The efficiency of quartz addition on electric arc furnace (EAF) carbon steel slag stability

•A method to stabilize EAF slag was implemented in an actual steel plant.•The stabilization treatment lead to the formation of slag with gehlenite matrix.•The stabilization process efficacy was confirmed by several leaching tests.•Gehlenite inhibits heavy metals leaching. Electric arc furnace slag (...

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Bibliographic Details
Published in:Journal of hazardous materials 2014-08, Vol.279, p.586-596
Main Authors: Mombelli, D., Mapelli, C., Barella, S., Gruttadauria, A., Le Saout, G., Garcia-Diaz, E.
Format: Article
Language:English
Subjects:
Applied sciences
Chemical engineering
Civil Engineering
Crystallization, leaching, miscellaneous separations
EAF
EAF slag
Electric arc furnaces
Engineering Sciences
Exact sciences and technology
Fluid dynamics
Fluid flow
General treatment and storage processes
Hydraulics
Industrial Waste - analysis
Iron and steel making
Leaching behavior
Liquid-on-solid ratio
Materials
Microscopy, Electron, Scanning
Other industrial wastes. Sewage sludge
Pollution
Quartz - chemistry
Quartz addition
Silicon dioxide
Slags
Solubility
Stabilization process
Steel - chemistry
Wastes
Water - chemistry
X-Ray Diffraction
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Summary:•A method to stabilize EAF slag was implemented in an actual steel plant.•The stabilization treatment lead to the formation of slag with gehlenite matrix.•The stabilization process efficacy was confirmed by several leaching tests.•Gehlenite inhibits heavy metals leaching. Electric arc furnace slag (EAF) has the potential to be re-utilized as an alternative to stone material, however, only if it remains chemically stable on contact with water. The presence of hydraulic phases such as larnite (2CaO SiO2) could cause dangerous elements to be released into the environment, i.e. Ba, V, Cr. Chemical treatment appears to be the only way to guarantee a completely stable structure, especially for long-term applications. This study presents the efficiency of silica addition during the deslagging period. Microstructural characterization of modified slag was performed by SEM and XRD analysis. Elution tests were performed according to the EN 12457-2 standard, with the addition of silica and without, and the obtained results were compared. These results demonstrate the efficiency of the inertization process: the added silica induces the formation of gehlenite, which, even in caustic environments, does not exhibit hydraulic behaviour.
ISSN:0304-3894
1873-3336
DOI:10.1016/j.jhazmat.2014.07.045