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Ressources secondaires de métaux, valorisation par voie hydrométallurgique de résidus de sidérurgie pour la valeur en zinc, en manganèse et plomb

Abstract : During the XIXth and XXth centuries, steel industry has been one of the main sources of wealth in France. However, ferromanganese manufacturing has produced huge quantities of wastes, for instance after blast-furnace gas washing. The residual sludge, containing high concentrations of zinc (Zn), manganese (Mn) and lead (Pb) (5 to 40 wt %), has been deposited in ponds, in the vicinity of steel-making plants. Since plant closure, these fields have been left untouched; some of them, like in Pompey (Lorraine) have been colonized by vegetation. These sites may be considered as a threat to health and environment and should be cleaned up. Nevertheless, with awareness of metal shortage, these ponds may be considered as deposits of secondary resources. This works aims at designing a hydrometallurgical process to extract Zn, Mn and Pb from these residues and recover them in a valuable form, while decontaminating the sites. At first, experiments have enabled us to determine the optimal conditions (acid concentration, duration, temperature, reactant addition, pulp density) to extract selectively Zn and Mn from the sludge and leave a Pb-rich residue. Then, Zn was recovered as ZnO or ZnS after precipitation or as Zn after electrowinning. Mn was recovered as MnCO3 at an acceptable purity. A technico-economic study has been done to assess the industrial interest of the process
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  • HAL Id : tel-01754632, version 1

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Julien Mocellin. Ressources secondaires de métaux, valorisation par voie hydrométallurgique de résidus de sidérurgie pour la valeur en zinc, en manganèse et plomb. Alimentation et Nutrition. Université de Lorraine, 2015. Français. ⟨NNT : 2015LORR0211⟩. ⟨tel-01754632⟩

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