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Refractory Technology

Refractory Technology
Which is a neutral refractory?

Magnesia
Magnesite chrome
Graphite
Silica

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Refractory Technology
Rotary kilns meant for calcination of limestone are lined with chrome magnesite in __________ zone.

Burning
Preheating
Cooling
All of these

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Refractory Technology
Spalling of silica bricks occurs due to abrupt volume changes, when it is cooled below a temperature of __________ °C.

270
570
770
70

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Refractory Technology
Chrome magnesite bricks are

Having higher RUL than silica bricks
Neutral in nature
Acidic in nature
Made by mixing 30% chromite and 70% periclase

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Refractory Technology
Roof of a basic open hearth furnace is lined with __________ bricks.

Fireclay
Silica
Magnesite
Dolomite

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

Crystalline magnesia
Zirconium sulphate
Silicon carbide
Silicon nitride

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