Skip to main content
SpringerLink
Log in

Hematite Dissociation Mechanism and Kinetics in Iron Ore Pellets during Heat Treatment

  • Published:
Russian Metallurgy (Metally) Aims and scope

Abstract

The mechanisms of magnetite oxidation (forward reaction) and hematite dissociation (reverse reaction) are considered in terms of a general kinetic approach. The dissociation in a pellet is found to develop during sintering when temperature increases. A derivatograph is used to perform experiments with Kachkanar fluxed pellets at various heating rates in a gas containing various oxygen contents. The reaction surface and the dissociation rate are found to increase with the temperature and the slag-forming oxide content. The heating of samples in a reducing atmosphere is studied. The temperature range of reduction of partially dissociated pellets, in which their intense destruction induced by the hematite–magnetite transition does not occur, has been determined. Based on the results of analyzing the pore structure of a pellet, we conclude that, when a melt appears in the system, the dissociation in a pellet is associated with both liquid-phase sintering, when closed porosity forms, and an increase in temperature. The results obtained in this work are of great practical importance, since the use of partially dissociated pellets excludes hematite reduction in them at low temperatures and does not lead to a violation of the gasdynamic conditions of blast-furnace melting.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Log in via an institution

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Institutional subscriptions

Fig. 1.
Fig. 2.
Fig. 3.

Similar content being viewed by others

REFERENCES

  1. S. S. Kvon, “Role of the crystal chemical structure of magnetite during its oxidation,” Trudy Karaganda Gos. Tekh. Univ, No. 2, 30–32 (2003).

    Google Scholar 

  2. E. V. Gribanova, A. E. Kuchek, E. S. Vasil’eva, A. A. Voloshin, and V. V. Shutkevich, “Influence of the surface modification of magnetite and hematite on their surface properties,” Vestn. SPbGU, Ser. 4, No. 2, 73–79 (2007).

    Google Scholar 

  3. Y. Guo, J. Xie, J. Gao, H. Xu, and J. Qie, “Manufacture and metallurgical properties of fluxed pellets with a high hematite content,” Metallurg, No. 8, 33–39 (2017).

    Google Scholar 

  4. Yang Xue-Feng, “Mechanism of roasting and agglomeration on the pellets produced by blended iron ore fines of hematite and magnetite,” J. Iron Steel Res. 22 (2), 6 (2010).

    CAS  Google Scholar 

  5. T. Ya. Malysheva, Yu. S. Yusfin, and S. V. Plotnikov, “Technological aspects of the production of pellets from magnetite ores,” Izv. Vyssh. Uchebn. Zaved., Chern. Metall., No. 9, 3–5 (2011).

  6. S. V. Plotnikov and A. S. Bormotov, “Mechanism of the phase transformations during oxidative roasting of industrial pellets from the concentrates of ferrous quartzite ores,” Izv. Vyssh. Uchebn. Zaved., Chern. Metall., No. 3, 29–32 (2011).

  7. L. K. Kokorin and S. N. Leleko, Production of Oxidized Pellets: Technology, Equipment (Ural Tsentr PR Reklamy Marat, 2004).

    Google Scholar 

  8. A. G. Bulakh, A. A. Zolotarev, and V. G. Krivovichev, General Mineralogy (Akademiya, Moscow, 2008).

    Google Scholar 

  9. P. W. Readman and W. O. Reilly, “Oxidation processes in titanomagnetites,” Z. Geophis. B 37 (3), 329–338 (1971).

    Google Scholar 

  10. B. P. Yur’ev and N. A. Spirin, “Oxidation of iron-ore pellets,” Steel Trans. 41, 400–403 (2011).

    Article  Google Scholar 

  11. X. Y. Yang, Z. Q. Gong, and F. L. Liu, “Kinetics of Fe3O4 formation by air oxidation,” J. Central South Univ. Technol. 11 (2), 152–155 (2004).

    Article  CAS  Google Scholar 

  12. A. Sardari, E. K. Alamdari, and S. Z. Shafaei, “Kinetics of magnetite oxidation under nonisothermal conditions,” Int. J. Miner. Met. Mater. 24 (5), 486–492 (2017).

    Article  CAS  Google Scholar 

  13. W. Li, G. Q. Fu, et al., “Oxidation induration process and kinetics of Hongge vanadium titanium-bearing magnetite pellets,” Ironmaking & Steelmaking 44 (4), 294–303 (2017).

