Abstract
Ti-bearing CaO-SiO2-MgO-Al2O3-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 pctAl2O3-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 (C2MS2,C2AS)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 pctAl2O3-TiO2 system.
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Acknowledgments
This work was financially supported by the National Natural Science Foundation of China (Nos. 51104039 and 51304042), Scientific Research Fund of Liaoning Provincial Education Department (No. L2013114), Programs of Liaoning province for Science and Technology Development (No. 2012221013), and the Fundamental Research Funds for the Central Universities of China (N130602002).
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Manuscript submitted May 06, 2015.
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Shi, J., Sun, L., Zhang, B. et al. Experimental Determination of the Phase Diagram of the CaO-SiO2-5 pctMgO-10 pctAl2O3-TiO2 System. Metall Mater Trans B 47, 425–433 (2016). https://doi.org/10.1007/s11663-015-0527-3
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DOI: https://doi.org/10.1007/s11663-015-0527-3