Question:
Which of the following conditions favour dephosphorization in steel making?
Which of the following conditions favour dephosphorization in steel making?
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For effective phosphorus removal during steel refining, always remember: oxidizing conditions + basic slag = successful dephosphorization.
Updated On: Jun 20, 2025
- Acid slag and oxidizing atmosphere
- Basic slag and oxidizing atmosphere
- Acid slag and reducing atmosphere
- Basic slag and reducing atmosphere
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The Correct Option is B
Solution and Explanation
Dephosphorization is a crucial refining step in steelmaking aimed at removing phosphorus, which makes steel brittle.
The process is most effective under oxidizing conditions because phosphorus is oxidized to \(\text{P}_2\text{O}_5\), which can then be absorbed by the slag.
To retain this phosphate compound in the slag, a basic slag (rich in calcium oxide, CaO) is necessary, which stabilizes the \(\text{P}_2\text{O}_5\) as calcium phosphate.
Acid slags or reducing atmospheres are ineffective because they cannot sustain phosphorus in the oxidized form required for removal.
The process is most effective under oxidizing conditions because phosphorus is oxidized to \(\text{P}_2\text{O}_5\), which can then be absorbed by the slag.
To retain this phosphate compound in the slag, a basic slag (rich in calcium oxide, CaO) is necessary, which stabilizes the \(\text{P}_2\text{O}_5\) as calcium phosphate.
Acid slags or reducing atmospheres are ineffective because they cannot sustain phosphorus in the oxidized form required for removal.
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