Kinetics of Reaction Important in Oxygen Steelmaking

  • Kenneth S. Coley
  • Elaine Chen
  • Michael Pomeroy
Conference paper


Recent work on modeling of BOF steelmaking is reviewed, highlighting the critical aspects of each approach. It is concluded that the most successful models should be based on a deep understanding of the mechanisms and kinetics of the critical reactions. The importance of the decarburization mechanism is discussed with particular reference to its role in droplet swelling or bloating which has a profound influence on the droplet residence time in the slag. Conditions which cause bloating are discussed and the rate determining step is proposed to be primarily nucleation of CO bubbles inside the metal droplet with some influence from growth by reaction at the bubble/metal interface. The discrepancy in the super-saturation ratio required for classical nucleation is discussed and an approach using a surface tension modifying parameter is illustrated. Finally, the role of CO nucleation in controlling the driving force for dephosphorization is discussed.


Steelmaking BOF Modelling Kinetics of Droplet Decarburization 


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  1. 1.
    S. Ohguchi, D.G.C. Robertson, B. Deo, P. Grieveson, and J.H.E Jeffes, “Simultaneous Dephosphorization And Desulphurization Of Molten Pig Iron,” Ironmaking and Steel making, v 11, (1984)202–213.Google Scholar
  2. 2.
    D.G.C. Robertson, B. Deo, and S. Ohguchi, “Multicomponent Mixed-Transport-Control Theory For Kinetics Of Coupled Slag/Metal And Slag/Metal/Gas Reactions: Application To Desulphurization Of Molten Iron,” Ironmaking and Steelmaking, 11 (1984) 41–55.Google Scholar
  3. 3.
    K.J. Graham, and G.A. Irons, “Toward Integrated Ladle Metallurgy Control” Iron and Steel Technology, 6 (1) (2009), 164–173.Google Scholar
  4. 4.
    E. Chen, and K. S. Coley, “Kinetic Study of Droplet Swelling in BOF Steelmaking,” Ironmaking & Steelmaking 37 (7) (2010), 541–545.CrossRefGoogle Scholar
  5. 5.
    N. El-Kaddah and D. Robertson, “The Nucleation of CO Bubbles in Molten Iron Carbon Drops Reacting with Oxidizing Gases,” Metallurgical Transactions B 19 (6) (1988), 831–837.CrossRefGoogle Scholar
  6. 6.
    N. El-kaddah, and D. Robertson, “Homogeneous Nucleation of Carbonmonoxide in Iron Drops” J. Colloid and Interface Science, 60 (1977) 349–360.CrossRefGoogle Scholar
  7. 7.
    S Kitamura, “Importance of Kinetic Models in the Analysis of Steelmaking Reactions”, Steel Research int. 81 (9) (2010) 766–771CrossRefGoogle Scholar
  8. 8.
    C. Kattenbelt, and B. Roffel, “Dynamic Modeling of the Main Blow in Basic Oxygen Steelmaking Using Measured Step Responses,” Metall and Mater Trans B, 39 (2008) 764–769CrossRefGoogle Scholar
  9. 9.
    G. Li, B. Wang, Q. Liu, X. Tian, R. Zhu, L. Hu, and G. Cheng, “A process Model for BOF Process Based on Bath Mixing Degree,” International Journal of Minerals, Metallurgy and Materials, 17 (6) (2010), 715–722CrossRefGoogle Scholar
  10. 10.
    A. K. Shulda, B. Deo, S. Millman, B. Snoeijer, A. Overbosch, and A. Kapilashrami, “An Insight into the Mechanism and Kinetics of Reactions In BOF Steelmaking: Theory vs Practice,” Steel Research Int. 81 (2010) 940–948.CrossRefGoogle Scholar
  11. 11.
    N. Dogan, G. A. Brooks, and M. A. Rhamdhani, “Comprehensive Model of Oxygen Steelmaking Part 1: Model Development and Validation,” ISI J International, 51 (7) (2011), 1086–1092.CrossRefGoogle Scholar
  12. 12.
