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Refractory Technology

Refractory Technology
Mullite is chemically represented by

2Al2O₃ . 3SiO₂
Al2O₃ . 2SiO₂
3Al2O₃ . 2SiO₂
Al2O₃ . SiO₂

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Refractory Technology
The maximum linear expansion of silica bricks during firing is about __________ percent.

0.5
2
3.5
1

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Refractory Technology
High porosity refractory bricks have

Poor resistance to the peneration of molten slag, metal & flue gases
All of these
Better thermal spalling resistance
Poor heat conductivity & low strength

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Refractory Technology
Highest melting (m.p = 3070°C) oxide refractory is

Zirconia
Magnesia
Alumina
Thoria

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Refractory Technology
Magnesite refractories are generally not used in the

Steel melting furnace
Open hearth furnace
Burning zone of cement kilns
Electric furnace walls

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Refractory Technology
__________ bricks are used in the burning zone of a cement rotary kiln.

Silicon carbide
High alumina
Fireclay
Thoria

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