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Equilibrium Phase Relationships of CaO-SiO2-TiO2 System with 5 wt% Cr2O3 Addition for Titania-Bearing Slag Recycling

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Abstract

It has been proved that Cr2O3 is favorable to promote the crystallization of perovskite in the Selective Crystallization and Phase Separation (SCPS) process. However, the related thermodynamic data of equilibrium phase relations was quite limited. In the present work, the equilibrium phase relations of CaO-SiO2-TiO2 system with the addition of 5 wt% Cr2O3 were experimentally carried out using the high temperature equilibration-quenching technique followed by X-Ray Diffraction (XRD), Scanning Electron Microscopy-Energy Dispersive X-Ray Spectroscopy (SEM–EDS), as well as thermodynamic calculation. More attention has been focused on the influence of 5 wt% Cr2O3 addition on the liquid-perovskite two-phase coexisting region. The results indicated that the crystallization of perovskite was promoted by Cr2O3 addition by expanding the primary phase of perovskite toward higher SiO2 areas. Meanwhile, distinct discrepancies were found when the present experimental results were compared with the data from the literature and the isotherms calculated by FactSage, indicating that the present results are not only meaningful for the improvement of the SCPS process, but also important for the optimization of titania related oxide thermodynamic database.

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Funding

This study received financial support from Key Laboratory Open Project Fund of Metallurgical Emission Reduction and Resources Recycling (Anhui University of Technology), Ministry of Education (JKF22-02), National Natural Science Foundation of China (No. 52204310), China Postdoctoral Science Foundation (Grant number 2020TQ0059, 2020M570967). The Natural Science Foundation of Liaoning Province (2021-MS-083). The Fundamental Research Funds for the Central Universities (N2125010), Key Laboratory for Anisotropy and Texture of Materials, Ministry of Education, National Natural Science Foundation of China (52074004).

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Authors and Affiliations

  1. Key Laboratory of Metallurgical Emission Reduction & Resources Recycling, Ministry of Education, Anhui University of Technology, Ma’anshan, 243002, Anhui, China

    Ningning Lv, Yiming Hu & Xiang Ding

  2. School of Metallurgical Engineering, Anhui University of Technology, Ma’anshan, 243002, Anhui, China

    Ningning Lv, Yiming Hu & Xiang Ding

  3. Key Laboratory for Ecological Metallurgy of Multimetallic Mineral, Ministry of Education, Northeastern University, Shenyang, 110819, China

    Yuchao Qiu, Hangkai Shi, Junjie Shi & Haolun Li

  4. School of Metallurgy, Northeastern University, Shenyang, 110819, China

    Yuchao Qiu, Hangkai Shi, Junjie Shi & Haolun Li

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  1. Ningning Lv
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Correspondence to Junjie Shi or Xiang Ding.

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Lv, N., Qiu, Y., Hu, Y. et al. Equilibrium Phase Relationships of CaO-SiO2-TiO2 System with 5 wt% Cr2O3 Addition for Titania-Bearing Slag Recycling. J. Sustain. Metall. 9, 1303–1314 (2023). https://doi.org/10.1007/s40831-023-00723-z

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