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A thermodynamic model for predicting activity of CaO–SiO2–Al2O3–MgO–TiO2–V2O3–FeO slags during electric furnace smelting process

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Abstract

To optimize the comprehensive utilization of vanadium titanomagnetite by direct reduction-smelting processes, it is essential to acquire titanium slag with a higher TiO2 content of 45–60 wt.%. A thermodynamic model was developed based on the ion and molecule coexistence theory, specifically targeting the CaO–SiO2–Al2O3–MgO–TiO2–V2O3–FeO slag system. The impact of slag composition on the smelting of vanadium titanomagnetite was assessed, and the thermodynamic model was utilized to identify the optimal high-titanium slag. The results revealed that increasing the basicity, MgO content, and FeO content within the slag effectively suppressed the reduction of titanium and silicon oxides. Furthermore, the calculated activity coefficient of TiO2 decreased with higher basicity, MgO, and FeO levels. While an increase in basicity significantly enhanced the reduction of vanadium oxides, the effects of MgO and FeO contents on vanadium oxide reduction were comparatively less significant. Notably, higher basicity and FeO content promoted the formation of calcium titanates, whereas an elevated MgO content favored the formation of magnesium titanates. The smelting results indicated that a lower V2O3 content and higher TiO2 activity corresponded to a smaller titanium mass fraction in the iron alloy, while the opposite trend was observed for vanadium.

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Acknowledgements

The financial supports from the National Natural Science Foundation of China on the project 52104345 were acknowledged.

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Authors and Affiliations

  1. School of Minerals Processing and Bioengineering, Central South University, Changsha, 410083, Hunan, China

    Jian-fa Jing, Shuai Wang, Yu-feng Guo, Feng Chen, Ling-zhi Yang, Jian-feng Yang & Fu-chun Xu

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  1. Jian-fa Jing
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Correspondence to Shuai Wang.

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Shuai Wang, Feng Chen, and Ling-zhi Yang are youth editorial board members for Journal of Iron and Steel Research International and were not involved in the editorial review or the decision to publish this article. The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

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Jing, Jf., Wang, S., Guo, Yf. et al. A thermodynamic model for predicting activity of CaO–SiO2–Al2O3–MgO–TiO2–V2O3–FeO slags during electric furnace smelting process. J. Iron Steel Res. Int. (2024). https://doi.org/10.1007/s42243-024-01186-6

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