Formation of the ZnFe2O4 phase in an electric arc furnace off-gas treatment system

Suetens, Thomas; Guo, Muxing; Acker, Karel Van; Blanpain, Bart

doi:10.1016/j.jhazmat.2015.01.050

Cited by 33 publications

(25 citation statements)

References 9 publications

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“…The EAFD from the Esch-Belval ArcelorMittal plant characterized in our previous work has a fairly uniform particle size distribution from 0.7 to 40 lm [6]. Dust with a higher abundance of small supra-micron particles has also been reported [8].…”

Section: The Particle Size Distributionmentioning

confidence: 88%

“…This approximation is reasonable since, even for typical EAF air intake ratios, metallic Zn is thermodynamically stable compared to ZnO at high temperatures ([1300°C) [6]. At lower temperatures, ZnO will become more stable.…”

Section: Approximationmentioning

confidence: 97%

“…However, in previous work, we already found that the formation of ZnFe 2 O 4 only starts at temperatures lower than 1500 C for the average zinc vapor pressure present in EAF off-gas [6]. Therefore, only time spent below 1500 C was considered when determining the time-temperature profile.…”

Section: Input Parametersmentioning

confidence: 99%

“…The total sum of the zinc and iron oxides in the dust remains constant around 70 wt% [6]. The Esch-Belval dust is a zinc rich dust with a zinc and iron content of 27 and 29 wt%, respectively.…”

Section: The Eafd Compositionmentioning

confidence: 99%

“…Unlike the first IPS feasibility assessment [3], we included the air intake and the presence of iron oxide particles in the off-gas. We found that, thermodynamically, Zn vapor will react with magnetite to form franklinite (Reaction 1) [6]. In order to understand the impact of this reaction on the composition of the solid particles in the EAF off-gas, the reaction kinetics were studied and diffusion coefficients describing the reaction were found [7].…”

Section: Introductionmentioning

confidence: 99%

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Zn Loss into ZnFe2O4 in an Open Type Electric Arc Furnace: An In-Process Separation Performance Model

Suetens

Guo

Acker

et al. 2015

J. Sustain. Metall.

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In order to reduce the burden of electric arc furnace dust on steel recycling plants, a new technology called in-process separation (IPS) was proposed. By separating Zn vapor from the solid particles in the electric arc furnace off-gas, production of Zn-containing electric arc furnace dust may be prevented. However, the spinel formation reaction at high temperatures and its impact on the technology's feasibility still require better understanding. This paper demonstrates a model that was developed to provide this insight, based on the results of our previous work on the kinetics of the spinel formation.This model evaluates the performance of IPS based on four key process parameters: the position of the separation unit, the timetemperature profile inside the off-gas duct, the solid particle size distribution, and the initial Zn and Fe content of the off-gas. The impact on the efficiency of each parameter was demonstrated using the results of the model for a specific off-gas treatment setup.

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Section: The Particle Size Distributionmentioning

confidence: 88%

Section: Approximationmentioning

confidence: 97%

Section: Input Parametersmentioning

confidence: 99%

Section: The Eafd Compositionmentioning

confidence: 99%