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Effect of V2O5 During Oxidation Roasting of Pellet: Non-isothermal Kinetic Analysis and Microstructure Evolution

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Abstract

The influence of V2O5 of iron ore during oxidation process was examined by thermogravimetric analysis using a non-isothermal thermogravimetric analysis technology. The oxidation process could be divided into two stages. The kinetic mechanism and apparent activation energy (E) were studied using the Coats–Redfern (C–R) method. The obtained results showed that diffusion model was the best mechanism describing effectively oxidation process of iron ore under different V2O5. The values of E showed a decreasing trend with the increase of V2O5 addition in the whole oxidation process, indicating that the V2O5 was conducive to improve the oxidation kinetic conditions. And the fluctuation amplitude of E at stage II (10.489 kJ/mol) was greater than that at stage I (4.019 kJ/mol). With the amount of V2O5 increasing, microstructure study of pellets indicated that the growth pattern of grains was disrupted, resulting in abnormal grain growth and an increase in porosity. Thus, the loose structure of pellets could facilitate the internal diffusion of reaction gas at this moment. The oxidation kinetic conditions were improved and the values of E decreased ultimately.

Graphical Abstract

Oxidation kinetic analysis of the iron ore with different V2O5 additions.

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Acknowledgements

The authors are especially grateful to the National Natural Science Foundation of China (Grant No. 51904063), Science and Technology Plan Project of Liaoning Province (2022JH24/10200027), the Key Research and Development Project of Hebei Province (21314001D), the Seventh Batch of Ten Thousand Talents Plan (ZX20220553) and Central University Basic Scientific Research Business Expenses Special Funds (N2225046).

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Authors and Affiliations

  1. School of Metallurgy, Northeastern University, Shenyang, People’s Republic of China

    Jinge Feng, Jue Tang & Zichuan Zhao

  2. Institute for Frontier Technologies of Low-carbon Steelmaking, Northeastern University, Shenyang, People’s Republic of China

    Jinge Feng & Zichuan Zhao

  3. Liaoning Low-Carbon Steelmaking Technology Engineering Research Center, Northeastern University, Shenyang, People’s Republic of China

    Jinge Feng, Zichuan Zhao & Mansheng Chu

  4. Engineering Research Center of Frontier Technologies for Low-carbon Steelmaking (Ministry of Education), Shenyang, People’s Republic of China

    Jue Tang & Mansheng Chu

  5. Iron and Steel Research Institute of HBIS Group Co., Ltd., Shijiazhuang, 050000, China

    Xiaoai Wang

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  1. Jinge Feng
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Contributions

JF: investigation, writing-original draft. JT: writing-review and editing. XW: methodology. ZZ: investigation. MC: data curation.

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Correspondence to Jue Tang or Mansheng Chu.

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The contributing editor for this article was Hongmin Zhu.

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Feng, J., Tang, J., Wang, X. et al. Effect of V2O5 During Oxidation Roasting of Pellet: Non-isothermal Kinetic Analysis and Microstructure Evolution. J. Sustain. Metall. 10, 110–125 (2024). https://doi.org/10.1007/s40831-023-00777-z

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