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通过使用β-二酮和Cyanex 923的协同溶剂萃取从富锂卤水中选择性去除镁以提纯锂

Selective removal of magnesium from lithium-rich brine for lithium purification by synergic solvent extraction using β-diketones and Cyanex 923.

作者信息

Li Zheng, Binnemans Koen

机构信息

Department of Chemistry KU Leuven Heverlee Flemish Brabant Belgium.

出版信息

AIChE J. 2020 Jul;66(7):e16246. doi: 10.1002/aic.16246. Epub 2020 Apr 21.

DOI:10.1002/aic.16246
PMID:35866145
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9286357/
Abstract

In the production of battery-grade and high-purity LiCO, it is essential to remove magnesium impurities. The state-of-the-art solvent extraction (SX) process using Versatic Acid 10 and D2EHPA co-extracts 3.3-5.5% lithium, while removing 86-98% magnesium. Here, we demonstrate that synergic SX systems containing a β-diketone (HPMBP, HTTA or HDBM) and Cyanex 923 are highly selective for magnesium extraction over lithium (separation factor  > 1,000). The extracted magnesium and lithium complexes have the stoichiometry of [Mg∙A∙(C923)] and [Li∙A ∙(C923)] ( = 1, 2), respectively (A represents deprotonated β-diketone). The three β-diketone synergic SX systems all considerably outperformed the Versatic Acid 10 system for magnesium removal from a synthetic solution containing 24 g L Li and 0.24 g L Mg. In a three-stage batch counter-current extraction, the HPMBP and Cyanex 923 synergic SX system removed 100% magnesium with only 0.6% co-extraction of lithium. This excellent Mg/Li separation is the best result reported so far.

摘要

在电池级高纯碳酸锂的生产过程中，去除镁杂质至关重要。目前使用Versatic Acid 10和二（2-乙基己基）磷酸（D2EHPA）的溶剂萃取（SX）工艺共萃取3.3 - 5.5%的锂，同时去除86 - 98%的镁。在此，我们证明了含有β-二酮（1-苯基-3-甲基-4-苯甲酰基吡唑啉酮-5，噻吩甲酰三氟丙酮或二苯甲酰甲烷）和Cyanex 923的协同SX体系对镁的萃取具有高度选择性，对锂的选择性较低（分离因子>1000）。萃取得到的镁和锂配合物的化学计量比分别为[Mg∙A∙(C923)]和[Li∙A ∙(C923)]（ = 1, 2）（A代表去质子化的β-二酮）。在从含有24 g L锂和0.24 g L镁的合成溶液中去除镁方面，这三种β-二酮协同SX体系均明显优于Versatic Acid 10体系。在三级间歇逆流萃取中，1-苯基-3-甲基-4-苯甲酰基吡唑啉酮-5和Cyanex 923协同SX体系去除了100%的镁，锂的共萃取率仅为0.6%。这种出色的镁/锂分离效果是迄今为止报道的最佳结果。

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