锂膜流动电容去离子(Li-MFCDI)从盐水中回收锂——概念验证

IF 4.9 Q1 ENGINEERING, CHEMICAL
H.M. Saif, J.G. Crespo, S. Pawlowski
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引用次数: 0

摘要

电动汽车和储能设备对锂的需求正在迅速增长,因此需要尽快探索/开发新的锂来源(如海水和天然或工业盐水)以及可持续的回收方法。这项工作提出了一种新的电膜工艺,称为锂膜流动电容去离子(Li-MFCDI),该工艺被测试用于从合成地热盐水中回收锂,其中钠的质量浓度远高于锂(超过650倍)。具体而言,将陶瓷锂选择膜集成到流动电容去离子(FCDI)电池中,该电池经过专门设计并3D打印,以允许对所使用的流动电极同时充电和再生。尽管进料流中Na+/Li+的质量比极高,但仍有99.98%的钠被截留,锂相对于其他单价阳离子的工艺选择性为:Li+/Na+为141±5.85,Li+/K+为46±1.46。Li-MFCDI工艺在7天的试验期内表现出稳定的性能,在提取溶液中回收的Li+的估计能耗为16.70±1.63kWh/kg。这些结果证明了Li-MFCDI在从盐水流中可持续回收锂方面的潜力。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Lithium recovery from brines by lithium membrane flow capacitive deionization (Li-MFCDI) – A proof of concept

The demand of lithium for electric vehicles and energy storage devices is increasing rapidly, thus new sources of lithium (such as seawater and natural or industrial brines), as well as sustainable methods for its recovery, will need to be explored/developed soon. This work presents a novel electromembrane process, called Lithium Membrane Flow Capacitive Deionization (Li-MFCDI), which was tested to recover lithium from a synthetic geothermal brine containing a much higher mass concentration of sodium than lithium (more than 650 times). Specifically, a ceramic lithium-selective membrane was integrated into a flow capacitive deionization (FCDI) cell, which was specifically designed, and 3D printed, to allow simultaneous charging and regeneration of the employed flow electrodes. Despite the extremely high Na+/Li+ mass ratio in the feed stream, 99.98% of the sodium was rejected and the process selectivity for lithium over other monovalent cations was 141 ± 5.85 for Li+/Na+ and 46 ± 1.46 for Li+/K+. The Li-MFCDI process exhibited a stable behaviour over a 7-day test period, and the estimated energy consumption was 16.70 ± 1.63 kWh/kg of Li+ recovered in the draw solution. These results demonstrate promising potential of the Li-MFCDI for the sustainable lithium recovery from saline streams.

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