Abstract
We investigated the phase relations of the SiO2-MgO-TiO2 system in air at 1500°C using the high-temperature isothermal equilibration/quenching technique, followed by x-ray diffraction measurements and direct phase analysis using scanning electron microscopy coupled with x-ray energy dispersive spectrometry. One single liquid phase domain, five two-phase domains (liquid-TiO2, liquid-cristobalite, liquid-MgO·SiO2, liquid-2MgO·SiO2, and liquid-MgO·2TiO2), and five three-phase regions (liquid-TiO2-MgO·2TiO2, liquid-MgO·SiO2-cristobalite, liquid-TiO2-cristobalite, liquid-MgO·SiO2-2MgO·SiO2 and liquid-2MgO·SiO2-MgO·2TiO2) were observed. We constructed a 1500°C isothermal phase diagram based on the experimentally measured liquid compositions. We compared simulations using MTDATA and FactSage thermodynamic software and their databases with the experimental results obtained in this study. These results can be used to provide guidelines for updating the MTDATA and FactSage titania-bearing thermodynamic databases by reassessing the thermodynamic properties of the phase with new experimental data.
Highlights
The phase equilibria of the SiO2-MgO-TiO2 system were investigated at 1500°C in air using the high-temperature isothermal equilibration/quenching/SEM-EDS/XRD analysis technique
We determined the isotherms for the cristobalite, MgOÆSiO2, 2MgOÆSiO2, MgOÆ2TiO2, and TiO2 primary phase field
We compared the present results with the available data from the literature and with simulations by FactSage and MTDATA
Summary
With the steady growth in the generation of blast furnace slags from vanadium-titanium magnetite ores, the recovery of titania from industrial titaniabearing slags containing 22–25 wt.% TiO21–3 is attracting increasing attention.[3,4,5,6,7,8,9,10,11,12,13,14,15] Over the past decades, both hydrometallurgical and pyrometallurgical methods[15,16,17,18,19,20,21,22,23,24] for processing titania-bearing slags have been applied and investigated intensively. The formation of titania-rich minerals can be estimated and their fractions evaluated using the phase equilibrium information of the system Based on their composition, industrial titaniabearing slags[1,21,28] conform to the Al2O3-CaO-SiO2MgO-TiO2-Ti2O3 system.[29] The phase relations of the Al2O3-CaO-SiO2-MgO-TiO2 system have been intensively investigated under varying conditions[27,29,30,31,32,33,34,35,36,37,38,39,40,41,42] by using different thermodynamic modeling tools and experimental methods. They constructed isotherms for the rutile and perovskite primary phase fields.[43,44] Chen, Wan, Shi, Taskinen, and Jokilaakso
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