    N. Dogan, G. A. Brooks, and M. A. Rhamdhani, “Comprehensive Model of Oxygen Steelmaking Part 2: Application of Bloated Droplet Theory for Decarburization in Emulsion Zone,” ISI J International, 51 (7) (2011), 1093–1101.CrossRefGoogle Scholar
  13. 13.
    N. Dogan, G. A. Brooks, and M. A. Rhamdhani, “Comprehensive Model of Oxygen Steelmaking Part 3: Decarburization in Impact Zone,” ISI J International, 51 (7) (2011), 1102–1109.CrossRefGoogle Scholar
  14. 14.
    C. Cicutti, M. Valdez, T. Perez, R. Donayo, and J. Petroni, “Analysis of Slag Foaming During the Operation of an Industrial Converter,” J. Latin Am. Appl. Res., 32 (2002) 237.Google Scholar
  15. 15.
    C. Cicutti, M. Valdez, T. Pérez, J. Petroni, A Gómez, R. Donayo, L. Ferro, “Study Of Slag-Metal Reactions In An Ld-Lbe Converter,” 6th International Conference on Molten Slags, Fluxes and Salts, Stockholm-Helsinki, 2000,Google Scholar
  16. 16.
    Subagyo, G.A. Brooks, and K. Coley: “Residence Time of Metal Droplets in Slag-Metal -Gas Emulsions through Top Gas Blowing,” Canadian Metallurgical Quarterly, 44 (1) (2005), 119–129.CrossRefGoogle Scholar
  17. 17.
    Subagyo, G.A. Brooks, K.S. Coley, and G.A. Irons, “Generation of Droplets in Slag-Metal Emulsions Through Top Gas Blowing,” ISI J Int., 43 (7) (2003), 983–989CrossRefGoogle Scholar
  18. 18.
    Subagyo, G.A. Brooks, and K. Coley, “Interfacial Area in Top Blown Oxygen Steelmaking”, Steelmaking Conference Proceedings, ISS, Warrendale Pa., 85 (2002), 749–762.Google Scholar
  19. 19.
    G. A. Brooks, Y. Pan, Subagyo and K. S. Coley “Modeling of Trajectory and Residence Time of Metal Droplets in Slag-Metal-Gas Emulsions in Oxygen Steelmaking,” Metall and Mater Trans B, 36B (2005), 525–535.CrossRefGoogle Scholar
  20. 20.
    R. Li, and R. Harris, “Interaction Of Gas Jets With Model Process Liquids Proceedings Of Pyrometallurgy” 95, I.M.M, London, 1995, 235.Google Scholar
  21. 21.
    B. Deo, and R. Boom,: Fundamentals of Steelmaking Metallurgy, Prentice Hall,Google Scholar
  22. 22.
    Q.L. He, and N. Standish, “A Model Study Of Droplet Generation In The BOF Steelmaking,” ISI J International, 30 (1990), 305–309.CrossRefGoogle Scholar
  23. 23.
    M. Alam, J. Nasr, G. Brooks, and A. Fontana, “A Computational Fluid Dynamics Model of Shrouded Supersonic Jet Impingement on a Water Surface,” ISI J Int, 52(2012), 1026–1035.CrossRefGoogle Scholar
  24. 24.
    S.C. Koria, and K. W. Lange, “A New Approach To Investigate The Drop Size Distribution In Basic Oxygen Steelmaking,” Metall. Trans. B, 15B, (1984) 109–116CrossRefGoogle Scholar
  25. 25.
    C.L. Molloseau and R.J. Fruehan, “The Reaction Behavior Of Fe-C-S Droplets In CaO-SiO2-MgO-FeO Slags,” Metall. Trans. B, 33B (2002), 335–344.CrossRefGoogle Scholar
  26. 26.
    E.W. Mulholland, G.S.F. Hazeldean, and M.W. Davies, “Visualization Of Slag-Metal Reactions By X-Ray Fluoroscopy: Decarburization In Basic Oxygen Steoimaking,” Journal of The Iron and Sea Institute, 211(1973), 632–639.Google Scholar
  27. 27.
    D.J. Min, and R.J. Fruehan, “Rate Of Reduction Of FeO In Slag By Fe-C Drops,” Metall Trans B, 23B (1992), 29–37.CrossRefGoogle Scholar
  28. 28.
    G.G. Krishna Murthy, Y. Sawada, and J.F. Elliott, “Reduction of FeO Dissolved in CaO-SiO2-A1203 Slags by Fe-C Droplets,” Ironmaking and Seelmaking, 20 (3) (1993)179–190.Google Scholar
  29. 29.
    G.G. Krishna Murthy, A. Hasham, and U.B. Pal, “Reduction Rates of FeO Dissolved in CaO-SiO2-Al2O3 Slags by Fe-C Droplets,” Ironmaking and Seel making, 20 (3) (1993) 191–200Google Scholar
