Hydrometallurgical Process to Recover Cobalt from Spent Li-Ion Batteries

Neila Djoudi, Marie Le Page Mostefa and Hervé Muhr
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Neila Djoudi: Laboratoire Réactions et Génie des Procédés (LRGP) UMR 7274 CNRS, Université de Lorraine, 1 rue Grandville BP20451, 54001 Nancy, France
Marie Le Page Mostefa: Laboratoire Réactions et Génie des Procédés (LRGP) UMR 7274 CNRS, Université de Lorraine, 1 rue Grandville BP20451, 54001 Nancy, France
Hervé Muhr: Laboratoire Réactions et Génie des Procédés (LRGP) UMR 7274 CNRS, Université de Lorraine, 1 rue Grandville BP20451, 54001 Nancy, France

Resources, 2021, vol. 10, issue 6, 1-14

Abstract: The growth of the lithium-ion battery industry requires a secure supply of raw materials and appropriate end-of-life management of batteries. In almost five years, global cobalt consumption has increased by nearly 30%, driven mainly by rechargeable batteries. Consequently, several risks have been identified for cobalt, in particular the growing demand for electric vehicles, which could exceed current production. Therefore, research into the recovery of this critical metal, from industrial or urban waste, is particularly important in the years to come. In this study, cobalt is recovered from a lithium-ion battery leachate in hydroxide form. The thermodynamic simulations performed with Visual Minteq showed that it was possible to recover 99.8% of cobalt (II) hydroxide at 25 °C. 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 operating parameters were studied to determine the optimal conditions for cobalt recovery, in terms of yield, filterability, and selectivity. Results obtained in a batch reactor allowed the determination of the temperature conditions to be applied in continuous reactor. The cobalt (II) hydroxide precipitation in continuous reactor was carried out under different pH conditions. It was then possible to determine the optimal conditions for cobalt recovery in terms of yield and filterability. Results showed that working at pH 9 would effectively meet the desired criteria. Indeed, cobalt recovery is close to 100% and filtration flow rate is three times higher. Results obtained allow a better understanding of cobalt (II) hydroxide precipitation.

Keywords: cobalt; hydrometallurgy; precipitation; process; li-ion battery recycling (search for similar items in EconPapers)
JEL-codes: Q1 Q2 Q3 Q4 Q5 (search for similar items in EconPapers)
Date: 2021
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