东北大学学报（自然科学版）

东北大学学报:自然科学版 ›› 2019, Vol. 40 ›› Issue (2): 224-228.DOI: 10.12068/j.issn.1005-3026.2019.02.014

• 材料与冶金 • 上一篇    下一篇

浓度差对电解直接制备碳酸锂过程的影响

潘喜娟， 张廷安， 豆志河， 韩秀秀   

  1. (东北大学 多金属共生矿生态化冶金教育部重点实验室， 辽宁 沈阳110819)
  • 收稿日期:2017-12-13 修回日期:2017-12-13 出版日期:2019-02-15 发布日期:2019-02-12
  • 通讯作者: 潘喜娟
  • 作者简介:潘喜娟(1990-)，女，山东烟台人，东北大学博士研究生； 张廷安(1960-)，男，河南周口人，东北大学教授，博士生导师； 豆志河(1978-)，男，河南周口人，东北大学教授，博士生导师.
  • 基金资助:
    国家自然科学基金资助项目(U1508217，U1710257)；中央高校基本科研业务费专项资金资助项目(N162505002).

Influence of Concentration Difference on Electrolysis Process of Li2CO3 Direct Preparation

PAN Xi-juan， ZHANG Ting-an， DOU Zhi-he， HAN Xiu-xiu   

  1. Key Laboratory for Ecological Metallurgy of Multimetal Mineral
  • Received:2017-12-13 Revised:2017-12-13 Online:2019-02-15 Published:2019-02-12
  • Contact: ZHANG Ting-an
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摘要： 研究了阳极液质量浓度为300g/L的条件下，阴极液的质量浓度分别为50，100，200，300，400g/L时，电解过程中阴极液pH和温度的不同变化以及不同Li2CO3产物的相组成和微观形态.实验结果表明:电解过程中的反应机理并不受浓度或浓度差的影响，但浓度差对反应进行的速率和限度存在较大影响;电解产物产量和电流效率随着浓度差减小或阴极液浓度升高而增大;电解得到的Li2CO3晶体为单斜晶系，浓度差使Li2CO3产品结晶程度升高，晶粒更细小.综合考虑，阴极液LiCl质量浓度为100g/L，即阳极液与阴极液质量浓度差为200g/L是较优的电解参数.

关键词: 氯化锂, 电解, 碳酸锂, 浓度差, 离子交换膜

Abstract: The variations of cathode liquid pH and temperature and the phase composition and microstructure of Li2CO3 products were studied during the electrolytic process when the anolyte concentration was 300g/L and catholyte concentration were 50， 100， 200， 300 and 400g/L， respectively. The results show that the concentration or concentration difference has little effect on the reaction mechanism in the electrolysis process， while the concentration difference has a great influence on the speed and the limit of the reaction. The amount of Li2CO3 products and current efficiency increase with the decrease of the concentration difference or concentration of catholyte. The crystallography of Li2CO3 produced from electrolysis is monoclinic. Moreover， the concentration difference not only increases the crystallization degree of Li2CO3 products but also refines the grains. The optimal catholyte concentration of LiCl as the electrolytic parameter is 100g/L， ie， the concentration difference between anode and cathode liquid is 200g/L.

Key words: lithium chloride, electrolysis, lithium carbonate, concentration difference, ion-exchange membrane

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