Experimental Determination of the Phase Diagram of the CaO-SiO sub(2)-5 pctMgO-10 pctAl sub(2)O sub(3)-TiO sub(2) System

• Published in: Metallurgical and materials transactions. B, Process metallurgy and materials processing science Process metallurgy and materials processing science, 2016-02, Vol.47 (1), p.425-433
• Main Authors: Shi, Junjie, Sun, Lifeng, Zhang, Bo, Liu, Xuqiang, Qiu, Jiyu, Wang, Zhaoyun, Jiang, Maofa
• Format: Article
• Language: English
• Subjects: Mathematical analysis; Phase diagrams; Process metallurgy; Scanning electron microscopy; Systems (metallurgical); Thermocouples; Titanium dioxide; X-rays
• ISSN: 1073-5615; 1543-1916
• DOI: 10.1007/s11663-015-0527-3

Ti-bearing CaO-SiO sub(2)-MgO-Al sub(2)O sub(3)-TiO sub(2) slags are important for the smelting of vanadium-titanium bearing magnetite. In the current study, the pseudo-melting temperatures were determined by the single-hot thermocouple technique for the specified content of 5 to 25 pct TiO sub(2) in the CaO-SiO sub(2)-5 pctMgO-10 pctAl sub(2)O sub(3)-TiO sub(2) phase diagram system. The 1573 K to 1773 K (1300 degree C to 1500 degree C) liquidus lines were first calculated based on the pseudo-melting temperatures according to thermodynamic equations in the specific primary crystal field. The phase equilibria at 1573 K (1300 degree C) were determined experimentally using the high-temperature equilibrium and quench method followed by X-ray fluorescence, X-ray diffraction, scanning electron microscope, and energy dispersive X-ray spectroscope analysis; the liquid phase, melilite solid solution phase (C sub(2)MS sub(2),C sub(2)AS) sub(ss), and perovskite phase of CaO.TiO sub(2) were found. Therefore, the phase diagram was constructed for the specified region of the CaO-SiO sub(2)-5 pctMgO-10 pctAl sub(2)O sub(3)-TiO sub(2) system.