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Phosphorus Partition between Liquid Steel and CaO-SiO2-P2O5-MgO Slag Containing Low FeO

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Abstract

CaO-SiO2-FeO x -P2O5-MgO bearing slags are typical in the basic oxygen steelmaking (BOS) process. The partition ratio of phosphorus between slag and steel is an index of the phosphorus holding capacity of the slag, which determines the phosphorus content achievable in the finished steel. The influences of FeO concentration and basicity on the equilibrium phosphorus partition ratios were experimentally determined at temperatures of 1873 and 1923 K, for conditions of MgO saturation. The partition ratio initially increased with basicity but attained a constant value beyond basicity of 2.5. An increase in FeO concentration up to approximately 13 to 14 mass pct was beneficial for phosphorus partition.

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Notes

  1. LECO is a trademark of LECO Corporation, St. Joseph, MI.

  2. THERMOCALC is a trademark of Thermo-Calc Software AB, Stockholm, Sweden.

  3. FACTSAGE is a trademark of GTT Technologies, Herzogenrath, Germany.

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Acknowledgments

The authors are indebted to Tata Steel, Jamshedpur, for financially supporting the investigations and providing complete chemical analysis of all the samples. The support extended by the Department of Materials Science and Engineering, Royal Institute of Technology, toward carrying out most of the experiments is also gratefully acknowledged.

The authors extend special thanks to their colleagues in Stockholm and Jamshedpur whose support and cooperation made the work possible.

Author information

Authors and Affiliations

  1. Research & Development, Tata Steel, Jamshedpur, 831001, India

    Somnath Basu (Researcher)

  2. Indian Institute of Science, Bangalore, 560012, India

    Ashok Kumar Lahiri (Professor)

  3. Royal Institute of Technology, Stockholm, 100 44, Sweden

    Seshadri Seetharaman (Professor)

Authors
  1. Somnath Basu
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  2. Ashok Kumar Lahiri
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  3. Seshadri Seetharaman
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Correspondence to Somnath Basu.

Additional information

Manuscript submitted August 21, 2006.

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Basu, S., Lahiri, A. & Seetharaman, S. Phosphorus Partition between Liquid Steel and CaO-SiO2-P2O5-MgO Slag Containing Low FeO. Metall Mater Trans B 38, 357–366 (2007). https://doi.org/10.1007/s11663-007-9057-y

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