Characterization study of electric arc furnace dust phases

Abstract

Electric arc furnace dust (EAFD) is a solid waste generated in the collection of particulate material during steelmaking process in electric arc furnace. The aim of this work is to carry out a chemical and structural characterization of two EAFD samples with different Zn contents. Optical emission spectroscopy via inductively coupled plasma (ICP), X ray diffractometry (XRD) and Mössbauer spectroscopy analysis were carried out in such EAFD samples. From XRD measurements, the samples exhibits the following phases: ZnFe2O4, Fe3O4, MgFe2O4, FeCr2O4, Ca0.15Fe2.85O4, MgO, Mn3O4, SiO2 and ZnO. The phases detected by Mössbauer spectroscopy were: ZnFe2O4, Fe3O4, Ca0.15Fe2.85O4 and FeCr2O4. Magnesium ferrite (MgFe2O4), observed in the XRD patterns as overlapped peaks, was not identified in the Mössbauer spectroscopy analysis

Thermodynamic modelling of the formation of zinc–manganese ferrite spinel in electric arc furnace dust

“…The amount of zinc oxide increases monotonically with the amount of zinc in the dust. These results are in general agreement with the characterization of actual EAF dusts where it has been observed that the amount of zinc ferrite in the dusts decreases with increasing zinc to iron ratio [8]. The equilibrium composition of the ZMFO is shown in Fig.…”

“…There have been a large number of studies on the characterization of EAF dust and each dust is site-specific [7][8][9][10][11][12][13][14]. However, the zinc in the dust typically exists as zinc oxide (ZnO) and as a mixed zinc-manganese ferrite spinel or ZMFO ((Zn x Mn y Fe 1−x−y )Fe 2 O 4 ).…”

Carbothermic reduction of Electric Arc Furnace Dust via thermogravimetry

“…This estimation was conducted according to a procedure described by Machado et al (2006). Franklinite (36.8%), zincite (30.2%) and magnetite (7.9%) represent the majority of compounds found within the EAFD.…”

Thermodynamic analysis of the selective chlorination of electric arc furnace dust

“…Furthermore, the properties of each dust are site-specific since they depend upon the scrap composition and the furnace operating practice. Considerable research effort has been devoted to characterizing the dusts from steel plants in various countries [2][3][4][5][6][7][8][9]. The major elements present in the dust are usually zinc, iron * Tel.…”