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<p>The thermodynamic database for the CaO–Al<sub>2</sub>O<sub>3</sub>–VO<sub><i>x</i></sub> system can quantitatively guide the design of vanadium (V) extraction slag systems in the converter. As a critical foundation for establishing thermodynamic database, the determination of phase diagram is essential. This study investigates the phase equilibrium of the CaO–Al<sub>2</sub>O<sub>3</sub>–VO<sub><i>x</i></sub> system under air atmosphere at 1400&#xa0;°C. Through high-temperature phase equilibrium experiments, combined with scanning electron microscope-energy dispersive spectrometer (SEM-EDS) and X-ray photoelectron spectroscopy (XPS), the types of phase equilibria, equilibrium phase compositions, and the content of V in different oxidation states within the liquid phase were identified. The results indicate that under the experimental conditions, the CaO–Al<sub>2</sub>O<sub>3</sub>–VO<sub><i>x</i></sub> system comprises 4 three-phase regions, 6 two-phase regions, and one single-phase region. Furthermore, the phase equilibria were represented in the CaO–Al<sub>2</sub>O<sub>3</sub>–V<sub>2</sub>O<sub>5</sub>–VO<sub>2</sub> quaternary system and projected onto the CaO–Al<sub>2</sub>O<sub>3</sub>–V<sub>2</sub>O<sub>5</sub> and CaO–Al<sub>2</sub>O<sub>3</sub>–VO<sub>2</sub> planes. Additionally, a quantitative assessment of the validity of the projections was conducted by comparing the O/V ratios of V oxides in the liquid phase with those in the projection planes.</p>

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Phase Equilibrium of CaO–Al2O3–VOx System in Air Atmosphere at 1400 °C

  • 期刊论文

  • 发表日期：

    2025年4月8日

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  • Xiaoxiang Xie,
  • Chengjun Liu,
  • Jiyu Qiu,
  • Wenjie Li,
  • Guojie Huo

摘要

The thermodynamic database for the CaO–Al2O3–VOx system can quantitatively guide the design of vanadium (V) extraction slag systems in the converter. As a critical foundation for establishing thermodynamic database, the determination of phase diagram is essential. This study investigates the phase equilibrium of the CaO–Al2O3–VOx system under air atmosphere at 1400 °C. Through high-temperature phase equilibrium experiments, combined with scanning electron microscope-energy dispersive spectrometer (SEM-EDS) and X-ray photoelectron spectroscopy (XPS), the types of phase equilibria, equilibrium phase compositions, and the content of V in different oxidation states within the liquid phase were identified. The results indicate that under the experimental conditions, the CaO–Al2O3–VOx system comprises 4 three-phase regions, 6 two-phase regions, and one single-phase region. Furthermore, the phase equilibria were represented in the CaO–Al2O3–V2O5–VO2 quaternary system and projected onto the CaO–Al2O3–V2O5 and CaO–Al2O3–VO2 planes. Additionally, a quantitative assessment of the validity of the projections was conducted by comparing the O/V ratios of V oxides in the liquid phase with those in the projection planes.