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2011-Sustainable Industrial Processing Summit
|Flogen Star OUTREACH
|2291-1227 (Metals and Materials Processing in a Clean Environment Series)
Electric arc furnace (EAF) dust from stainless steel plant has been considered as a toxic solid waste due to its significant levels of toxic substances, such as Cr(VI). In this paper, X-ray photoelectron spectroscopy (XPS) was employed to determine the elemental distribution profiles of Cr (VI) species. The XPS elemental survey showed that the elements that exist on the surface of the Electric arc furnace (EAF) dust from stainless steel plant are C, O, F, Si, Fe, Zn, Cr, Ca and Cl. The F concentration in the surface layers is higher than its bulk composition of the dust, while Cr content is lower in the surface than that in the bulk. The detailed scanning results showed that major compounds detected by XPS are SiO2，ZnO，Fe2O3，CaO，FeCl3，FeF3，Cr2O3，CrO3 or CrCl3. In addition, the Cr(VI) species exist in the form of CrO42- and Cr2O72-. After sputtering about 305s with Ar+ ions, the Cr(VI) species on the surface of the EAF dust disappears. This possibly indicates that the Cr(VI) mainly exist on the surface of dust, and therefore demonstrates that the Cr(VI) species could not form in the furnace but mainly form in the off-gas duct.