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Caractérisation à différentes échelles des laitiers sidérurgiques et traçage des processus d'altération par une approche multi-méthodes (chimie, minéralogie, magnétisme)

Maud Herbelin 1 
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 : More than 400 million tonnes of steel slag are produced every year worldwide. Although most of it is now recycled, mainly in the form of aggregates, large quantities are still landfilled every year (from 1 to 4 million tonnes in Europe). The presence of potentially toxic metallic trace elements (Cr, V, Mo) is one of the main obstacles to the recovery of this slag. It is necessary to know the long-term behaviour of these materials in order to predict the leaching of the metals they contain and their dispersion in the environment. In this thesis we focus on a steel-making site belonging to the Industeel - ArcelorMittal group and located in Châteauneuf (Loire, France). Several thousand tonnes of electric arc furnace slag were accumulated there over several decades, exposed to meteoric weathering. The objective is to characterise as finely as possible, at the scale of the sample but also of the slag heap, the mineralogical variations and to better understand the transformation processes that occur during the weathering of these materials. Different analytical techniques are used both in the laboratory and in the field. The coupling of chemical, mineralogical and magnetic analyses allowed a detailed characterisation of this slag which have already been partially altered. Then the installation of lysimeters and leaching tests helped to assess the mobility of the metals present and to understand the mineralogical transformations that take place during alteration.
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Submitted on : Wednesday, July 6, 2022 - 11:30:18 AM
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Maud Herbelin. Caractérisation à différentes échelles des laitiers sidérurgiques et traçage des processus d'altération par une approche multi-méthodes (chimie, minéralogie, magnétisme). Sciences de la Terre. Université de Lyon, 2021. Français. ⟨NNT : 2021LYSES010⟩. ⟨tel-03715274⟩

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