Refractory Technology - Chemical Engineering Questions and Answers

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

silica

fireclay

magnesite

zirconia

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High alumina refractory compared to fireclay bricks have

less load bearing capacity.

less resistance to slag attack.

low refractoriness.

high resistance to thermal shock and creep.

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Refractory bricks with lower permeability is produced by using

higher firing temperature.

higher moulding pressure.

finer grog size.

all (a), (b) and (c).

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Refractory bricks having lower porosity have

high insulating properties

low heat capacity

low thermal conductivity

greater strength

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In panel test for spalling resistance, the average face temperature of panel assembly is maintained at __________ °C for 24 hours.

700

1000

1600

2000

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Which is not an acidic refractory ?

Silica

Fireclay

High alumina refractory

Carbon black

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Natural silica

mainly contains quartz.

is not stable at high temperature.

transforms to other allotropic forms i.e tridymite and cristoballite involving very high volume changes.

all (a), (b) and (c).

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Thermal conductivity of refractory bricks

increases with decrease in porosity.

decreases with decreases in porosity.

is independent of its porosity and is maximum for insulating bricks.

increases with the amount of air entrapped in pores.

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Dolomite bricks have good resistance to attack by

molten steel

iron oxide

lime slag

none of these