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Refractory Technology

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

Thoria
Fireclay
High alumina
Silicon carbide

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

80
60
95
45

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Refractory Technology
High porosity refractory bricks have

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

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Refractory Technology
Magnesite bricks have poor resistance to attack by __________ slag.

Basic
None of these
Acid
Lime

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Refractory Technology
Magnesite bricks are used in those parts of furnaces, which are

None of these
Required to resist corrosive basic slag
Subjected to high load
Subjected to temperature fluctuation

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Refractory Technology
Presence of MgO in alumino-silicate refractories __________ its refractoriness.

Increases
Lowers
Does not affect
Either A or B; depends on its quantity

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