Hot blast main (carrying air at 1000°C) in blast furnace are lined with ______________ bricks?
Correct answer: B. Fireclay
- A. Silica
- B. Fireclay
- C. Magnesite
- D. Zirconia
Explanation
Fireclay bricks are commonly used to line hot-blast mains because they withstand temperatures around 1000°C and are economical. Silica and magnesia refractories are reserved for more chemically or thermally severe zones.
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