About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advances in Recycling and Environmental Technologies
|
| Presentation Title |
Phase Evolution of Iron-Vanadium Spinels in Vanadium-Bearing Slags During Roasting |
| Author(s) |
Jianqi Cao, Xingyue Ma, Wanlin Wang, Yongqi Sun |
| On-Site Speaker (Planned) |
Yongqi Sun |
| Abstract Scope |
Vanadium plays a critical role in enhancing material properties across metallurgical, energy, and aerospace applications. Minor elements affect the stability of iron-vanadium spinels upon roasting, involving the destruction of iron-vanadium spinels and the formation of soluble vanadate. In this study, the phase evolution of iron-vanadium spinels and the roles of minor elements upon calcium roasting were investigated systematically by thermodynamic calculations. The results showed that the iron-vanadium spinel underwent a phase transition to form two main distinct phases, namely a Ca2V2O7 and a M2O3 solid solution, with an extremely small amount of Ca3V2O8 formed. A higher roasting temperature over 850 °C effectively inhibited the formation of CaCrO4 in the presence of Cr2O3. Conversely, a lower roasting temperature less than 850 °C prevented the formations of slag-liquid phase and CaTiO3 in the presence of TiO2. These findings provided a guidance for destroying iron-vanadium spinels’ structures for vanadium extraction from vanadium-bearing slags. |
| Proceedings Inclusion? |
Undecided |
| Keywords |
Phase Transformations, Pyrometallurgy, Recycling and Secondary Recovery |