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Preliminary study on recovering lithium chloride from lithium-containing waters by nanofiltration

机译：纳滤法从含锂水中回收氯化锂的初步研究

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摘要

Process assessment experiment was carried out to investigate the applicability of nanofiltration (NF)for recovering lithium chloride from lithium-containing waters.A Desal-5 DL membrane element was adopted to treat diluted bittern containing lithium chloride and large concentrations of magnesium,boron and sulfate.The mass transfer and separating mechanism of the process were discussed qualitatively.It was suggested that ionic fractionations were governed by the combination of Donnan exclusion,dielectric exclusion and steric hindrance.At higher concentrations,steric hindrance became remarkable due to the formation of ion pairs,ion clusters and molecules.Experimental results showed that the DL membrane exhibited satisfactory rejection of sulfate and moderate rejection of magnesium but poor rejection of boron.For recovering lithium,DL performed economically poorly compared to electrodialysis.
机译：进行了工艺评估实验，以研究纳滤（NF）在含锂水中回收氯化锂的适用性。采用Desal-5 DL膜元件处理含氯化锂和高浓度镁，硼和硫酸盐的稀卤水。定性地讨论了该过程的传质和分离机理。研究表明，离子分离是由Donnan排斥，介电排斥和位阻共同控制的。在较高浓度下，由于离子对的形成，位阻变得显着。实验结果表明，DL膜对硫酸盐的排阻令人满意，对镁的排阻适中，但对硼的排阻却很差。与电渗析相比，DL在回收锂方面的经济性较差。

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