Recovery of cobalt and lithium from end-of-life Li-ion battery wastes have been evaluated in batch and semi-batch leaching systems. In this preliminary study, HCl and HO were used as leaching and reducing agents, respectively. The comparison of batch and semi-batch processes was carried out, obtaining an improvement from 40% to 70% in the metal mass extracted ( Co and Li) for semi-batch experiments under the same experimental conditions. Effects of the initial concentration of reducing and leaching agents were evaluated for a semi-batch system in which the acid was continuously fed to maintain a constant pH value. From experimental results, it was found that the concentration of HO plays an important role in the leaching process in terms of selectivity. For the experiments carried out using 0.1 M of HCl and 1 M of HO, the percentage of Li and Co extracted was 90% for a leaching time of 30 min. The double-controlled addition of HCl and HO to the semi-batch system allows the reduction of the HO concentration to 0.5 M. The optimization of reactants entails not only the decrease of their consumption but also maximize the selectivity of the reactions desired, which represents promising results for the environmental sustainability of the process. Further work will examine the fate of chloride ions in the process.

中文翻译：

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在控制 HCl 和 H2O2 添加条件下浸出电池正极 (LiCoO2) 的间歇式和半间歇式反应器的比较


从报废锂离子电池废料中回收钴和锂已经在分批和半分批浸出系统中进行了评估。在这项初步研究中，HCl 和 H2O 分别用作浸出剂和还原剂。对间歇式和半间歇式工艺进行了比较，在相同的实验条件下，半间歇式实验的金属质量（Co 和 Li）提取量从 40% 提高到 70%。对半间歇系统中还原剂和浸出剂初始浓度的影响进行了评估，其中连续加入酸以维持恒定的 pH 值。实验结果发现，H2O浓度在浸出过程中的选择性方面起着重要作用。对于使用 0.1 M HCl 和 1 M H2O 进行的实验，浸出时间为 30 分钟时，Li 和 Co 的提取百分比为 90%。向半间歇系统中双重控制添加 HCl 和 H2O，可将 H2O 浓度降低至 0.5 M。反应物的优化不仅需要减少其消耗，还需要最大限度地提高所需反应的选择性，这代表该过程的环境可持续性取得了可喜的结果。进一步的工作将检查该过程中氯离子的命运。