Naslov
Characterization of steel mill electric-arc furnace dust

Autori
Sofilić, Tahir ; Rastovčan-Mioč, Alenka ; Cerjan-Stefanović, Štefica ; Novosel-Radović, Vjera ; Jenko, Monika

Izvornik
Journal of hazardous materials (0304-3894) 109 (2004); 59-70

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
metallurgical waste; EAFD; characterization; leaching; chemical analysis

Sažetak
In order to make a complete Characterization of Electric-Arc Furnace (EAF) Dust, as hazardous industrial waest, and to solve its permanent disposal and/or recovery, bearing in mind both the volumes formed in the Croatian steel industry and experiences of developed industrial countries, a study of its properties was undertaken. For this purpose, samples of EAF dust, taken from the regular production process in the Željezara Sisak Steel Mill between December 2000 and December 2001, werw subjected to a series of tests. The chemical composition of EAF dust samples was investigated by means of a several different analytical methods. The results from the chemical analysis show that the approximate order of abundance of major elements in EAF dusts is as follows: Fe, Zn, Mn, Ca, Mg, Si, Pb, S, Cr, Cu, Al, C, Ni, Cd, As, and Hg. Granular-metric composition of single samples was determined by applying sieve separation. Scanning electron micro-structural examination of EAF dust microstructure was performed and results indicated that all twelve EAF dusts were composed of solid spherical agglomeraters with Fe, Zn, Pb, O, Si and Ca as the principal element.The investigation of grain morphology and the mineralogical compostion of EAF dust werw taken by combination of high resolution Auger electron spectroscopy (HR AES), X-ray photoelectron spectroscopy (XPS) and X-ray powder diffraction analysis. The analysis of XPS-spectra determined the presence of zine in the form of ZnO phase and the presence of lead in the form of PbO phase, i.e.PbSO3/PbSO4 forms.The results of the X-ray diffraction phase analysis show that the basis of the examined EAF dust samples is made of a mixture of metal oxides, silicates and sulphates. The metal concentraqtion, anions, pH value and condustivity in water eluates was determined in order to define the influence of EAF dust on the environment.

Izvorni jezik
Engleski

Znanstvena područja
Kemija

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