FeO and V2O5 are two main components of the obtained vanadium steel slag, and the reaction of FeO-V2 05 s3~stem determines the physical property of the slag. Through thermodynamic calculation and experimental study, it can be found that within the ranges of steel-making temperature, V2O5 is reduced to VO2. As FeO exists in FeO- V2O5 system, VO2 will be reduced to V2 03 further while FeO is oxidized to Fe2O3. In this multi-system, as the content of FeO and temperature increase, the system will have products in turn such as V2O5, V2O4, FeVO4, Fe2 VO4 and Fe304. The products are mainly V3O5 and Fe203 when the content of FeO is 0.58 tool and the temperature is 1 100 K, and as the temperature increases, V2O5 starts to react with V3O5 and then generates FeVO4 ; FeVO4 disappears while the content of FeO and the temperature increase at the same time, and then Fe2 VO4 is generated by the reaction of FeO, Fe2O3 and V2O5. Iron oxides are also generated such as Fe3O4 and so on.
