About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advances in Recycling and Environmental Technologies
|
| Presentation Title |
Phase and Composition Evolutions of Iron-Vanadium Spinels in Vanadium-Bearing Slags During Roasting |
| Author(s) |
Jianqi Cao, 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. This study systematically investigated the phase transformation mechanisms of iron-vanadium spinels and the roles of minor elements upon calcium roasting. The results showed that the evolution of iron-vanadium spinels followed a three-step mechanism: initial oxidative decomposition, subsequent formation of CaV2O6, and final conversion to Ca2V2O7. The presence of Cr2O3, MnO and MgO did not produce new phases, but TiO2 and Al2O3 did. Moreover, a higher roasting temperature enhanced the partitioning of TiO2, Al2O3, and Cr2O3 from the vanadium-enriched phase and a lower roasting temperature promoted the formation of manganese and magnesium vanadates. These findings offer a guidance for optimizing the roasting conditions for destroying iron-vanadium spinels’ structures for vanadium extraction from vanadium-bearing slags. |
| Proceedings Inclusion? |
Undecided |
| Keywords |
Phase Transformations, Pyrometallurgy, Recycling and Secondary Recovery |