Mechanism of improved magnetizing roasting of siderite–hematite iron ore using a synergistic CO–H2 mixture

  • Qiang Zhao
  • Ji-lai XueEmail author
  • Wen Chen
Original Paper


A fluidized-bed magnetizing roasting–magnetic separation process was selected to treat this type of material. Phase transformations and microstructural changes in the product resulting from magnetizing roasting under different reducing gases (CO, H2, CO + H2) were clarified by vibrating sample magnetometry, X-ray diffraction, scanning electron microscopy, and energy-dispersive X-ray spectroscopy. The results indicated that the conversion ratio and saturation magnetization of samples roasted in a mixed gas of CO and H2 were higher than those of samples produced under CO or H2 alone. This indicated that synergy of the combined CO and H2 gas had a positive effect on the fluidized-bed magnetizing roasting process. The mechanism and kinetics of the improved magnetizing roasting of a siderite–hematite iron ore mixture under this synergistic CO–H2 system were investigated under isothermal conditions. The results indicated that the apparent activation energies of the reactions of the iron oxides decreased from 37.7 and 17.9 to 15.9 kJ/mol when the roasting atmosphere was changed from pure H2 or CO to a gas mixture of CO and H2, respectively. The mixed CO–H2 gas promoted the conversion ratio of hematite and siderite to magnetite, thereby improving the conversion ratio in the fluidized-bed magnetizing roasting process.


Siderite Hematite Mixed iron ore Fluidized-bed magnetizing roasting Kinetics Magnetite 



The authors would like to express their thanks to the National Natural Science Foundation of China (No. 5157041410) for the financial support of this research.

Author contributions

Qiang Zhao conducted the experimental work and prepared the manuscript; Ji-lai Xue directed the research work and modified the manuscript; Wen Chen participated in the design of the research work at different stages.


