Advertisement

Reduction behavior and kinetics of vanadium–titanium sinters under high potential oxygen enriched pulverized coal injection

  • Jin-fang Ma
  • Guang-wei Wang
  • Jian-liang Zhang
  • Xin-yu Li
  • Zheng-jian Liu
  • Ke-xin Jiao
  • Jian Guo
Open Access
Article

Abstract

In this work, the reduction behavior of vanadium–titanium sinters was studied under five different sets of conditions of pulverized coal injection with oxygen enrichment. The modified random pore model was established to analyze the reduction kinetics. The results show that the reduction rate of sinters was accelerated by an increase of CO and H2 contents. Meanwhile, with the increase in CO and H2 contents, the increasing range of the medium reduction index (MRE) of sinters decreased. The increasing oxygen enrichment ratio played a diminishing role in improving the reduction behavior of the sinters. The reducing process kinetic parameters were solved using the modified random role model. The results indicated that, with increasing oxygen enrichment, the contents of CO and H2 in the reducing gas increased. The reduction activation energy of the sinters decreased to between 20.4 and 23.2 kJ/mol.

Keywords

ore reduction sintering oxygen enrichment pulverized coal injection kinetic models 

Notes

Acknowledgments

This work was financially supported by the Fundamental Research Funds for Central Universities (FRF-TP-15-063A1).

