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Study of the factors influencing the metals solubilisation from a mixture of waste batteries by response surface methodology.

Tanong, Kulchaya; Coudert, Lucie; Chartier, Myriam; Mercier, Guy; Blais, Jean-François (2017). Study of the factors influencing the metals solubilisation from a mixture of waste batteries by response surface methodology. Environmental Technology , vol. 38 , nº 24. p. 3167-3179. DOI: 10.1080/09593330.2017.1291756.

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Résumé

This paper presents an innovative process for the recovery of valuable metals from a mixture of spent batteries. Different types of batteries, including alkaline, zinc-carbon (Zn-C), nickel cadmium (Ni-Cd), nickel metal hydride (Ni-MH), lithium ion (Li-ion) and lithium metallic (Li-M) batteries, were mixed according to the proportion of the Canadian sales of batteries. A Box-Behnken design was applied to find the optimum leaching conditions allowing a maximum of valuable metal removals from a mixture of spent batteries in the presence of an inorganic acid and a reducing agent. The results highlighted the positive effect of sodium metabisulfite on the performance of metals removal, especially for Mn. The solid/liquid ratio and the concentration of H₂SO₄ were the main factors affecting the leaching behavior of valuable metals (Zn, Mn, Cd, Ni) present in spent batteries. Finally, the optimum leaching conditions were found as follows: one leaching step, solid/liquid ratio = 10.9%, [H₂SO₄] = 1.34 M, sodium metabisulfite (Na₂S₂O₅) = 0.45 g/g of battery powder and retention time = 45 min. Under such conditions, the removal yields achieved were 94% for Mn, 81% for Cd, 99% for Zn, 96% for Co and 68% for Ni.

Type de document: Article
Mots-clés libres: Box-Behnken design; reducing agent; sulfuric acid; leaching; spent batteries
Centre: Centre Eau Terre Environnement
Date de dépôt: 08 mai 2018 14:47
Dernière modification: 08 mai 2018 14:47
URI: http://espace.inrs.ca/id/eprint/6576

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