Processing of spent button cells

Química Nova

Afonso, Julio Carlos¹  Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brasil¹  Silva, Cristiano Nunes da¹ 

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 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.

【 授权许可】

Unknown