Skull is not formed on the carbon blocks in the hearth of a blast furnace, when it becomes cold, because of its_______________?
Correct answer: C. Non-wetting characteristic
- A. High crushing strength
- B. High thermal conductivity
- C. Non-wetting characteristic
- D. None of these
Explanation
Carbon is poorly wetted by molten iron and slag, so the solidified material does not readily adhere to the carbon hearth and form a skull. High thermal conductivity may help cooling but is not the primary reason stated here.
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