Refractory Technology - Chemical Engineering Questions and Answers

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Tar bonded dolomite bricks

are stored under controlled temperature & humidity to avoid hydration.

are used in outer lining of L.D. converters.

have poorer hydration resistance than pitch bonded bricks.

all (a), (b) and (c)

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Electrical resistor bars are made of

silicon carbide

alumina

zirconia

graphite

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Which is not an alumino-silicate refractory?

Fireclay bricks.

Mullite bricks.

Tar dolomite bricks.

High alumina bricks.

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Periclase refractory contains mainly

CaO

MgO

Al₂O₃

SiO₂

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

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Silica bricks are attacked by basic slags at high temperature. Which of the following is not used solely as a binding material?

aluminium phosphate

water

lime

plaster of paris

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High thermal conductivity of a refractory material is not important, when it is to be used in the

coke oven regenarators

muffle furnace

blast furnace

recuperators

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Maximum safe working temperature for fireclay bricks is about __________ °C.

1150

1300

1450

1550

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Ferromagnetic ceramic material is not used in the

thermal insulation

transformers

magnetic switches

television sets