References

  1. [1]
    X.P. Hu and M.Y. Liu, Application research on a high grade brazilian concentrates in sintering process, Res. Iron Steel, 38(2010, No. 2, 17.Google Scholar
  2. [2]
    L.J. Yan, S.L. Wu, Y. You, Y.D. Pei, and L.H. Zhang, Assimilation of iron ores and ore matching method based on complementary assimilation, J. Univ. Sci. Technol. Beijing, 32(2010, No. 3, 298.Google Scholar
  3. [3]
    J.G. Hu and Z.M. Gao, Characteristics of Marra Mamba iron ore fines and the application technology in sintering process, Res. Iron Steel, 36(2008, No. 5, 25.Google Scholar
  4. [4]
    H.G. Li, G. An, Z.X. Zhao, and S.H. Ou, Experimental research on sintering performances of imported powder iron ores with high and medium ignition loss, Met. Mine, No. 8(2006), p. 41.Google Scholar
  5. [5]
    C.S. Deng, The reduction behavior and iron slag formation characteristics of vanadium–titanium sinter in blast furnace by dissecting 0.8 m3 blast furnace, Sichuan Metall., No. 2 (1985), p. 4.Google Scholar
  6. [6]
    S.S. Liu, Y.F. Guo, G.Z. Qiu, T. Jiang, and F. Chen, Solid-state reduction kinetics and mechanism of pre-oxidized vanadium–titanium magnetite concentrate, Trans. Nonferrous Met. Soc. China, 24(2014), No. 10, p 3372.CrossRefGoogle Scholar
  7. [7]
    Y.Q. Bai, S.S. Cheng, H.B. Zhao, and S.F. Huo, Study of V–Ti sinter reduction degradation by mineralogical analysis, Sintering Pelletizing, 36(2011, No. 2, 1.Google Scholar
  8. [8]
    Q. Lu, F.M. Li, W.S. Wang, and B.S. Hu, Influence of w(MgO) on sinter strength and sintering process of vanadium–titanium magnetite, Res. Iron Steel, 35(2007, No. 1, 5.Google Scholar
  9. [9]
    M. Zhou, S.T. Yang, T. Jiang, and X.X. Xue, Influence of MgO in form of magnesite on properties and mineralogy of high chromium, vanadium, titanium magnetite sinters, Ironmaking Steelmaking, 42(2015, No. 3, 217.CrossRefGoogle Scholar
  10. [10]
    Z.G. Liu, M.S. Chu, H.T. Wang, W. Zhao, and X.X. Xue, Effect of MgO content in sinter on the softening-melting behavior of mixed burden made from chromium-bearing vanadium–titanium magnetite, Int. J. Miner. Metall. Mater., 23(2016, No. 1, 25.CrossRefGoogle Scholar
  11. [11]
    G.Q. Yang, J.L. Zhang, J.G. Shao, Y.C. Wen, J.T. Rao, and W.G. Fu, Influence of vanadium titano-magnetite concentrate proportion on metallurgical properties of V-Ti bearing sinter, Sintering Pelletizing, 37(2012, No. 2, 6.Google Scholar
  12. [12]
    Y.P. Sun, P.J. Liu, J.L. Lü, and J. Wang, Practice of blast furnace protection with titanium-containing sinter, Iron Steel Vanadium Titanium, 34(2013, No. 5, 48.Google Scholar
  13. [13]
    J.J. Zhu and W.Z. Wang, Effects of PCI with oxygen enriched blast on the temperature field of the middle and upper zone in BF, Iron Making, 13(1994, No. 4, 19.Google Scholar
  14. [14]
    A. Babich, S. Yaroshevskii, A. Formoso, A. Isidro, S. Ferreira, A. Cores, and L. Garcia, Increase of pulverized coal use efficiency in blast furnace, ISIJ Int., 36(1996, No. 10, 1250.CrossRefGoogle Scholar
  15. [15]
    H. Ghanbari, F. Pettersson, and H. Saxén, Sustainable development of primary steelmaking under novel blast furnace operation and injection of different reducing agents, Chem. Eng. Sci., 129(2015, 208.CrossRefGoogle Scholar
  16. [16]
    Y.S. Shen, B.Y. Guo, A.B. Yu, and P. Zulli, Model study of the effects of coal properties and blast conditions on pulverized coal combustion, ISIJ Int., 49(2009, No. 6, 819.CrossRefGoogle Scholar
  17. [17]
    C.J. Yan, X.L. Cheng, J.J. Gao, and Y.S. Zhou, Effect of high oxygen enrichment PCI on BF blast ironmaking, Iron Steel, 48(2013, No. 6, 25.Google Scholar
  18. [18]
    Z.Q. Hao, X.C. Li, and Q. Wang, Effect of metallization degree of burden on ironmaking operation of BF with oxygen enriched blast and coal injection, J. Iron Steel Res., 12(2000), Suppl.1, p. 81.Google Scholar
  19. [19]
    G.W. Wang, J.L. Zhang, J.G. Shao, H.B. Zuo, and J.Q. Qiu, Model for economic evaluation of iron production with oxygen- enriched and pulverized coal injection, Iron Steel, 48(2013, No. 11, 21.Google Scholar
  20. [20]
    J.X. Li, P. Wang, and L.Y. Zhou, Technique of oxygen blast furnace with high injection of PC and hydrogenous fuel, J. Iron Steel Res., 21(2009, No. 6, 13.Google Scholar
  21. [21]
    J. Szekely and J.W. Evans, A structural model for gas–solid reactions with a moving boundary, Chem. Eng. Sci., 25(1970, No. 6, 1091.CrossRefGoogle Scholar
  22. [22]
    J. Ochoa, M.C. Cassanello, P.R. Bonelli, and A.L. Cukierman, CO2 gasification of Argentinean coal chars: a kinetic characterization, Fuel Process. Technol., 74(2001, No. 3, 161.Google Scholar
  23. [23]
    S. Kasaoka, Y. Sakata, and C. Tong, Kinetic evaluation of the reactivity of various coal chars for gasification with carbon dioxide in comparison with stream, Int. Chem. Eng., 25(1985, No. 1, 160.Google Scholar
  24. [24]
    J.Y. Shang and E.E. Wolf, Kinetic and FTIR studies of the sodium-catalyzed steam gasification of coal char, Fuel, 63(1984, No. 11, 1604.Google Scholar
  25. [25]
    C. Shuai, Y.Y. Bin, S. Hu, J. Xiang, L.S. Sun, S. Su, K. Xu, and C.F. Xu, Kinetic models of coal char steam gasification and sensitivity analysis of the parameters, J. Fuel Chem. Technol., 41(2013, No. 5, 558.Google Scholar
  26. [26]
    J.L. Zhang, G.W. Wang, J.G. Shao, and H.B. Zuo, A modified random pore model for the kinetics of char gasification, BioResources, 9(2014, No. 2, 3497.Google Scholar

Copyright information

© The Author(s) 2017

Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

Authors and Affiliations

  • Jin-fang Ma
    • 1
  • Guang-wei Wang
    • 1
  • Jian-liang Zhang
    • 1
  • Xin-yu Li
    • 2
  • Zheng-jian Liu
    • 1
  • Ke-xin Jiao
    • 1
  • Jian Guo
    • 1
  1. 1.School of Metallurgical and Ecological EngineeringUniversity of Science and Technology BeijingBeijingChina
  2. 2.Plans and Operations DepartmentWanbao Mining Ltd.BeijingChina

Personalised recommendations