Question:
\(\ldots\ldots\ldots\ldots\ldots\) refractories are used for Hearth of Blast furnace.
\(\ldots\ldots\ldots\ldots\ldots\) refractories are used for Hearth of Blast furnace.
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Blast furnace hearths commonly use carbon refractories because they resist molten iron and severe high-temperature conditions.
Updated On: May 7, 2026
- Magnesite
- Carbon
- Dolomite
- Silica
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The Correct Option is B
Solution and Explanation
The hearth of a blast furnace is the lower part of the furnace.
It is exposed to very severe operating conditions.
It comes in contact with molten iron, slag, and high temperature gases.
Therefore, the refractory used in the hearth must have excellent resistance to high temperature, slag attack, and molten metal attack.
Carbon refractories are commonly used in blast furnace hearths.
Carbon has high thermal conductivity.
It also has good resistance to attack by molten iron.
Because of these properties, carbon blocks are used in the hearth and bosh region of blast furnaces.
Magnesite and dolomite are basic refractories, but carbon is the suitable refractory for blast furnace hearth.
Silica is acidic and is not suitable for this region.
Hence, the correct answer is:
\[
\text{Carbon}.
\]
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