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<p>The phase equilibria of the SiO<sub>2</sub>–CaO–Al<sub>2</sub>O<sub>3</sub>–TiO<sub><i>x</i></sub> system is crucial in designing recycling processes of precious metal catalysts supported on ceramics. In this study, a high-temperature equilibration-quench technique was used to experimentally determine the homogeneous liquid composition of a SiO<sub>2</sub>–CaO–Al<sub>2</sub>O<sub>3</sub>–TiO<sub><i>x</i></sub> system under a reducing atmosphere with metallic iron at 1623&#xa0;K. The Al<sub>2</sub>O<sub>3</sub>/TiO<sub>2</sub> composition of 1.5 by mass was investigated. The oxygen partial pressure in this study, measured using an oxygen-concentration cell, was approximately <InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11663_2025_3518_Article_IEq1.gif" Format="GIF" Height="17" Rendition="HTML" Resolution="72" Type="Linedraw" Width="48" /> </InlineMediaObject> <EquationSource Format="TEX">\({10}^{-15.8}\)</EquationSource> <EquationSource Format="MATHML"><math> <msup> <mrow> <mn>10</mn> </mrow> <mrow> <mo>-</mo> <mn>15.8</mn> </mrow> </msup> </math></EquationSource> </InlineEquation> to <InlineEquation ID="IEq2"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11663_2025_3518_Article_IEq2.gif" Format="GIF" Height="17" Rendition="HTML" Resolution="72" Type="Linedraw" Width="48" /> </InlineMediaObject> <EquationSource Format="TEX">\({10}^{-13.6}\)</EquationSource> <EquationSource Format="MATHML"><math> <msup> <mrow> <mn>10</mn> </mrow> <mrow> <mo>-</mo> <mn>13.6</mn> </mrow> </msup> </math></EquationSource> </InlineEquation>. The results showed that the sum of Al<sub>2</sub>O<sub>3</sub> and TiO<sub><i>x</i></sub> in the liquid phase reached a maximum value when CaO/SiO<sub>2</sub> was about 1 on a mass basis, indicating that approximately 50&#xa0;mass&#xa0;pct of them were dissolved. The optimum concentrations of SiO<sub>2</sub> and CaO for melting Al<sub>2</sub>O<sub>3</sub>–TiO<sub>2</sub>-based raw materials were determined.</p>

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Phase Equilibria of the SiO2–CaO–Al2O3–TiOx System Coexisting with Solid Fe at 1623 K

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  • 发表日期：

    2025年3月21日

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  • Takashi Murata,
  • Ryuji Otake,
  • Katsunori Yamaguchi

摘要

The phase equilibria of the SiO2–CaO–Al2O3–TiOx system is crucial in designing recycling processes of precious metal catalysts supported on ceramics. In this study, a high-temperature equilibration-quench technique was used to experimentally determine the homogeneous liquid composition of a SiO2–CaO–Al2O3–TiOx system under a reducing atmosphere with metallic iron at 1623 K. The Al2O3/TiO2 composition of 1.5 by mass was investigated. The oxygen partial pressure in this study, measured using an oxygen-concentration cell, was approximately \({10}^{-15.8}\) 10 - 15.8 to \({10}^{-13.6}\) 10 - 13.6 . The results showed that the sum of Al2O3 and TiOx in the liquid phase reached a maximum value when CaO/SiO2 was about 1 on a mass basis, indicating that approximately 50 mass pct of them were dissolved. The optimum concentrations of SiO2 and CaO for melting Al2O3–TiO2-based raw materials were determined.