Effect of Na2O addition on the partition of vanadium, niobium, manganese and titanium between CaO-CaF2-SiO2 melts and carbon saturated iron.
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The effect of Na2O additions to the CaO-CaF2-SiO2 system on the partition of vanadium, niobium, manganese and titanium between CaO- CaF2-SiO2 melts doubly saturated with CaO and 3CaO•SiO2 and molten carbon saturated iron was investigated at 1300°C. The partition of vanadium, niobium and titanium increased with increasing content of Na2O. On the other hand the manganese partition decreased, indicating that manganese oxide behaves as a basic oxide in the CaO-Na2O-CaF2-SiO2 system.Since the vanadium, niobium and titanium have various valencies in ionic melts of slag, the ionic species of these three elements were determined. Each element was shown to exist in slag mainly as Nb5+, V4+ and Ti4+, respectively.Addition of a small amount of Na2O to the CaO-CaF2-SiO2 system enhances the capacity of removing niobium, vanadium and titanium from hot metal to slag. It was proved that the yield of manganese increases and the recovery of niobium, vanadium and titanium to slag increases by addition of Na2O to CaO-CaF2-SiO2 flux for hot metal treatment.Vanadium, niobium, manganese and titanium capacities were calculated and the relationships between these capacities and carbonate and phosphate capacities are discussed.
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The Iron and Steel Institute of Japan | 論文
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