REFRACTORY TECHNOLOGY QUIZ

Silica bricks are attacked by basic slags at high temperature. Which of the following is not used solely as a binding material?

Plaster of paris

Aluminium phosphate

Lime

Water

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YOUR ANSWER : ?

Magnesite refractories are used for the construction of those furnaces, which are

Both (b) and ©

Used for raising & maintaining high temperature

Not required to resist the corrosive action of basic slag

Not subjected to fluctuation in temperature

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Which is the stable form of silica upto 1470°C ?

Cristobalite

Quartz

Tridymite

None of these

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Insulating refractories should have

Both A & B

High porosity

Low thermal conductivity

Neither A nor B

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Maximum apparent porosity of magnesite bricks is about __________ percent.

44

8

58

24

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__________ of carbon blocks in the hearth of blast furnace helps in avoiding skull formation, when it becomes cold.

Non-wetting characteristics

High thermal conductivity

Low porosity

High density

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Quartz is

Converted to tridymite on firing between 870 to 1470°C

All of these

Stable form of silica upto 870°C

Transformed to crystoballite on heating above 1470°C

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Bauxite calcining rotary kilns are lined with __________ bricks.

Corundum

85% alumina

Fireclay

Carbon

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The largest consumer of refractories is the __________ industry.

Metallurgical

Fertiliser

Cement

Power

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An indication of degree of firing in silica brick is its

Specific gravity

RUL

Fusion point

None of these

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