Energy transition has been driven by climate change and the need to decarbonize the transport sector. Herein, lithium-ion batteries play a prominent role in transports electrification and renewable energy sources integration, which has been increasing lithium demand worldwide. To alleviate lithium primary resources exploitation, the use of secondary resources of lithium are desirable, considering a circular perspective. Mine tailings are generated in massive volumes, due to low ore grades, and may present contents of lithium-based minerals. Therefore, proper management is required to guarantee the safety of this resource, offering also an opportunity for secondary recovery of critical raw materials, such as lithium. The present work aimed to analyse the potential of the electrodialytic process to recover lithium from mine tailings with lepidolite contents. The addition of inorganic and organic acids was tested, to address the synergy between the electrodialytic process and acids extraction. Pre-heat of the solid suspension and of the solid sample was also considered. Bench scale experiments were conducted considering a two-compartment electrodialytic reactor at 100 mA, with a cation exchange membrane interposed. Eight different acids, at concentrations of 0.1 mol/L and 0.5 mol/L, were tested individually and in mixture, during 3, 4 and 10 days. The highest lithium recovery ratio (29.8%) was obtained for the experiment conducted with oxalic acid at 0.5 mol/L and suspension pre-heated (55 °C) for 24 h These conditions improved chemical reactivity and the dissolution of lithium minerals.

中文翻译：

---

评估从矿山尾矿中电渗析回收锂过程中施酸的影响


气候变化和运输部门脱碳的需求推动了能源转型。其中，锂离子电池在交通电气化和可再生能源整合中发挥着重要作用，这一直在增加全球锂需求。为了减少锂原生资源的开采，考虑到循环角度，使用锂的原生资源是可取的。由于矿石品位低，矿山尾矿大量产生，并且可能含有锂基矿物。因此，需要适当的管理来保证这种资源的安全，同时也为锂等关键原材料的二次回收提供了机会。目前的工作旨在分析电渗析过程从锂云母含量的尾矿中回收锂的潜力。测试了无机酸和有机酸的添加，以解决电渗析过程和酸萃取之间的协同作用。还考虑了固体悬浮液和固体样品的预热。在100 mA的双室电渗析反应器中，中间插入阳离子交换膜，进行了实验室规模的实验。在 3 、 4 和 10 天内，对浓度为 0.1 mol/L 和 0.5 mol/L 的 8 种不同酸进行单独和混合测试。使用 0.5 mol/L 草酸和悬浮液预热 （55 °C） 24 h 进行实验，获得最高的锂回收率 （29.8%）这些条件改善了化学反应性和锂矿物的溶解。