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Phosphorus Partition between Liquid Steel and CaO-SiO2-FeO x -P2O5-MgO Slag Containing 15 to 25 Pct FeO

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Abstract

CaO-SiO2-FeO x -P2O5-MgO bearing slags are typically used 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 influence of factors such as FeO content and basicity on the phosphorus partition ratio was investigated at two different temperatures. The partition ratio initially increased with basicity but remained constant beyond a basicity of 2.5 to 2.6. An increase in the FeO content up to 18 to 20 mass pct was beneficial for the phosphorus partition at a basicity level of 2 to 3, but a higher concentration of FeO resulted in a decrease in the phosphorus partition ratio; the FeO concentration corresponding to this transition varied with basicity and temperature. At even lower basicities, however, the equilibrium phosphorus partition showed either no change, or a marginally decreasing trend, with an increase in the FeO content.

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  1. THERMOCALC is a trademark of ThermoCalc Software AB, Stockholm, Sweden.

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

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Acknowledgments

The authors are indebted to Tata Steel 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 numerous colleagues in Stockholm and in Jamshedpur whose support and cooperation made this work possible.

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Authors and Affiliations

  1. Research & Development, Tata Steel, Jamshedpur, 831 001, India

    Somnath Basu (Researcher)

  2. Indian Institute of Science, Bangalore, 560 012, 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.

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Manuscript submitted September 13, 2006.

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Basu, S., Lahiri, A.K. & Seetharaman, S. Phosphorus Partition between Liquid Steel and CaO-SiO2-FeO x -P2O5-MgO Slag Containing 15 to 25 Pct FeO. Metall Mater Trans B 38, 623–630 (2007). https://doi.org/10.1007/s11663-007-9063-0

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