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<p>Phase relationships of the Mn<sub>3</sub>O<sub>4</sub>–SiO<sub>2</sub>–CaO(–Al<sub>2</sub>O<sub>3</sub>) system were determined experimentally at 1573&#xa0;K and 1673&#xa0;K in air using a high-temperature equilibration and quenching method due to its wide application in the fields of catalysis, energy, environment, and metallurgy. Tridymite, pseudowollastonite, calcium silicate, and hausmannite were confirmed to coexist with the liquid oxide in the Mn<sub>3</sub>O<sub>4</sub>–SiO<sub>2</sub>–CaO system. Three two-phase domains (liquid-tridymite, liquid-mullite, and liquid-cubic spinel) and three three-phase regions (liquid-tridymite-mullite, liquid-mullite-corundum, and liquid-corundum-cubic spinel) were observed in the Mn<sub>3</sub>O<sub>4</sub>–SiO<sub>2</sub>–Al<sub>2</sub>O<sub>3</sub> system. The 1573&#xa0;K and 1673&#xa0;K isotherms of the Mn<sub>3</sub>O<sub>4</sub>–SiO<sub>2</sub>–CaO(–Al<sub>2</sub>O<sub>3</sub>) system were constructed based on the experimental results. The tridymite primary phase fields were consistent with the predictions in the Mn<sub>3</sub>O<sub>4</sub>–SiO<sub>2</sub>–CaO(–Al<sub>2</sub>O<sub>3</sub>) system. However, significant discrepancies were still observed between experimental results and software calculations in the high Mn<sub>3</sub>O<sub>4</sub> content region. Therefore, the thermodynamic databases of the manganese oxide-containing system still need to be updated, especially in the oxidation atmosphere.</p>

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Phase Equilibria of the Mn3O4–SiO2–CaO(–Al2O3) System in Air at 1573 K and 1673 K

  • 期刊论文

  • 发表日期：

    2025年1月27日

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  • Yuxuan Zeng,
  • Mengjie Ran,
  • Songwen Xiao,
  • Zhihong Liu,
  • Guoxing Ren

摘要

Phase relationships of the Mn3O4–SiO2–CaO(–Al2O3) system were determined experimentally at 1573 K and 1673 K in air using a high-temperature equilibration and quenching method due to its wide application in the fields of catalysis, energy, environment, and metallurgy. Tridymite, pseudowollastonite, calcium silicate, and hausmannite were confirmed to coexist with the liquid oxide in the Mn3O4–SiO2–CaO system. Three two-phase domains (liquid-tridymite, liquid-mullite, and liquid-cubic spinel) and three three-phase regions (liquid-tridymite-mullite, liquid-mullite-corundum, and liquid-corundum-cubic spinel) were observed in the Mn3O4–SiO2–Al2O3 system. The 1573 K and 1673 K isotherms of the Mn3O4–SiO2–CaO(–Al2O3) system were constructed based on the experimental results. The tridymite primary phase fields were consistent with the predictions in the Mn3O4–SiO2–CaO(–Al2O3) system. However, significant discrepancies were still observed between experimental results and software calculations in the high Mn3O4 content region. Therefore, the thermodynamic databases of the manganese oxide-containing system still need to be updated, especially in the oxidation atmosphere.