BackgroundBatteries play a vital role in meeting global energy needs. When their life cycle concludes, improperly discarded spent batteries can pose environmental risks primarily due to their metal content. In this sense, the recycling of metals contained in spent batteries could mean a huge advantage if they are extracted and purified using environmentally friendly processes.ResultsIn this study, the recovery of potassium (K), zinc (Zn) and manganese (Mn) from alkaline batteries was performed using a hydrometallurgical process consisting of neutral, acid and acid reductive leaching steps at room temperature and atmospheric pressure to extract K, Zn and Mn. In the neutral leaching step, 76.8 ± 3.4 (wt. %) of the K present in the spent batteries was extracted. Thus, in the acid leaching step, 90.9 ± 0.1 (wt. %) of the initial Zn and 36.7 ± 0.4 (wt. %) of the initial Mn was extracted using sulfuric acid (H2SO4) 2 M. In a subsequent acid reductive leaching step using H2SO4 2 M and oxygen peroxide (H2O2) 0.8 M as reducing agent, 8.7 ± 0.1 (wt. %) of the initial Zn and up to 49.4 ± 0.2 (wt. %) of the initial Mn were extracted.ConclusionThe three‐unit process led to an overall extraction of 99.6 ± 0.3 (wt. %) of Zn and 86.1 ± 0.1 (wt. %) of Mn. Regarding the latter step, the extraction was not 100% because Mn complexes which are nearly insoluble were generated. This shows that extraction of valuable minerals from industrial residues is possible by hydrometallurgical processes.This article is protected by copyright. All rights reserved.

中文翻译：

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三单元湿法冶金工艺从废碱性电池中提取和分离钾、锌和锰

背景电池在满足全球能源需求方面发挥着至关重要的作用。当其生命周期结束时，不当丢弃的废电池可能会因其金属含量而造成环境风险。从这个意义上说，如果使用环保工艺提取和纯化废电池中所含的金属，回收利用可能意味着巨大的优势。结果在这项研究中，从废电池中回收钾 (K)、锌 (Zn) 和锰 (Mn)碱性电池采用湿法冶金工艺，包括中性、酸性和酸还原浸出步骤，在室温和大气压下提取钾、锌和锰。在中性浸出步骤中，废电池中存在的 76.8 ± 3.4（重量%）的 K 被提取出来。因此，在酸浸步骤中，使用硫酸 (H2SO4) 2 M 提取了 90.9 ± 0.1（重量%）的初始 Zn 和 36.7 ± 0.4（重量%）的初始锰。在随后的酸还原浸出中步骤使用 H2SO4 2 M 和过氧化氢 (H2O2) 0.8 M 作为还原剂，提取了 8.7 ± 0.1 (wt. %) 的初始 Zn 和高达 49.4 ± 0.2 (wt. %) 的初始 Mn。结论该单元工艺的总锌提取量为 99.6 ± 0.3（重量％），锰总提取量为 86.1 ± 0.1（重量％）。对于后一步，提取不是100%，因为生成了几乎不溶的Mn络合物。这表明通过湿法冶金工艺从工业残留物中提取有价值的矿物是可能的。本文受版权保护。版权所有。