Abstract The chromium valence states in the CaO–SiO2–FeO–MgO–CrOx system were investigated by X-ray photoelectron spectroscopy (XPS). The results indicated that the XPS peaks of Cr 2p3/2 and Cr 2p1/2 locate at the binding energy of ∼577 and ∼586 eV, respectively. There are three kinds of chromium ions such as bivalent Cr(ii), trivalent Cr(iii), and hexavalent Cr(vi) in the CaO–SiO2–FeO–MgO–CrOx slag. Cr(iii) is the dominant valence state, and more than 77.99% Cr is trivalent Cr(iii). The fraction of Cr(ii)/Cr is in the range of 11.24–17.22%. The fraction of Cr(vi)/Cr is below 4.80%. The fraction of Cr(ii)/Cr decreases with increasing slag basicity, Cr2O3 content, temperature, or oxygen pressure log(PO2), while the fraction of Cr(iii)/Cr increases with increasing basicity, Cr2O3 content, temperature, or oxygen pressure. The trend of change is opposite. Low log(PO2), high Cr2O3 content, and high temperature are beneficial to reduce the toxic hexavalent Cr(vi). The slag basicity has little influence on the fraction of Cr(vi)/Cr.

中文翻译：

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X射线光电子能谱法测定CaO-SiO2-FeO-MgO-CrOx体系中的铬价态

摘要 通过 X 射线光电子能谱 (XPS) 研究了 CaO-SiO2-FeO-MgO-CrOx 体系中的铬价态。结果表明，Cr 2p3/2 和Cr 2p1/2 的XPS 峰分别位于~577 和~586 eV 的结合能处。CaO-SiO2-FeO-MgO-CrOx 渣中存在三价铬离子，如二价 Cr(ii)、三价 Cr(iii) 和六价 Cr(vi)。Cr(iii) 是主要的价态，超过 77.99% 的 Cr 是三价 Cr(iii)。Cr(ii)/Cr 的分数在 11.24-17.22% 的范围内。Cr(vi)/Cr 的分数低于 4.80%。Cr(ii)/Cr 的分数随着渣碱度、Cr2O3 含量、温度或氧气压力 log(PO2) 的增加而减少，而 Cr(iii)/Cr 的分数随着碱度、Cr2O3 含量、温度或氧气的增加而增加压力。变化的趋势是相反的。低 log(PO2)、高 Cr2O3 含量和高温有利于减少有毒的六价 Cr(vi)。渣碱度对Cr(vi)/Cr的分数影响不大。