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<p>The phase diagram of the CaO–Al<sub>2</sub>O<sub>3</sub>–La<sub>2</sub>O<sub>3</sub>–MgO slag system holds significant theoretical implications for guiding both the design of refining slags in rare earth-treated steel production and the modification of high-melting-point rare earth inclusions. In this study, the phase equilibria within a partial composition range of CaO–Al<sub>2</sub>O<sub>3</sub>–La<sub>2</sub>O<sub>3</sub>–MgO quaternary system were experimentally determined at 1773 K using the high-temperature equilibrium and quenching method. The types and compositions of equilibrium phases were identified by Scanning Electron Microscopy (SEM), Electron Probe Micro-Analysis (EPMA), and X-Ray Diffraction (XRD). On this basis, an isothermal tetrahedral quaternary phase diagram at 1773 K and its several pseudo-ternary sections with constant <i>w</i>(MgO) were constructed. We have identified a total of 2 four-phase fields (<i>i.e.</i>, Liquid+2CaO·Al<sub>2</sub>O<sub>3</sub>·La<sub>2</sub>O<sub>3</sub>+CaO+MgO, Liquid+2CaO·Al<sub>2</sub>O<sub>3</sub>·La<sub>2</sub>O<sub>3</sub>+Al<sub>2</sub>O<sub>3</sub>·La<sub>2</sub>O<sub>3</sub>+MgO), 5 three-phase fields (<i>i.e.</i>, Liquid+3CaO·Al<sub>2</sub>O<sub>3</sub>+CaO, Liquid+CaO+MgO, Liquid+2CaO·Al<sub>2</sub>O<sub>3</sub>·La<sub>2</sub>O<sub>3</sub>+CaO, Liquid+2CaO·Al<sub>2</sub>O<sub>3</sub>·La<sub>2</sub>O<sub>3</sub>+Al<sub>2</sub>O<sub>3</sub>·La<sub>2</sub>O<sub>3</sub>, Liquid+Al<sub>2</sub>O<sub>3</sub>·La<sub>2</sub>O<sub>3</sub>+MgO), and 4 two-phase fields (<i>i.e.</i>, Liquid+3CaO·Al<sub>2</sub>O<sub>3</sub>, Liquid+CaO, Liquid+Al<sub>2</sub>O<sub>3</sub>·La<sub>2</sub>O<sub>3</sub>, Liquid+MgO).</p>

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Phase Diagram of CaO–Al2O3–La2O3–MgO quaternary system at 1773 K within high w(CaO)/w(Al2O3)

  • 期刊论文

  • 发表日期：

    2025年11月4日

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  • Changhao Song,
  • Jiyu Qiu,
  • Chengjun Liu,
  • Guojie Huo

摘要

The phase diagram of the CaO–Al2O3–La2O3–MgO slag system holds significant theoretical implications for guiding both the design of refining slags in rare earth-treated steel production and the modification of high-melting-point rare earth inclusions. In this study, the phase equilibria within a partial composition range of CaO–Al2O3–La2O3–MgO quaternary system were experimentally determined at 1773 K using the high-temperature equilibrium and quenching method. The types and compositions of equilibrium phases were identified by Scanning Electron Microscopy (SEM), Electron Probe Micro-Analysis (EPMA), and X-Ray Diffraction (XRD). On this basis, an isothermal tetrahedral quaternary phase diagram at 1773 K and its several pseudo-ternary sections with constant w(MgO) were constructed. We have identified a total of 2 four-phase fields (i.e., Liquid+2CaO·Al2O3·La2O3+CaO+MgO, Liquid+2CaO·Al2O3·La2O3+Al2O3·La2O3+MgO), 5 three-phase fields (i.e., Liquid+3CaO·Al2O3+CaO, Liquid+CaO+MgO, Liquid+2CaO·Al2O3·La2O3+CaO, Liquid+2CaO·Al2O3·La2O3+Al2O3·La2O3, Liquid+Al2O3·La2O3+MgO), and 4 two-phase fields (i.e., Liquid+3CaO·Al2O3, Liquid+CaO, Liquid+Al2O3·La2O3, Liquid+MgO).