Chemical Engineering - Refractory Technology

21. 

Carbon bricks are not used in the lining of the

A. combustion chamber of blast furnace stoves.
B. electric furnaces.
C. highly chemical resistant equipments.
D. blast furnace hearth.

Answer: Option A

Explanation:

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22. 

Pick out the wrong statement.

A. Fluxing material like lime is added in clay to reduce the vitrification temperature.
B. Main constituents of clay are alumina and silica.
C. Addition of sand in ceramic materials makes it non-plastic, increases its fusion point and reduces its shrinkage on burning.
D. Vitrification of fireclay material is done to increase its porosity.

Answer: Option D

Explanation:

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23. 

Because of its very high refractoriness of the order of __________ °C, silicon carbide refractories are used in zinc smelting furnace, muffle furnace and for supporting the wares in tunnel kilns.

A. 1800
B. 2200
C. 2400
D. 2700

Answer: Option D

Explanation:

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24. 

Chrome magnesite bricks are

A. acidic in nature.
B. neutral in nature.
C. having higher RUL than silica bricks.
D. made by mixing 30% chromite and 70% periclase.

Answer: Option C

Explanation:

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