纳滤法用于铝锂分离的初步研究

高琳; 王怀有; 赵有璟; 王敏

纳滤法用于铝锂分离的初步研究

Study on the Separation Process of Aluminum and Lithium by Nanofiltration

投稿时间：2019-12-12

DOI：10.12119/j.yhyj.202002010

中文关键词: 纳滤铝分离提锂 Zeta电位锂云母浸出液

英文关键词:Nanofiltration Aluminium separation Lithium recovery Zeta potential Lepidolite leaching solution

基金项目:

作者	单位
高琳	中国科学院青海盐湖研究所,中国科学院盐湖资源综合高效利用重点实验室,青海西宁 810008 青海省盐湖资源化学重点实验室,青海西宁 810008 中国科学院大学,北京 101408
王怀有	中国科学院青海盐湖研究所,中国科学院盐湖资源综合高效利用重点实验室,青海西宁 810008 青海省盐湖资源化学重点实验室,青海西宁 810008
赵有璟	中国科学院青海盐湖研究所,中国科学院盐湖资源综合高效利用重点实验室,青海西宁 810008 青海省盐湖资源化学重点实验室,青海西宁 810008
王敏	中国科学院青海盐湖研究所,中国科学院盐湖资源综合高效利用重点实验室,青海西宁 810008 青海省盐湖资源化学重点实验室,青海西宁 810008

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中文摘要:

本文探讨了纳滤分离Al³⁺和Li⁺的可行性,研究了含盐量和铝锂比对分离效率的影响,提出了从锂云母浸出液中分离回收锂的新方法。实验结果表明,纳滤膜对Al³⁺和Li⁺的截留率随含盐量的升高而降低,其中Li⁺始终呈现负浓度梯度扩散的趋势,而Al³⁺的截留率始终稳定在99%以上。当含盐量为45 g/L时,铝锂分离因子最高可达248.33,膜面相应Zeta电位的绝对值达到最大。随着溶液中铝锂比的变化,Al³⁺和Li⁺的截留率分别在不同铝锂比的条件下出现拐点,溶液的pH呈现先下降后上升最后下降的复杂趋势。本实验研究发现,DK膜能够在酸性环境下实现高效的铝锂分离和锂的浓缩,从而为锂云母浸出液中锂的提取提供新的思路。

英文摘要:

This paper concerns the feasibility of nanofiltration separation of Al³⁺ and Li⁺, and a new method for separating and recovering lithium from lepidolite leaching solution was proposed. Factors like salinity and mass ratio of Al³⁺/Li⁺ were developed during the separation. The investigation on salinity indicated that the retention rate of Al³⁺ and Li⁺ decreases with incremental salinity. Li⁺ invariably exhibits a negative concentration gradient diffusion and the retention rate of Al³⁺ can be stabilized above 99%. Separation factor of Al³⁺/Li⁺ has arrived 248.333 at the salinity is 45 g/L, and the corresponding zeta potential on the membrane also reaches a maximum value. In the experiments with different Al³⁺/Li+ mass ratios, inflection points has appeared in the retention rate of Al³⁺ and Li⁺ at different ratios . The pH of solution appeared to decrease first, then increase and finally decrease. Overall, this paper has found that DK membrane has a high rejection rate of aluminum and a relatively good separation efficiency and provided a novel vision for future separation of lithium and aluminum from lepidolite leaching solution.

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