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Refractory Technology

Refractory Technology
Periclase refractory contains mainly

MgO
CaO
SiO₂
Al2O₃

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

Cooling
All of these
Preheating
Burning

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Refractory Technology
Spalling resistance of a refractory can not be increased by

Making it denser
Decreasing its thermal co-efficient of expansion
Increasing its porosity
Using a coarser grog during its manufacture

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Refractory Technology
Rate of slag attack on refractories increases with rise in temperature due to the

None of these
Increased thermal conductivity of brick
Oxidising condition in the furnace
Decreased viscosity of slag

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Refractory Technology
Fusion point of a basic refractory material is

Always less than 1000°C
Increased by the addition of acid oxides
Not affected by the addition of acid oxides
Reduced by the addition of acid oxides

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Refractory Technology
Pure bauxite is the best raw material for the manufacture of high alumina refractories, in which maximum alumina content can be as high as __________ percent.

90
80
55
70

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