Refractory Technology - Chemical Engineering Questions and Answers

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Refractoriness/fusion points of 'superduty' refractories is __________ °C.

1520-1630

1630-1670

> 1730

> 2000

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Outer combustion chamber of blast furnace stove is lined with __________ bricks.

fireclay

silica

chrome magnesite

zirconia

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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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Spalling of silica bricks occurs due to abrupt volume changes, when it is cooled below a temperature of __________ °C.

770

570

270

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Walls, roofs & combustion chambers of annealing furnaces are made of __________ bricks.

high duty fireclay

silica

mullite

carborundum

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Fireclay bricks are used in the

coke ovens regenerator.

outer lining of L.D. converter.

hearth bottom of blast furnace.

coke oven walls.

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Water content in ground refractory material to be shaped into bricks by hand moulding is about __________ percent.

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Chromite refractories

are bonded with lime and clay.

(free from silica) have better thermal fatigue resistance than silica and magnesite refractories.

are resistant to basic slag.

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

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Firing temperature is minimum (1250-1400 °C) for __________ bricks.

fireclay

direct bonded basic

silica

magnesite