Question:
\(\ldots\ldots\ldots\ldots\ldots\) refractories are used in roof of Open-hearth furnace.
\(\ldots\ldots\ldots\ldots\ldots\) refractories are used in roof of Open-hearth furnace.
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Silica bricks are commonly used in open-hearth furnace roofs because they perform well at high temperatures under load.
Updated On: May 7, 2026
- Magnesite
- Chromite
- Silica
- Dolomite
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The Correct Option is C
Solution and Explanation
Open-hearth furnaces operate at high temperature.
The roof of such furnaces must withstand high temperature and load.
Silica refractories are widely used in furnace roofs because of their good refractoriness under load at high temperature.
Silica bricks also have good resistance to acidic slags and furnace gases.
They are commonly used in the roof of open-hearth furnaces, glass tank furnaces, and coke ovens.
Magnesite and dolomite are basic refractories.
Chromite refractories have special applications, but the common refractory for open-hearth furnace roof is silica.
Therefore, the refractory used in roof of open-hearth furnace is:
\[
\text{Silica}.
\]
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