化工学报 ›› 2023, Vol. 74 ›› Issue (5): 2022-2033.DOI: 10.11949/0438-1157.20230303

• 分离工程 • 上一篇    下一篇

蛇形流场电控离子交换装置用于选择性提锂

张正1(), 何永平2, 孙海东2, 张荣子2, 孙正平2, 陈金兰2, 郑一璇1, 杜晓1(), 郝晓刚1()   

  1. 1.太原理工大学化学工程与技术学院,山西 太原 030024
    2.青海盐湖工业股份有限公司中央研究院,青海 格尔木 816000
  • 收稿日期:2023-03-28 修回日期:2023-05-09 出版日期:2023-05-05 发布日期:2023-06-29
  • 通讯作者: 杜晓,郝晓刚
  • 作者简介:张正(1993—),男,博士研究生,zzhangtyut@163.com
  • 基金资助:
    国家重点研发计划政府间国际科技创新合作重点专项项目(2017YFE0129200);国家自然科学基金项目(U21A20303)

Electrochemically switched ion exchange device with serpentine flow field for selective extraction of lithium

Zheng ZHANG1(), Yongping HE2, Haidong SUN2, Rongzi ZHANG2, Zhengping SUN2, Jinlan CHEN2, Yixuan ZHENG1, Xiao DU1(), Xiaogang HAO1()   

  1. 1.College of Chemical Engineering and Technology, Taiyuan University of Technology, Taiyuan 030024, Shanxi, China
    2.Academia Sinica, Qinghai Salt Lake Industry Group Company Limited, Geermu 816000, Qianghai, China
  • Received:2023-03-28 Revised:2023-05-09 Online:2023-05-05 Published:2023-06-29
  • Contact: Xiao DU, Xiaogang HAO

摘要:

通过交替、对称地堆叠带孔的锰酸锂(LiMn2O4)基膜电极和导电炭黑(C)基膜电极,组装了单通道的蛇形流场电控离子交换(ESIX)装置,并将其用于从高镁锂比模拟卤水(Mg/Li约500)中选择性提取锂离子。基于这种自下而上的蛇形流场,增加膜组件中腔室的数量可以使模拟卤水中更多的锂离子被捕获。相较于常规的恒电压驱动模式,恒电流-恒电压耦合驱动模式能有效地提升ESIX装置的提锂性能。在0.8 mA·cm-2-1 V的耦合驱动模式下,该装置在120 min内对锂离子的提取率高达97.6%。此外,X射线衍射(XRD)证明,通过冲洗膜电极表面可以去除大部分吸附的镁离子。因此,这种新型的ESIX装置具有从高镁锂比盐湖卤水中选择性分离锂离子的工业应用潜力。

关键词: 电化学, 蛇形流场, 锂离子提取, 盐湖卤水, 选择性, 分离

Abstract:

An electrochemically switched ion exchange (ESIX) device with single-channel serpentine flow field was assembled by alternately and symmetrically stacking perforated LiMn2O4-based and carbon black (C)-based film coated electrodes, and employed for selective extraction of lithium from simulated brine with high Mg/Li ratio (about 500). Based on this bottom-up serpentine flow field, increasing the number of chambers in the membrane module can enable more lithium ions to be trapped in the simulated brine. Compared with the conventional driving mode of constant voltage, the collaborative driving mode of constant current-constant voltage could effectively improve the lithium extraction performance of the ESIX device. The extraction efficiency of Li+ reached as high as 97.6% in 120 min with a coupled driving mode of 0.8 mA·cm-2-1 V. In addition, X-ray diffraction (XRD) test demonstrated that most of the adsorbed Mg2+ could be removed by rinsing the surface of the film coated electrodes. Therefore, such a novel ESIX device has potential industrial applications for selective separation of lithium from high Mg/Li ratio salt lake brines.

Key words: electrochemistry, serpentine flow field, lithium extraction, salt lake brine, selectivity, separation

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