Separation of Vanadium and Titanium Phase from the Vanadium Slag System Utilizing Supergravity

To effectively recycle and utilize vanadium and titanium resource from the vanadium slag, the crystallization and separation behaviors of V-spinel phase and Ti-spinel phase in the FeO–SiO2–V2O3–TiO2 system as the main components of vanadium slag were investigated. The results indicated that the suitable temperatures for precipitating V-spinel phase and Ti-spinel phase were chosen as 1723 K and 1623 K, respectively. With introduction supergravity at the parameter of G = 700, T = 1723 K and t = 10 minutes, the solid V-containing phase was intercepted by the filter to form the V-enriched slag, while the residual melt went through the filter into the lower crucible to form the Ti-containing slag. And the mass fraction of V2O3 in the V-enriched slag reached about 32.98 wt% and that of TiO2 in the Ti-containing slag reached about 19.41 wt%; the recovery ratios of V2O3 and TiO2 were about 86.50% and 76.80%, respectively. In addition, the Ti-spinel phase was further separated and concentrated in the Ti-enriched slag from the Ti-containing slag with the gravity coefficient G = 500 at 1623 K for 10 minutes. The mass fraction and the recovery ratio of TiO2 in the Ti-enriched slag could reach 30.83 wt% and 89.80%, respectively. In the whole process, the comprehensive recovery ratio of TiO2 could reach 68.97%.