & B

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