Question:
Conditions for Dephosphorisation of Molten Iron is
Conditions for Dephosphorisation of Molten Iron is
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De-P needs "OB": Oxidizing and Basic. In contrast, De-S needs Reducing and Basic.
Updated On: Jul 4, 2026
- Oxidising and neutral slag
- Oxidising and Basic Slag
- Reducing and neutral slag
- Reducing and Acidic Slag
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The Correct Option is B
Solution and Explanation
Step 1: Concept Dephosphorization is the removal of phosphorus from molten metal into the slag phase.
Step 2: Meaning Phosphorus must first be oxidized to $P_{2}O_{5}$ and then stabilized in the slag.
Step 3: Analysis High oxygen potential (oxidizing conditions) is required for $P \rightarrow P_{2}O_{5}$. Since $P_{2}O_{5}$ is an acidic oxide, a basic slag (high CaO) is required to neutralize and hold it permanently in the slag.
Step 4: Conclusion Therefore, the necessary conditions are an oxidizing atmosphere and a basic slag. Final Answer: (B)
Step 2: Meaning Phosphorus must first be oxidized to $P_{2}O_{5}$ and then stabilized in the slag.
Step 3: Analysis High oxygen potential (oxidizing conditions) is required for $P \rightarrow P_{2}O_{5}$. Since $P_{2}O_{5}$ is an acidic oxide, a basic slag (high CaO) is required to neutralize and hold it permanently in the slag.
Step 4: Conclusion Therefore, the necessary conditions are an oxidizing atmosphere and a basic slag. Final Answer: (B)
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