Laboratory assessment of isothermal separation of V containing spinel phase from vanadium slag by centrifugal casting

V containing spinel phase was successfully separated from vanadium slag by centrifugal casting. With the process parameters of G = 900 (where normal gravity G = 1), t = 20 min and T = 1557 K, almost all V containing spinel phase is enriched in the concentrate, while the tailing is made up of Fe2SiO4, Fe2TiO4 and Mn2VO4 phases. Under the hypothesis that the vanadium and silicon exist in the slag as V2O3 and SiO2, the mass fractions of V2O3 and SiO2 in the concentrate are 25·2 and 2·2%, while those of the tailing are 0·8 and 32·2% respectively. The recovery ratio of V in the concentrate is up to 97·4%, while the removal ratio of Si is 92·5% by centrifugal separation.