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Thermodynamic study of direct reduction of high-chromium vanadium–titanium magnetite (HCVTM) based on phase equilibrium calculation model

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Abstract

High-chromium vanadium–titanium magnetite (HCVTM) is a good valuable resource with high iron content in the form of complex iron ore which contains various valuable metal elements such as iron, vanadium, titanium, chromium. Direct reduction of HCVTM is studied based on thermodynamic analysis. Combined TG experimental verification and equilibrium calculation model was used to analyze the reaction sequence and equilibrium amount in this paper. The contents in HCVTM reduction system are simplified as 18 kinds of chemical compositions. Reductions of Fe3O4 and FeO·TiO2 are the main reduction reactions and are mainly reduced by C. The reduction reaction sequence of FeO·TiO2 is FeO·TiO2, TiO2, TiC, and Ti; the reduction reaction sequence of Fe3O4 is Fe3O4, FeO, and Fe. The minimum reduction temperature of HCVTM is 860 °C. The reduction of Cr is difficult to implement, and the minimum reduction temperature of V is above 700 °C. The gas phase in this system is mainly CO when the temperature is above 1000 °C. CO partial pressure curve of gasification reaction is in the shape of ‘S’ with increase of temperature. When the temperature is 1350 °C, C/O is 1.0 and reduction time is 30 min, HCVTM can be reduced thoroughly and the reduction degree can reach to 0.98. When C/O is lower than 1.0, FeTi2O5 is the reduction intermediate products from FeO·TiO2. When C/O is 1.0, diffraction peaks of Fe3O4 and FeO·TiO2 disappear, and they are reduced to Fe and TiO2.

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Acknowledgements

The author will acknowledge the support from National Natural Science Foundation of China (Nos. 51604065 & 51674084), the Major State Research Development Program of China (Nos. 2017YFB0603800 & 2017YFB0603804), the Fundamental Funds for the Program of the Science Foundation of Liaoning Province (No. 20170540316), the Fundamental Research Funds for the Central Universities (No. N172507012).

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Authors and Affiliations

  1. School of Metallurgy, Northeastern University, NO 11, Lane 3, Wenhua Road, Heping District, P.O. Box 345, Shenyang, 110819, Liaoning, People’s Republic of China

    Mi Zhou, Tao Jiang, Xueyong Ding, Shihong Ma, Guo Wei & Xiangxin Xue

  2. Key Laboratory of Liaoning Province for Recycling Science of Metallurgical Resources, Shenyang, 110819, People’s Republic of China

    Mi Zhou, Tao Jiang & Xiangxin Xue

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  1. Mi Zhou
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  2. Tao Jiang
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  3. Xueyong Ding
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  4. Shihong Ma
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  5. Guo Wei
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  6. Xiangxin Xue
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Correspondence to Mi Zhou.

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Zhou, M., Jiang, T., Ding, X. et al. Thermodynamic study of direct reduction of high-chromium vanadium–titanium magnetite (HCVTM) based on phase equilibrium calculation model. J Therm Anal Calorim 136, 885–892 (2019). https://doi.org/10.1007/s10973-018-7687-8

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  • DOI: https://doi.org/10.1007/s10973-018-7687-8

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