Phase equilibria relations in the V2O5-rich part of the Fe2O3-TiO2-V2O5 system at 1200°C related to converter vanadium-bearing slag

• Published in: International journal of minerals, metallurgy and materials metallurgy and materials, 2024-09, Vol.31 (9), p.2017-2024
• Main Authors: Shi, Junjie, Zhai, Yumo, Qiu, Yuchao, Hou, Changle, Dong, Jingjing, Yao, Maoxi, Li, Haolun, Zhou, Yongrong, Li, Jianzhong
• Format: Article
• Language: English
• Subjects: Ceramics; Characterization and Evaluation of Materials; Chemistry and Materials Science; Circular economy; Composites; Corrosion and Coatings; Energy consumption; Equilibrium; Experiments; Glass; Heat resistance; High temperature; Liquid phases; Materials Science; Metallic Materials; Metallurgy; Natural Materials; Phase equilibria; Photoelectrons; Research Article; Rutile; Slag; Sodium; Solid solutions; Steel converters; Steel production; Surfaces and Interfaces; Sustainable development; Temperature; Thermodynamics; Thin Films; Titanium dioxide; Tribology; Vanadium; Vanadium pentoxide; Vanadium pentoxide-Titanium dioxide; X ray photoelectron spectroscopy; X ray spectrometers
• ISSN: 1674-4799; 1869-103X
• DOI: 10.1007/s12613-024-2845-4

The efficient recycling of vanadium from converter vanadium-bearing slag is highly significant for sustainable development and circular economy. The key to developing novel processes and improving traditional routes lies in the thermodynamic data. In this study, the equilibrium phase relations for the Fe 2 O 3 -TiO 2 -V 2 O 5 system at 1200°C in air were investigated using a high-temperature equilibrium-quenching technique, followed by analysis using scanning electron microscopy-energy dispersive X-ray spectrometer and X-ray photoelectron spectroscopy. One liquid-phase region, two two-phase regions (liquid-rutile and liquid-ferropseudobrookite), and one three-phase region (liquid-rutile-ferropseudobrookite) were determined. The variation in the TiO 2 and V 2 O 5 contents with the Fe 2 O 3 content was examined for rutile and ferropseudobrookite solid solutions. However, on further comparison with the predictions of FactSage 8.1, significant discrepancies were identified, highlighting that greater attention must be paid to updating the current thermodynamic database related to vanadium-bearing slag systems.