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Recovery of zinc and manganese from pyrometallurgy sludge by hydrometallurgical processing.

Mocellin, Julien; Mercier, Guy; Morel, Jean-Louis; Charbonnier, Patrick; Blais, Jean-François; Simonnot, Marie-Odile (2017). Recovery of zinc and manganese from pyrometallurgy sludge by hydrometallurgical processing. Journal of Cleaner Production , vol. 168 . p. 311-321. DOI: 10.1016/j.jclepro.2017.09.003.

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Résumé

In this contribution, a hydrometallurgical process is specifically developed to recover zinc (Zn), manganese (Mn) and lead (Pb) from the pyrometallurgical sludge produced in the steel manufacturing industries. The optimum conditions for Zn and Mn selective leaching from the pyrometallurgical sludge of Pompey have been already found. This process consists of six unit operations: 1) Selective Zn leaching. At this stage, 80.8–100% of Zn is extracted.2) Selective Mn leaching, with two reductive leaching steps: fixed pH range from 3.5 to 4.2 and redox potential lower than 400 mV, using H₂SO₄ and Na₂S₂O₅ as the reducing agent. In this step, 77.6–95.9% of Mn is recovered.3) Removal of aluminum (Al) and iron (Fe) from Zn leach liquor by chemical precipitation at pH 4.8 with NaOH.4) Removal of Al, Zn and Pb by sulfide precipitation (Na₂S) from Mn leach liquor (2) at pH 5.6.5) Zn precipitation (as sphalerite) using twice the stoichiometry value of Na₂S (considering the concentration of Zn).6) Mn precipitation (as rhodochrosite) at pH 8.5 using Na₂CO₃ as the precipitation agent.This process is tested with four different raw materials, which demonstrates its reliability.

Type de document: Article
Mots-clés libres: pyrometallurgical sludge; selective leaching; precipitation; manganese carbonate; zinc sulfide
Centre: Centre Eau Terre Environnement
Date de dépôt: 08 mai 2018 14:12
Dernière modification: 08 mai 2018 14:12
URI: http://espace.inrs.ca/id/eprint/6500

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