title: Formation of the ZnFe2O4 phase in an electric arc furnace off-gas treatment system.
abstract: To better understand the phenomena of ZnFe2O4 spinel formation in electric arc furnace dust, the dust was characterized with particle size analysis, X-ray fluorescence (XRF), electron backscatter diffraction (EBSD), and electron probe micro-analysis (EPMA). Different ZnFe2O4 formation reaction extents were observed for iron oxide particles with different particle sizes. ZnO particles were present as both individual particles and aggregated on the surface of larger particles. Also, the slag particles found in the off-gas were shown not to react with the zinc vapor. After confirming the presence of a ZnFe2O4 formation reaction, the thermodynamic feasibility of in-process separation - a new electric arc furnace dust treatment technology - was reevaluated. The large air intake and the presence of iron oxide particles in the off-gas were included into the thermodynamic calculations. The formation of the stable ZnFe2O4 spinel phase was shown to be thermodynamically favorable in current electric arc furnace off-gas ducts conditions even before reaching the post combustion chamber.
authors: KU Leuven, Department of Materials Engineering, Kasteelpark Arenberg 44 - Bus 2450, 3001 Leuven, Belgium. Electronic address: thomas.suetens@mtm.kuleuven.be.
authors: T
authors: T
authors: Suetens
authors: KU Leuven, Department of Materials Engineering, Kasteelpark Arenberg 44 - Bus 2450, 3001 Leuven, Belgium. Electronic address: muxing.guo@mtm.kuleuven.be.
authors: M
authors: M
authors: Guo
authors: KU Leuven, Department of Materials Engineering, Kasteelpark Arenberg 44 - Bus 2450, 3001 Leuven, Belgium. Electronic address: karel.vanacker@lrd.kuleuven.be.
authors: K
authors: K
authors: Van Acker
authors: KU Leuven, Department of Materials Engineering, Kasteelpark Arenberg 44 - Bus 2450, 3001 Leuven, Belgium. Electronic address: bart.blanpain@mtm.kuleuven.be.
authors: B
authors: B
authors: Blanpain
mesh_terms: D000393:Air Pollutants / Q000032:analysis / Q000737:chemistry*; D004391:Dust / Q000032:analysis; D005290:Ferric Compounds / Q000737:chemistry*; D007220:Industrial Waste / Q000032:analysis; D013816:Thermodynamics; D018505:Waste Management / Q000379:methods; D015032:Zinc / Q000032:analysis / Q000737:chemistry*
chemical_list: D000393:Air Pollutants; D004391:Dust; D005290:Ferric Compounds; D007220:Industrial Waste; C000499:ferric oxide; D015032:Zinc
keywords: Characterization; Electric arc furnace dust; Franklinite (ZnFe(2)O(4)); In-process separation; Thermodynamics