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Analysis of V and Cr with various valence states in FeO-SiO2-MnO-TiO2-VOx-MgO-CrOx system by XPS method

The valence states of vanadium and chromium in FeO-SiO2-MnO-TiO2-VOx-MgO-CrOx system were investigated by X-ray photoelectron spectroscopy (XPS). The results indicate that Cr(III) and V(III) are the dominant valence states in this slag system. The fractions of Cr(III) and V(III) are more than 93% and 92% respectively. The fractions of Cr(II) and V(IV) are in the range of 3% ∼ 6%. The fractions of Cr(VI) and V(V) are below 0.9% and 1.9% respectively. Oxygen potential Log(PO2) has great influence on the valence states of Cr and V. Cr2O3 content has little influence on the valence state of V. Similarly, V2O3 content has little influence on the valence state of Cr. The contents of toxic hexavalent Cr(VI) and pentavalent V(V) can be reduced by decreasing Log(PO2) or decreasing Cr2O3 content and V2O3 content.