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Conception, développement et mise au point d'un procédé hydrométallurgique de récupération du cobalt (II) issu de mines secondaires par précipitation

Abstract : Cobalt is one of the fifty strategic metals considered essential for the industry and which are at the heart of global economic and geopolitical issues. This is why, research into the recovery of this critical metal, from industrial or urban waste, are particularly important for the years to come. The subject of the thesis is the development of a hydrometallurgical process to recover cobalt from a Li-ion battery leachate by precipitation. The first part of the thesis focused on the precipitating agent choice, which must meet a certain number of criteria in order to recover cobalt efficiently. Based on these criteria, a comparative study of the different precipitating agents was carried out. It was based on the literature as well as on the simulations of thermodynamic equilibria carried out in Visual Minteq 3.0. The results showed that it was possible to recover 99.8% of cobalt, in the hydroxide form. Based on these results, experiments were conducted to validate the hypotheses put forward and to compare the results obtained with the simulations performed. Experimentally, several parameters were studied in order to determine the optimal conditions for cobalt recovery, in terms of yield, filterability and selectivity. Certain parameters such as supersaturation can influence the product obtained typology (particle size, agglomerate size, polymorphism...). The selected polymorph should allow to obtain the highest yields and the lowest filtration times. Subsequently, the research focused on the study of complex synthetic media containing cobalt and manganese, thus getting closer to the real conditions of Li-ion battery leachates, and appearing on the proposed process scheme. Experimental results were compared to simulations previously carried out. Finally, based on the results obtained in discontinuous mode, experiments were carried out in continuous mode. It was possible to determine the optimal parameters for cobalt recovery and to extrapolate them to the pilot scale in a fluidized bed reactor, allowing the process to be considered on a larger scale.
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Submitted on : Monday, March 15, 2021 - 4:46:51 PM
Last modification on : Monday, March 29, 2021 - 4:07:36 PM
Long-term archiving on: : Wednesday, June 16, 2021 - 7:19:27 PM

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Neila Djoudi. Conception, développement et mise au point d'un procédé hydrométallurgique de récupération du cobalt (II) issu de mines secondaires par précipitation. Génie des procédés. Université de Lorraine, 2021. Français. ⟨NNT : 2021LORR0010⟩. ⟨tel-03169825⟩

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