Investigation of Ferrochromium Wastes for their Hazardous Hexavalent Chromium Content

In this study, ferrochromium slag (FS) and electric-arc furnace dust (EAFD) samples were examined for their hazardous hexavalent chromium content mainly by X-ray photoelectron spectroscopy (XPS) analysis. According to the experimental results, magnesium-silicate constitutes main framework of both FS EAFD samples. Highly crystalline contains 3.11%Cr2O3 as spinel phases while constituent is much higher, 15.44%, in EAFD. The general XPS spectra show that consist O, Mg Si elements. addition, also includes aluminum carbon, calcium potassium are other major elements peaks appeared range 577-589 eV confirm Besides, at 1022 1045 point out zinc Based on atomic ratio, Cr contents obtained 0.505 0.987%, respectively further 2.594% Zn. detailed analysis indicates exists two oxidation states, trivalent forms 2p orbitals. Specifically, 2p3/2 orbitals, assigned 577.1 579.2 eV, whereas 586.9 588.9 2p1/2 Furthermore, corresponding intensities these higher By comparing peak intensities, relative proportions (VI) calculated 49.44 49.53% EAFD, respectively. leaching tests solubilities all metals except far below toxicity limits waste even ranges non-hazardous waste. filtrates determined 0.862 268.050 mg/l Considering chromium, can be surely labeled a highly whereas, hand, within conclusion, it said must reduced immobile sample prior disposed landfills.