化工学报 ›› 2023, Vol. 74 ›› Issue (6): 2477-2485.DOI: 10.11949/0438-1157.20230403

• 分离工程 • 上一篇    下一篇

选择性电渗析镁锂分离过程模拟优化

朱兴驰1,2(), 郭志远1,2, 纪志永1,2(), 汪婧1,2, 张盼盼1,2, 刘杰1,2, 赵颖颖1,2, 袁俊生1,2   

  1. 1.河北工业大学化工学院/海水资源高效利用化工技术教育部工程硏究中心,天津 300130
    2.河北省现代海洋化工技术协同创新中心,天津 300130
  • 收稿日期:2023-04-26 修回日期:2023-06-06 出版日期:2023-06-05 发布日期:2023-07-27
  • 通讯作者: 纪志永
  • 作者简介:朱兴驰(1997—),男,硕士研究生,1345367322@qq.com
  • 基金资助:
    国家自然科学基金项目(21978064);河北省自然科学基金项目(B2022202024)

Simulation and optimization of selective electrodialysis magnesium and lithium separation process

Xingchi ZHU1,2(), Zhiyuan GUO1,2, Zhiyong JI1,2(), Jing WANG1,2, Panpan ZHANG1,2, Jie LIU1,2, Yingying ZHAO1,2, Junsheng YUAN1,2   

  1. 1.Engineering Research Center of Seawater Utilization Technology of Ministry of Education, School of Chemical Engineering, Hebei University of Technology, Tianjin 300130, China
    2.Hebei Collaborative Innovation Center of Modern Marine Chemical Technology, Tianjin 300130, China
  • Received:2023-04-26 Revised:2023-06-06 Online:2023-06-05 Published:2023-07-27
  • Contact: Zhiyong JI

摘要:

选择性电渗析(selective electrodialysis,S-ED)技术是目前实现高镁锂比卤水锂资源提取的有效手段。通过建立一种二维传质稳态模型,以离子通量分布为研究对象,探究体系离子强度、外加电压和通道流速对镁锂分离的影响。结果表明:体系离子强度和通道流速的增大与外加电压的减小均对镁锂分离具有促进作用。在体系离子强度为1378 mol/m3,外加电压值为0.8 V,通道流速为5.7 cm/s的条件下,锂镁分离系数为2.31。研究结果可为推广S-ED过程数值模拟提供理论指导和数据参考。

关键词: 锂资源, 镁锂分离, 选择性电渗析, 数值模拟

Abstract:

Selective electrodialysis (S-ED) technology is an effective means to extract lithium resources from brine with high magnesium lithium ratio. A two-dimensional mass transfer steady state model was established to investigate the effects of ionic strength, applied voltage and channel flow rate on the separation of magnesium and lithium with the ion flux distribution as the research object. The results show that the increase of ionic strength and channel flow rate and the decrease of applied voltage can both promote the separation of magnesium and lithium. Under the condition that the ionic strength of the system is 1378 mol/m3, the applied voltage is 0.8 V, and the channel flow rate is 5.7 cm/s, the separation coefficient of lithium and magnesium is 2.31. The research results can provide theoretical guidance and data reference for the promotion of numerical simulation of S-ED processes.

Key words: lithium resources, magnesium lithium separation, selective electrodialysis, numerical simulation

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