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Recovery of metals from a mixture of various spent batteries by a hydrometallurgical process.

Tanong, Kulchaya; Coudert, Lucie; Mercier, Guy; Blais, Jean-François (2016). Recovery of metals from a mixture of various spent batteries by a hydrometallurgical process. Journal of Environmental Management , vol. 181 . p. 95-107. DOI: 10.1016/j.jenvman.2016.05.084.

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Résumé

Spent batteries contain hazardous materials, including numerous metals (cadmium, lead, nickel, zinc, etc.) that are present at high concentrations. Therefore, proper treatment of these wastes is necessary to prevent their harmful effects on human health and the environment. Current recycling processes are mainly applied to treat each type of spent battery separately. In this laboratory study, a hydrometallurgical process has been developed to simultaneously and efficiently solubilize metals from spent batteries. Among the various chemical leaching agents tested, sulfuric acid was found to be the most efficient and cheapest reagent. A Box-Behnken design was used to identify the influence of several parameters (acid concentration, solid/liquid ratio, retention time and number of leaching steps) on the removal of metals from spent batteries. According to the results, the solid/liquid ratio and acid concentration seemed to be the main parameters influencing the solubilization of zinc, manganese, nickel, cadmium and cobalt from spent batteries. According to the results, the highest metal leaching removals were obtained under the optimal leaching conditions (pulp density = 180 g/L (w/v), [H2₂SO₄] = 1 M, number of leaching step = 3 and leaching time = 30 min). Under such optimum conditions, the removal yields obtained were estimated to be 65% for Mn, 99.9% for Cd, 100% for Zn, 74% for Co and 68% for Ni. Further studies will be performed to improve the solubilization of Mn and to selectively recover the metals.

Type de document: Article
Mots-clés libres: spent batteries; leaching; Box-Behnken design; sulfuric acid; hydrometallurgical process; metals
Centre: Centre Eau Terre Environnement
Date de dépôt: 03 mai 2018 18:34
Dernière modification: 03 mai 2018 18:34
URI: http://espace.inrs.ca/id/eprint/4711

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