Refractory Technology - Chemical Engineering Questions and Answers

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10 to 30% magnesite is added to chromite to produce chrome-magnesite refractories. Magnesite addition is mainly done to improve the __________ of chromite.

spalling resistance

refractoriness

crushing strength

resistance to slag

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Silica bricks are never used for lining the

beehive coke ovens.

by-product coke ovens.

dome of blast furnace stoves.

roof of open hearth furnace.

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Which is not a natural insulating material?

Diatomaceous earth/kieselgur

Asbestos

Vermiculite

None of these

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Magnesite refractories are generally not used in the

electric furnace walls.

steel melting furnace.

open hearth furnace.

burning zone of cement kilns.

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Which is an acidic refractory ?

Magnesite

Dolomite

Fireclay

Chrome magnesite

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Carborundum used for making crucibles for melting non-ferrous metals is chemically

silicon carbide

silicon nitride

crystalline magnesia

zirconium sulphate

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

Al₂O₃

CaO

SiO₂

all (a), (b) & (c)

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Crushing strength of a refractory

increases with rise in service temperature.

decreases with rise in service temperature.

is unaffected with change in service temperature.

decreases with increase in porosity.

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Ramming masses are used for

obtaining monolithic working faces.

repairing construction of various furnace parts.

both (a) & (b).

neither (a) nor (b).