  1. [1]
    V.P. Ponomar, N.O. Dudchenko, A.B. Brik, Miner. Eng. 122 (2018) 277–284.CrossRefGoogle Scholar
  2. [2]
    E. Tekin, B. Varol, Z. Ayan, M. Satir, N. Jb. Miner. Monat. 2002 (2002) 289–318.Google Scholar
  3. [3]
    S.N. Rychagov, A.A. Nuzhdaev, I.I. Stepanov, Geochem. Int. 52 (2014) 131–143.CrossRefGoogle Scholar
  4. [4]
    O.B. Apukhtina, V.S. Kamenetsky, K. Ehrig, M.B. Kamenetsky, R. Maas, J. Thompson, J. McPhie, C.L. Ciobanu, N.J. Cook, Econ. Geol. 112 (2017) 1531–1542.CrossRefGoogle Scholar
  5. [5]
    S.J. Bai, M. Wu, C. Lü, S.M. Wen, J. Iron Steel Res. Int. 23 (2016) 891–899.CrossRefGoogle Scholar
  6. [6]
    L. Tankosić, P. Tančić, S. Sredić, Z. Nedić, Minerals 8 (2018) 119.CrossRefGoogle Scholar
  7. [7]
    T. Brachaniec, A. Wieczorek, Carnets Geol. 16 (2016) 349–354.CrossRefGoogle Scholar
  8. [8]
    S. Song, S. Lu, A. Lopez-Valdivieso, Miner. Eng. 15 (2002) 415–422.CrossRefGoogle Scholar
  9. [9]
    D.N. Obiora, M.N. Ossai, F.N. Okeke, A.I. Oha, J. Geol. Soc. India 88 (2016) 654–667.CrossRefGoogle Scholar
  10. [10]
    O.V. Avchenko, I.L. Zhulanova, K.V. Chudnenko, A.A. Karabtsov, Russ. J. Pac. Geol. 12 (2018) 174–189.CrossRefGoogle Scholar
  11. [11]
    T. Umadevi, K. Abhishek, R. Sah, K. Marutiram, Miner. Metall. Process. 35 (2018) 35–45.Google Scholar
  12. [12]
    F. Lagroix, Y. Guyodo, Front. Earth Sci. 5 (2017) 61.Google Scholar
  13. [13]
    H.Q. Hao, L.X. Li, Z.T. Yuan, J.T. Liu, J. Mol. Liq. 254 (2018) 349–356.CrossRefGoogle Scholar
  14. [14]
    S.J. Bai, S.M. Wen, D.W. Liu, W.B. Zhang, Y.J. Xian, ISIJ Int. 51 (2011) 1601–1607.CrossRefGoogle Scholar
  15. [15]
    Y.H. Zhang, J. Zhang, Y.J. Zhang, H.C. Li, P. Zhao, J. Wuhan Univ. Technol. 35 (2013) No.3, 116–119.Google Scholar
  16. [16]
    T.J. Chun, D.Q. Zhu, J. Pan, Miner. Process. Extr. Metall. Rev. 36 (2015) 223–226.CrossRefGoogle Scholar
  17. [17]
    C. Li, H.H. Sun, J. Bai, L.T. Li, J. Hazard. Mater. 174 (2010) 71–77.CrossRefGoogle Scholar
  18. [18]
    Z.J. Su, Y.B. Zhang, J. Chen, B.B. Liu, G.H. Li, T. Jiang, Sep. Sci. Technol. 51 (2016) 1900–1912.CrossRefGoogle Scholar
  19. [19]
    K. Zhang, X.L. Chen, W.C. Guo, H.J. Luo, Z.J. Gong, B.W. Li, W.F. Wu, PLoS One 12 (2017) e0186274.CrossRefGoogle Scholar
  20. [20]
    G.G.O.O. Uwadiale, Miner. Process. Extr. Metall. Rev. 11 (1992) 1–19.CrossRefGoogle Scholar
  21. [21]
    J.W. Yu, Y.X. Han, Y.J. Li, P. Gao, Int. J. Miner. Process. 168 (2017) 102–108.CrossRefGoogle Scholar
  22. [22]
    V.I. Matyukhin, S.G. Melamud, V.V. Shatsillo, O.V. Matyukhin, A.V. Matyukhina, Izvestiya Vysshikh Uchebnykh Zavedenij. Chernaya Metallurgiya 58 (2015) 652–657.CrossRefGoogle Scholar
  23. [23]
    V.I. Matyukhin, V.V. Shatsillo, A.V. Kuznetsov, D.V. Rybakin, A.F. Krokhalev, Metallurgist 61 (2017) 3–11.CrossRefGoogle Scholar
  24. [24]
    X.H. Wang, Z.H. Wang, J. Liu, F.P. Xiang, J.H. Zhou, K.F. Cen, J. Zhejiang Univ. Eng. Sci. 47 (2013) 675–679.Google Scholar
  25. [25]
    R.F. Wei, S.H. Feng, H.M. Long, J.X. Li, Z.S. Yuan, D.Q. Cang, C.B. Xu, Energy 140 (2017) 406–414.CrossRefGoogle Scholar
  26. [26]
    J. Tang, M.S. Chu, Z.W. Ying, F. Li, C. Feng, Z.G. Liu, Metals 7 (2017) 153.CrossRefGoogle Scholar
  27. [27]
    W. Li, G.Q. Fu, M.S. Chu, M.Y. Zhu, J. Iron Steel Res. Int. 24 (2017) 34–42.CrossRefGoogle Scholar
  28. [28]
    Y.L. Sui, Y.F. Guo, T. Jiang, X.L. Xie, S. Wang, F.Q. Zheng, Int. J. Miner. Metall. Mater. 24 (2017) 10–17.CrossRefGoogle Scholar
  29. [29]
    S.Y. Luo, C.J. Yi, Y.M. Zhou, Renew. Energ. 36 (2011) 3332–3336.CrossRefGoogle Scholar
  30. [30]
    Y.L. Sui, Y.F. Guo, T. Jiang, G.Z. Qiu, J. Alloy. Compd. 706 (2017) 546–553.CrossRefGoogle Scholar
  31. [31]
    Y. Li, Basic research on gas-based reduction of Indonesia ironsand oxidized pellets, University of Science and Technology Beijing, Beijing, China, 2015.Google Scholar
  32. [32]
    H. Ono-Nakazato, T. Yonezawa, T. Usui, ISIJ Int. 43 (2003) 1502–1511.CrossRefGoogle Scholar
  33. [33]
    Z.Q. Guo, D.Q. Zhu, J. Pan, F. Zhang, Minerals 7 (2017) 98.CrossRefGoogle Scholar
  34. [34]
    Z.Q. Guo, D.Q. Zhu, J. Pan, C.C. Yang, Powder Technol. 329 (2018) 55–64.CrossRefGoogle Scholar

Copyright information

© China Iron and Steel Research Institute Group 2019

Authors and Affiliations

  1. 1.School of Metallurgical and Ecological EngineeringUniversity of Science and Technology BeijingBeijingChina
  2. 2.Changsha Research Institute of Mining and Metallurgy Co., Ltd.ChangshaChina

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