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Assessment of the effect of acids application during the electrodialytic recovery of lithium from mine tailings
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Resumo(s)
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.
Descrição
This work has received funding from the Horizon Europe program, grant agreement number 101069789: project RELiEF \u2013 Recycling of Lithium from secondary raw materials and further.
The authors would like to thank Pegmatitica - Sociedade Mineira de Pegmatites, Lda, for providing the working sample. This research was anchored by the RESOLUTION LAB, an infrastructure at NOVA School of Science and Technology. Disclaimer: Funded by the European Union. Views and opinions expressed are however those of the authors only and do not necessarily reflect those of the European Union. Neither the European Union nor the granting authority can be held responsible for them. [Figure presented]
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© 2024 The Author(s)
Palavras-chave
Acid Critical raw material Decarbonisation Electro-based technology Lithium Mine tailings General Chemical Engineering Electrochemistry SDG 7 - Affordable and Clean Energy SDG 13 - Climate Action