Abstract
AbstractThe 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.
Highlights
Steel slag is a by-product of steelmaking industry
Since the domestic steel slag comprehensive utilization level is lower than the developed countries [3,4], the yield of Chinese crude steel is huge, still a large amount of steel slag is untreated and only stockpiled for disposal [5]
Some steel slags such as stainless steel slag, electric arc furnace steel slag, and chromium-containing hot metal steelmaking slag contain a certain amount of chromium oxides
Summary
Steel slag is a by-product of steelmaking industry. In the steelmaking process, the amount of steel slag is about. Since the domestic steel slag comprehensive utilization level is lower than the developed countries [3,4], the yield of Chinese crude steel is huge, still a large amount of steel slag is untreated and only stockpiled for disposal [5] Some steel slags such as stainless steel slag, electric arc furnace steel slag, and chromium-containing hot metal steelmaking slag contain a certain amount of chromium oxides. It is possible that part of the chromium may exist in the form of toxic hexavalent chromium Cr(VI) in steel slag. The chromium oxides can be expressed as CrOx. study on the valence state of chromium in the metallurgical slag and its influencing factors has a very important significance for the clarification of the existing forms of chromium-containing phases and prevention of the pollution of toxic hexavalent chromium. 7.05 expect to provide a theoretical reference for reducing the −4 toxic hexavalent chromium
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