    Article  CAS  Google Scholar 

  14. T. K. S. Kumar, N. N. Viswanathan, et al., “Investigation of magnetite oxidation kinetics at the particle scale,” Met. Mater. Trans. B. Proc. Met. Mater. Proc. Sci. 50 (1), 150–161 (2019).

    Article  Google Scholar 

  15. V. M. Abzalov, V. A. Gorbachev, S. N. Evstyugin, et al., Physicochemical and Thermal Engineering Fundamentals of Iron Ore Pellet Production, Ed. by L. I. Leont’ev (MITs, Yekaterinburg, 2015).

  16. R. Q. Liang, S. Yang, et al., “Kinetics of oxidation reaction for magnetite pellets,” J. Iron Steel Res. Int. Sep. 20 (9), 16–20 (2013).

  17. T. K. S. Kumar, N. N. Viswanathan, et al., “Developing the oxidation kinetic model for magnetite pellet,” Met. Mater. Trans. B. Proc. Met. Mater. Proc. Sci. 50 (1), 162–172 (2019).

    Article  Google Scholar 

  18. A. K. Zaitsev, S. A. Makeev, V. S. Valavin, and Yu. V. Pokhvisnev, “Dissociation of hematite during dissolution in slag,” Izv. Vyssh. Uchebn. Zaved., Chern. Metall., No. 7, 57–61 (2013).

  19. B. P. Yur’ev, L. B. Bruk, N. A. Spirin, et al., Fundamentals of the Theory of the Processes during Roasting of Iron Ore Pellets (NTI UrFU, Nizhny Tagil, 2018).

  20. Yu. S. Zhukov, N. G. Korshunova, V. Ya. Rekhter, et al., “Dissociation of the hematite of iron ore pellets in combined installations,” Izv. Vyssh. Uchebn. Zaved., Chern. Metall., No. 6, 17–20 (1984).

  21. G. G. Mikhailov, B. I. Leonovich, and Yu. S. Kuznetsov, Thermodynamics of Metallurgical Processes and Systems (Izd. Dom MISiS, Moscow, 2009).

  22. O. A. Yesin and P. V. Gel’d, Physical Chemistry of Pyrometallurgical Processes. Part1 (Metallurgizdat, Sverdlovsk, 1962).

    Google Scholar 

  23. A. N. Shapovalov, Theory of Metallurgical Processes (NFNITU MISiS, Novotroitsk, 2015).

  24. B. V. Kachula, “Volumetric changes and strength properties of pellets made of titanium–magnetic concentrates during reduction,” Candidate’s Dissertation in Engineering (Inst. Metallurg. UrO RAN, Sverdlovsk, 1973).

  25. S. T. Rostovtsev, Theory of Metallurgical Processes (Metallurgizdat, Moscow, 1956).

    Google Scholar 

  26. Yu. N. Lopatin, “Hardening of partially oxidized pellets estimated from the kinetics of their oxidation and stressed state at the boundary of magnetite and hematite zones,” Candidate’s Dissertation in Engineering (Sverdlovsk, 1985).

Download references

Author information

Authors and Affiliations

  1. Institute of New Materials and Technologies, Ural Federal University, Yekaterinburg, Russia

    B. P. Yur’ev & V. A. Dudko

  2. Institute of Fundamental Education, Ural Federal University, Yekaterinburg, Russia

    E. A. Nikonenko

Authors
  1. B. P. Yur’ev
    View author publications

    You can also search for this author in PubMed Google Scholar

  2. V. A. Dudko
    View author publications

    You can also search for this author in PubMed Google Scholar

  3. E. A. Nikonenko
    View author publications

    You can also search for this author in PubMed Google Scholar

Corresponding author

Correspondence to B. P. Yur’ev.

Ethics declarations

The authors declare that they have no conflicts of interest.

Additional information

Translated by K. Shakhlevich

Rights and permissions

Reprints and permissions

About this article

Check for updates. Verify currency and authenticity via CrossMark

Cite this article

Yur’ev, B.P., Dudko, V.A. & Nikonenko, E.A. Hematite Dissociation Mechanism and Kinetics in Iron Ore Pellets during Heat Treatment. Russ. Metall. 2022, 481–487 (2022). https://doi.org/10.1134/S0036029522050123

Download citation

  • Received:

  • Revised:

  • Accepted:

  • Published:

  • Issue Date:

  • DOI: https://doi.org/10.1134/S0036029522050123

Keywords:

Search

Navigation