  30. 30.
    T. Gare and G.S.F. Hazeldean, “Basic Oxygen Steelmaking: Decarburization of Binary Fe-C Droplets and Ternary Fe-C-X Droplets in Ferruginous Slags,” Ironmaking and Seel making, (4) (1981), 169–181.Google Scholar
  31. 31.
    H. Gaye and P. V. Riboud, “Oxidation Kinetics of Iron Alloy Drops in Oxidizing Slags,” Metallurgical Transactions B, 8B, (9) (1977), 409–415.CrossRefGoogle Scholar
  32. 32.
    E. Chen, “Kinetic Study of Droplet Swelling in BOF Steelmaking” PhD Thesis, McMaster University 2011Google Scholar
  33. 33.
    M. Pomeroy, G. Brown, and K.S. Coley, “Mechanism of Enhanced Cr203 Reduction by Liquid Fe-C in Steelmaking Slags,” AISTech — Iron and Steel Technology Conference Proceedings, 2011, 1267–1276.Google Scholar
  34. 34.
    K. S. Coley and G. Brown, “Kinetics of BOF Steelmaking,” International conference on the Technology of Ironmaking and Steelmaking, Jamshedphur, India, Dec 16–18, 2013Google Scholar
  35. 35.
    M. Pomeroy, E. Chen, K. S. Coley and G. Brown, “Kinetic Study of Droplet Swelling in BOF Steelmaking” Proceedings of the European Oxygen Steelmaking Conference, Stockholm, Sweden September 2011.Google Scholar
  36. 36.
    P. G. Bowers, K. Bar-Eli and R. M. Noyes. “Unstable Supersaturated Solutions of Gases and Nucleation Theory” Journal of Chemical Society, Faraday Transactions, 92(1996), 2843–2849.CrossRefGoogle Scholar
  37. 37.
    S.D. Lubetkin. “Why Is It Much Easier to Nucleate Gas Bubbles Than Theory Predicts?” Langmuir, 19 (2003), 2575–2587CrossRefGoogle Scholar
  38. 38.
    M. D. Pomeroy, “Decarburization Kinetics of Fe-C-S Droplets in Oxygen Steelmaking Slags,” MASc Thesis McMaster University 2011Google Scholar
  39. 39.
    H. Sun, “Reaction Rates And Swelling Phenomenon Of Fe-C Droplets In FeO Bearing Slag,” ISI J Int., 46 (2006), 1560–1569.CrossRefGoogle Scholar
  40. 40.
    B.J. Monaghan, R.J. Pomfret, and K.S. Coley, “The Kinetics of Dephosphorization of Carbon-Saturated Iron Using an Oxidizing Slag”, Metall and Mater Trans B, 29B (1998), 111–118.CrossRefGoogle Scholar
  41. 41.
    P. Wei, M. Sano, M. Hirasawa, and K. Mori, “Kinetics Of Phosphorus Transfer Between Iron-Oxide Containing Slag And Molten Iron Of High-Carbon Concentration Under Ar-02 Atmosphere,” ISI J. Int, 33 (1993), 479–87.CrossRefGoogle Scholar
  42. 42.
    P. Wei, M. Ohya, M. Sano, and K. Mori, “Estimation Of Slag Metal Interfacial Oxygen Potential In Phosphorus Reaction Between Fe(T)O Containing Slag And Molten Iron Of High-Carbon Concentration” ISI J. Int. , 33 (1993), 847–54.CrossRefGoogle Scholar
  43. 43.
    K. S. Coley, M Pomeroy, G. Brown and E. Chen, “Kinetics of CO Nucleation During Slag Metal Reactions” Guthrie Honorary Symposium, June 6–9 2011, Montreal, CanadaGoogle Scholar
  44. 44.
    N. W. Jones, “Desulphurisation Kinetics of Fe — C — S Alloys by CaO ~ A1203 Based Slags at 1550 °C to 1650 °C,” PhD Thesis University of Strathclyde, 1996Google Scholar
  45. 45.
    G. Brown and B Jamieson, McMaster University Unpublished WorkGoogle Scholar

Copyright information

© TMS (The Minerals, Metals & Materials Society) 2014

Authors and Affiliations

  • Kenneth S. Coley
    • 1
  • Elaine Chen
    • 2
  • Michael Pomeroy
    • 1
  1. 1.Master Steel Research Centre, Department of Materials Science and EngineeringMcMaster UniversityHamilton, OntarioCanada
  2. 2.Arcelor-Mittal, Global R&DEast ChicagoUSA

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