Processing of spent button cells

Quimica nova

Afonso, Julio Carlos¹  Silva, Cristiano Nunes da¹ 

[1] Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brasil

关键词: button cell;    metal recovery;    waste management.;   

DOI  :  10.1590/S0100-40422008000600048

学科分类：化学（综合）

来源: Sociedade Brasileira de Quimica

【 摘 要 】

This work presents hydrometallurgical routesfor recovering valuable elements from spent button cells, based on leachingof internal components with sulfuric acid (Li/MnO2 and Zn-air) ornitric acid (Ag-Zn), at 90 ºC for 2h. Slow evaporation of the leachate crystallizedMnSO4.H2O, whereas lithium was partially recovered asLiF. Mercury present in Zn-air and Ag-Zn samples was precipitated as HgS. Silverwas recovered as AgCl before mercury precipitation. Zinc and iron were precipitatedas hydroxides. The amount of iron varied according to the intensity of the corrosionof the external cell case. Final wastes are neutral and colorless sodium sulfate/nitratesolutions.

【 授权许可】

CC BY