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Steel Slag Characterisation—Benefit of Coupling Chemical, Mineralogical and Magnetic Techniques

Maud Herbelin 1, 2 Jérôme Bascou 2, 1 Véronique Lavastre 2, 1 Damien Guillaume 2, 1 Mhammed Benbakkar 2 Steve Peuble 3 Jean-Philippe Baron 4 
1 LMV-ENSMSE - Laboratoire Magmas et Volcans
Mines Saint-Étienne MSE - École des Mines de Saint-Étienne, SPIN, CNRS - Centre National de la Recherche Scientifique : UMR6524, LMV - Laboratoire Magmas et Volcans : UMR 6524
Abstract : Steel-making slag is largely used today in road construction and other applications,but significant volumes are landfilled and cannot be recycled for excessive contents in hazardousmetals, such as chromium or vanadium. The long-term behaviour of this material is still littleknown, and the characterisation of large volume slag dumps remains an environmental challenge.In this study various analytical techniques are used to characterise Electric Arc Furnace (EAF) slaglandfilled for several decades and exposed to chemical weathering and erosion. Coupling chemical,mineralogical and magnetic techniques helps to understand the relations between hazardous metalsand mineral phases. A special interest is given to Fe-bearing minerals microstructure so as tolink the magnetic properties of the material to its mineralogical composition. The studied slagpresents high amounts of chromium (between 1 and 3 wt. %) and very high magnetic susceptibilityvalues(near 60×10−6m3/kg), explained by the presence of magnetite and a spinel solid solution.Some correlations are found between magnetic susceptibility and potentially hazardous metals,providing new perspectives for future environmental investigations.
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https://hal.uca.fr/hal-03075360
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Submitted on : Wednesday, December 16, 2020 - 1:45:50 PM
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Maud Herbelin, Jérôme Bascou, Véronique Lavastre, Damien Guillaume, Mhammed Benbakkar, et al.. Steel Slag Characterisation—Benefit of Coupling Chemical, Mineralogical and Magnetic Techniques. Minerals, MDPI, 2020, 10 (8), pp.705. ⟨10.3390/min10080705⟩. ⟨hal-03075360⟩

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