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Refractory Technology

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

Burning
Preheating
All of these
Cooling

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Refractory Technology
Refractory bricks with lower permeability is produced by using

All of these
Higher moulding pressure
Higher firing temperature
Finer grog size

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Refractory Technology
Which is the stable form of silica between 1470°C and the melting point 1713°C ?

None of these
Tridymite
Cristobalite
Quartz

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Refractory Technology
Si percentage in silica refractories used in the walls of coke oven is about

95
60
45
80

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Refractory Technology
Silica refractories are not used in

Beehive coke ovens
Open hearth furnace roof
Coke oven walls
Dome and upper portion of B.F. stoves

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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
70
770
570

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