Regular Article

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

¹ College of Materials Science and Engineering, Chongqing University, Chongqing 400044, PR China
² Chongqing Key Laboratory of Vanadium-Titanium Metallurgy and Advanced Materials, Chongqing 400044, PR China

^* diaojiang@163.com

Received: 27 April 2018
Accepted: 12 July 2018

Abstract

The valence states of vanadium and chromium in FeO-SiO₂-MnO-TiO₂-VO_x-MgO-CrO_x 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.