| 纳滤分离铝锂过程研究 |
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| 引用本文： | 高琳,王怀有,赵有璟,王敏.纳滤分离铝锂过程研究[J].盐湖研究,2020,28(2). |
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| 作者姓名： | 高琳 王怀有 赵有璟 王敏 |
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| 作者单位： | ;1.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;2.青海省盐湖资源化学重点实验室;3.中国科学院大学 |
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| 基金项目： | 国家重点研发计划（2018YFC0604804）；国家自然科学基金委-柴达木盐湖化工科学研究联合基金（U1707603，U1507202）；青海省重大科技专项（ 2019-GX-A7） |
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| 摘 要： | 本文探讨了纳滤分离Al~(3+)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Al~(3+)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Al~(3+)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,Al~(3+)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。
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| 关 键 词： | 纳滤 铝分离 提锂 Zeta电位 锂云母浸出液 |
| 收稿时间： | 2019/12/13 0:00:00 |
| 修稿时间： | 2019/12/27 0:00:00 |
Study on the Separation Process of Aluminum and Lithium by Nanofiltration |
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| Gao Lin,Wang Huaiyou,Zhao Youjing and Wang Min.Study on the Separation Process of Aluminum and Lithium by Nanofiltration[J].Journal of Salt Lake Research,2020,28(2). |
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| Authors: | Gao Lin Wang Huaiyou Zhao Youjing and Wang Min |
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| Institution: | Qinghai Institute of Salt Lakes, Chinese Academy of Sciences,Qinghai Institute of Salt Lakes, Chinese Academy of Sciences,Qinghai Institute of Salt Lakes, Chinese Academy of Sciences,Qinghai Institute of Salt Lakes, Chinese Academy of Sciences |
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| Abstract: | 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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| Keywords: | Nanofiltration Aluminium separation Lithium recovery Zeta potential Lepidolite leaching solution |
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