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Equilibrium Phase Relations of the CaO-SiO2-Ti3O5 System at 1400 °C and a p(O2) of 10−16 atm

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Abstract

The phase relations of TiOx containing systems in reducing atmospheres are extremely important for understanding the smelting process for vanadium titano-magnetite. In the present work, the equilibrium phase relations for the core CaO-SiO2-Ti3O5 system at 1400 °C and oxygen partial pressure of 10−16 atm were determined. Ti3O5 was confirmed as the stable Ti oxide in CO(g)-C equilibrium, and the solid phases Ti3O5, 3CaO·Ti3O5, SiO2, and CaO·SiO2 were found to coexist with the liquid oxide within the composition range investigated. The 1400 °C isothermal phase diagram of the CaO-SiO2-Ti3O5 system was constructed to demonstrate the areas of single liquid, as well as the two-phase and three-phase domains. Furthermore, a comparison with results in the literature indicated that the single liquid domain at 1400 °C greatly shrinks when the oxygen partial pressure decreases from air to 10−16 atm, and the corresponding liquid coexisting phases of TiO2 and CaO·TiO2 transform to Ti3O5 and 3CaO·Ti3O5.

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Acknowledgements

This study received financial support from the China Postdoctoral Science Foundation (Grant numbers 2020TQ0059 and 2020M680967), the Natural Science Foundation of Liaoning Province (2021-MS-083), and the Fundamental Research Funds for the Central Universities (N2125010).

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Authors and Affiliations

  1. School of Metallurgy, Northeastern University, Shenyang, 110819, People’s Republic of China

    Junjie Shi, Yuchao Qiu, Fei Zhao & Jianzhong Li

  2. Key Laboratory for Ecological Metallurgy of Multimetallic Minerals (Ministry of Education), Northeastern University, Shenyang, 110819, People’s Republic of China

    Junjie Shi, Yuchao Qiu, Fei Zhao & Jianzhong Li

  3. Department of Chemical and Metallurgical Engineering, School of Chemical Engineering, Aalto University, PO Box 16100, 00076, Aalto, Finland

    Xingbang Wan, Min Chen & Pekka Taskinen

  4. Vanadium and Titanium Resources Comprehensive Utilization of State Key Laboratory, 617000, Panzhihua, Sichuan, People’s Republic of China

    Bin Yu

  5. School of Material Science and Engineering, Northeastern University, Shenyang, People’s Republic of China

    Changsheng Liu

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  1. Junjie Shi
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Correspondence to Junjie Shi.

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Shi, J., Qiu, Y., Wan, X. et al. Equilibrium Phase Relations of the CaO-SiO2-Ti3O5 System at 1400 °C and a p(O2) of 10−16 atm. JOM 74, 668–675 (2022). https://doi.org/10.1007/s11837-021-05049-3

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