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Role of Heat Transfer in Early Stage Decarburization of DRI in Slag

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Abstract

The gas generation from reactions between direct reduced iron (DRI) pellets and steelmaking slags is known to take place in two stages; (1) the reaction of FeO and carbon within DRI, i.e., pellet internal reaction, followed by (2) the reduction of slag FeO with DRI carbon at the pellet–slag interface, if any carbon remains from the first step. To understand the controlling mechanism of the reaction between FeO and C inside DRI, the rate of the gas release and the temperature of pellets suspended in a slag-free atmosphere were quantified. The results were used to determine the apparent thermal conductivity of DRI that showed values of approximately 0.5 to 2 W.m−1.K−1 for a temperature range of 573 K to 1273 K (300 °C to 1000 °C). Furthermore, it was found that the experimental gas evolution rates are consistent with the values predicted by a heat–transfer based model, confirming that the FeO-C reaction within pellet is controlled by the rate of heat transfer from the slag to the DRI pellet.

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References

  1. N.N. Jha, R.K.P. Singh, K.P. Jagannathan, S. Jha Ajit, R.P. Singh, B.A. Kumar, S.R. Sahu, S.B. Singh, P.K. Bose, A.M. Pande, S.K. Biswas, and K.N. Gupta: NML Tech. J., 1987, vol. 29, nos. 1–4, pp. 25–32.

    CAS  Google Scholar 

  2. M. Hein and M. Abel: SEAISI Quart., 2009, vol. 38, no. 2, pp. 68–73.

    CAS  Google Scholar 

  3. R. Verma: SEAISI Quart., 1991, vol. 20, no. 4, pp. 54.

    CAS  Google Scholar 

  4. M. Klemm and K. Stercken: Wire J. Int., 1998, vol. 31, no. 12, pp. 88–94.

    CAS  Google Scholar 

  5. G.L. Dressel: Iron Steelmaker, 1999, vol. 26, 1, pp. 53–55.

    Article  CAS  Google Scholar 

  6. D. Trotter, D. Varcoe, R. Reeves, and S.H. Anderson: SEAISI Quart., 2002, vol. 31, no. 2, pp. 39–50.

    CAS  Google Scholar 

  7. D. Anghelina, G.A. Irons, and G.A. Brooks: Association for Iron and Steel Technology, AISTech Conf. Proc., Charlotte, NC, 2005, pp. 403–12.

  8. R. Lule, F. Lopez, J. Espinoza, R. Torres, and R.D. Morales: Association for Iron and Steel Technology, AISTech Conf. Proc., St. Louis, MO, 2009, pp. 489–98.

  9. P. Kaushik and R.J. Fruehan: Metall. Mater. Trans. B, 2006, vol. 37B, pp. 715–25.

    Article  CAS  Google Scholar 

  10. J. Kopfle and R. Hunter: Ironmaking Steelmaking, 2008, vol. 35, no. 4, pp. 254–59.

    Article  CAS  Google Scholar 

  11. K. Sadrnezhaad and J.F. Elliott: Iron Steel Int., 1980, vol. 53, pp. 327–39.

    CAS  Google Scholar 

  12. D.A. Goldstein, R.J. Fruehan, and B. Ozturk: Iron Steelmaker, 1999, vol. 26, pp. 49–61.

    Google Scholar 

  13. J. Li and M. Barati: Metall. Mater. Trans. B, 2009, vol. 40B, pp. 17–24.

    Article  CAS  Google Scholar 

  14. E. Sharifi and M. Barati: Metall. Mater. Trans. B, 2010, vol. 41B, pp. 1018–24.

    Article  CAS  Google Scholar 

  15. H.W. Gudenau, H.A. Freidrichs, and P.K. Rademacher: Archiv Das Eisenhuettenwesen, 1981, vol. 52, 7, pp. 261–64.

    CAS  Google Scholar 

  16. J.C.Y. Koh and A. Fortini: Int. J. Heat Mass Transf., 1973, vol. 16, 11, pp. 2013–22.

    Article  Google Scholar 

  17. F.P. Incropera: Fundamentals of Heat and Mass Transfer, 2001, Wiley, New York, NY.

  18. S.W. Churchill: Chem. Eng. Commun., 1983, vol. 24, nos. 4–6, pp. 339–52.

    Article  CAS  Google Scholar 

  19. T. Akiyama: ISIJ Int., 1992, vol. 32, pp. 829–37.

    Article  CAS  Google Scholar 

  20. L. Giguere: Direct from Midrex, 2000, vol. pp. 4–5.

  21. A. Bandopadhyay, A. Ganguly, K.N. Gupta, and H.S. Ray: Thermochim. Acta, 1996, vol. 276, pp. 199–207.

    Article  CAS  Google Scholar 

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Author notes

  1. Erfan Sharifi (Graduate Student, Engineer)

    Present address: Process Research Ortech Inc., Mississauga, ON, Canada

Authors and Affiliations

  1. Department of Materials Science and Engineering, University of Toronto, Toronto, ON, M5S 3E4, Canada

    Mansoor Barati (Professor) & Erfan Sharifi (Graduate Student, Engineer)

Authors
  1. Mansoor Barati
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  2. Erfan Sharifi
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Correspondence to Mansoor Barati.

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Manuscript submitted August 25, 2011.

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Barati, M., Sharifi, E. Role of Heat Transfer in Early Stage Decarburization of DRI in Slag. Metall Mater Trans B 43, 680–685 (2012). https://doi.org/10.1007/s11663-012-9657-z

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  • DOI: https://doi.org/10.1007/s11663-012-9657-z

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