Question:
__________ refractories are used in Hearth of Blast furnace
__________ refractories are used in Hearth of Blast furnace
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Blast furnace hearths commonly use carbon refractories because they resist molten iron and high-temperature attack.
Updated On: May 7, 2026
- Carbon
- Dolomite
- Magnesite
- Chromite
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The Correct Option is A
Solution and Explanation
Concept:
The hearth of a blast furnace is the lower part where molten iron and slag collect. It experiences very severe conditions.
Step 1: The hearth of a blast furnace is exposed to:
• very high temperature,
• molten metal,
• molten slag,
• chemical attack,
• mechanical wear.
Step 2: Carbon refractories have high thermal conductivity and good resistance to molten iron.
Step 3: Carbon blocks are commonly used in blast furnace hearths because they can resist severe service conditions.
Step 4: Dolomite, magnesite, and chromite refractories are used in other metallurgical furnaces, but the hearth of blast furnace commonly uses carbon refractories. Therefore, the correct answer is: \[ \boxed{\text{Carbon}} \]
Step 1: The hearth of a blast furnace is exposed to:
• very high temperature,
• molten metal,
• molten slag,
• chemical attack,
• mechanical wear.
Step 2: Carbon refractories have high thermal conductivity and good resistance to molten iron.
Step 3: Carbon blocks are commonly used in blast furnace hearths because they can resist severe service conditions.
Step 4: Dolomite, magnesite, and chromite refractories are used in other metallurgical furnaces, but the hearth of blast furnace commonly uses carbon refractories. Therefore, the correct answer is: \[ \boxed{\text{Carbon}} \]
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