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<p>To address the low vanadium (V) recovery rate in the direct alloying process with V<sub>2</sub>O<sub>5</sub> during the smelting of V-alloyed steel, this study proposes employing a CaO–Al<sub>2</sub>O<sub>3</sub>–VO<sub><i>x</i></sub> slag system as the refining slag. The strategy aims to enhance V recovery by reducing the activity of V<sub>2</sub>O<sub>5</sub> and moderately increasing slag viscosity to inhibit V<sub>2</sub>O<sub>5</sub> volatilization, which exhibits significant potential for industrial application. The phase equilibrium behavior and V valence state distribution in this slag system were systematically investigated at 1600&#xa0;°C under an argon atmosphere using a static equilibrium method combined with electron probe micro-analysis, scanning electron microscope-energy dispersive spectrometer, and X-ray photoelectron spectroscopy techniques. Experimental results indicate the presence of two types of three-phase coexistence regions, four types of two-phase coexistence regions, and an extensive liquid-phase region. V in the liquid phase predominantly exists as V<sup>5+</sup>, with an average O/V ratio of 2.381. A three-dimensional phase diagram of CaO–Al<sub>2</sub>O<sub>3</sub>–VO<sub>2</sub>–V<sub>2</sub>O<sub>5</sub> was constructed to clarify the evolution of phase equilibria under low oxygen partial pressure. For practical production guidance, the phase equilibria were approximated through projection, and a quantitative evaluation of the projection accuracy was performed.</p>

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Phase Equilibrium Study of CaO–Al2O3–VOx Slag System Under Argon Atmosphere at 1600 °C

  • 期刊论文

  • 发表日期：

    2025年11月24日

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

摘要

To address the low vanadium (V) recovery rate in the direct alloying process with V2O5 during the smelting of V-alloyed steel, this study proposes employing a CaO–Al2O3–VOx slag system as the refining slag. The strategy aims to enhance V recovery by reducing the activity of V2O5 and moderately increasing slag viscosity to inhibit V2O5 volatilization, which exhibits significant potential for industrial application. The phase equilibrium behavior and V valence state distribution in this slag system were systematically investigated at 1600 °C under an argon atmosphere using a static equilibrium method combined with electron probe micro-analysis, scanning electron microscope-energy dispersive spectrometer, and X-ray photoelectron spectroscopy techniques. Experimental results indicate the presence of two types of three-phase coexistence regions, four types of two-phase coexistence regions, and an extensive liquid-phase region. V in the liquid phase predominantly exists as V5+, with an average O/V ratio of 2.381. A three-dimensional phase diagram of CaO–Al2O3–VO2–V2O5 was constructed to clarify the evolution of phase equilibria under low oxygen partial pressure. For practical production guidance, the phase equilibria were approximated through projection, and a quantitative evaluation of the projection accuracy was performed.