Element Migration Behaviors During the Reduction of Vanadium Slag for Iron‐Removal and Vanadium‐Enrichment

The lengthy production procedures of FeV alloy from vanadium slag (VS) presently may cause high production costs and hazardous leaching liquor waste containing toxic V 5+ and Cr 6+ ions. A two‐step direct reduction technology is considered a short and environmental‐friendly process to solve the aforementioned problems. Solar grade silicon cutting slurry waste (SoG‐Si w ) containing Si and SiC is regarded as an effective reductant to achieve comprehensive resource utilization and control reductant cost. The element migration behaviors during the reduction process are clarified from phase transitions and microcosmic features. The results showed that 78.7 wt% of Fe and 38.6 wt% of Cr migrated from slag to the metal phase with a mass ratio of pretreated SoG‐Si w (Si‐SiC mixt ) to VS (S/V) of 0.15 after soaking at 1823 K for 60 min. The content of V 2 O 3 is enriched from 12.14 to 16.13 wt%. The mass ratio of V to Fe increased from 0.28 to 1.40, satisfying the composition goal of the production of FeV60 alloy (50–65 wt% V). With an increase of S/V to 0.20, 4.6 wt% of V migrated from slag to the metal phase, causing the loss of vanadium. The reduction path is FeO → Fe 2 TiO 4 → (Mn, Fe)(V, Cr) 2 O 4 → (V, Cr) 2 O 3 .