processamento de pilhas do tipo botão processing of spent button cells
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processamento de pilhas do tipo botão processing of spent button cells

;Cristiano Nunes da Silva;Julio Carlos Afonso
greece and rome 2008 Vol. 31 pp. 1567-1572
97
silva2008qumicaprocessamento

Abstract

This work presents hydrometallurgical routes for recovering valuable elements from spent button cells, based on leaching of internal components with sulfuric acid (Li/MnO2 and Zn-air) or nitric acid (Ag-Zn), at 90 ºC for 2h. Slow evaporation of the leachate crystallized MnSO4.H2O, whereas lithium was partially recovered as LiF. Mercury present in Zn-air and Ag-Zn samples was precipitated as HgS. Silver was recovered as AgCl before mercury precipitation. Zinc and iron were precipitated as hydroxides. The amount of iron varied according to the intensity of the corrosion of the external cell case. Final wastes are neutral and colorless sodium sulfate/nitrate solutions.

Keywords

metal recovery waste managementchemistry button cell

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DOI:
10.1590/S0100-40422008000600048
URL:
http://www.scielo.br/scielo.php?script=sci_arttext...

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ID: 212470
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