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This paper describes the leaching experiments and the electrowinning tests to recover Zn and Mn from spent household alkaline batteries. After the dismantling of the batteries, the black powder was analyzed and found to contain 21wt.% Zn and 45%wt. Mn. Therefore, it was considered that recovery of these metals would be interesting due to their relatively large amounts in this kind of waste. Batch...
The rechargeability of γ-MnO2 cathodes in alkaline batteries is limited by the formation of the [Mn2]O4 spinels ZnMn2O4 (hetaerolite) and Mn3O4 (hausmannite). However, the time and formation mechanisms of these spinels are not well understood. Here we directly observe γ-MnO2 discharge at a range of reaction extents distributed across a thick porous electrode. Coupled with a battery model, this reveals...
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