Experimental Determination of the Phase Diagram of the CaO-SiO2-5 pctMgO-10 pctAl^sub 2^O3-TiO2 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
• Main Authors: Shi, Junjie, Sun, Lifeng, Zhang, Bo, Liu, Xuqiang, Qiu, Jiyu, Wang, Zhaoyun, Jiang, Maofa
• Format: Article
• Language: English
• Subjects: Melting; Metallurgy; Slag; Thermodynamics
• ISSN: 1073-5615; 1543-1916
• DOI: 10.1007/s11663-015-0527-3

Ti-bearing CaO-SiO2-MgO-Al^sub 2^O3-TiO2 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 TiO2 in the CaO-SiO2-5 pctMgO-10 pctAl^sub 2^O3-TiO2 phase diagram system. The 1573 K to 1773 K (1300 °C to 1500 °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 °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·TiO2 were found. Therefore, the phase diagram was constructed for the specified region of the CaO-SiO2-5 pctMgO-10 pctAl^sub 2^O3-TiO2 system.