| 纳滤法用于铝锂分离的初步研究 |
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| 引用本文： | 高琳,王怀有,赵有璟,王敏.纳滤法用于铝锂分离的初步研究[J].盐湖研究,2020,28(2):79-90. |
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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： | 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 |
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| 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。
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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： | 2019/12/12 0:00:00 |
Study on the Separation Process of Aluminum and Lithium by Nanofiltration |
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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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