Efficient Extraction of Lithium Ions from High Mg/Li Ratio Brine through the Synergy of TBP and Hydroxyl Functional Ionic Liquids,Chinese Journal of Chemistry

当前位置： X-MOL 学术 › Chin. J. Chem. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Efficient Extraction of Lithium Ions from High Mg/Li Ratio Brine through the Synergy of TBP and Hydroxyl Functional Ionic Liquids
Chinese Journal of Chemistry ( IF 5.5 ) Pub Date : 2020-06-15 , DOI: 10.1002/cjoc.202000210
Ruibing Bai _{1,

2} , Junfeng Wang ₁ , Li Cui ₃ , Shicheng Yang ₁ , Wei Qian ₁ , Penglei Cui ₁ , Yanqiang Zhang _{1,

4}

Affiliation

The extraction of Li⁺ from the high Mg/Li ratio brine was performed using hydroxyl functional ionic liquids (ILs) as the coextractant and tributyl phosphate (TBP) as the extractant. Firstly, the extractive system, 1‐(2‐hydroxyethyl)‐3‐methylimidazolium bis(trifluoromethylsulfonyl)imide ([HOEmim][NTf₂]) + TBP was proved to exhibit the highest extraction efficiency of Li⁺ (88.15%) from LiCl aqueous solutions among the extractants composed of different ILs, TBP, and ILs + TBP. Effects of various extraction parameters on the extraction efficiencies of Li⁺ and Mg²⁺ were then investigated. 95.01% of Li⁺ was extracted and the Li/Mg separation factor reached 405.76 in a single‐stage at 278.15 K and O/A of 2 : 1. The extraction complexes were determined by the slope analysis method and ESI‐MS analysis, and the metal complexes in the organic phase were indicated to be mainly [Li·2TBP][NTf₂]. The striping study showed that 92.86% of Li⁺ was stripped with 1.0 mol·L^–1 HCl. 98% extraction capacity of the synergy extractants was remained after 5 regeneration cycles. The thermodynamic parameters (ΔG°, ΔH°, and ΔS°), together with the mechanism of the Li⁺ extraction were further demonstrated finally. According to the results, [HOEmim][NTf₂] + TBP extraction system showed promising performance in extracting lithium from salt lake brine with high Mg/Li ratio.

中文翻译：

通过TBP和羟基官能离子液体的协同作用从高Mg / Li比盐水中高效提取锂离子

使用羟基官能离子液体（ILs）作为共萃取剂和磷酸三丁酯（TBP）作为萃取剂，从高Mg / Li比盐水中萃取Li ⁺。首先，萃取系统1-（2-羟乙基）-3-甲基咪唑双（三氟甲基磺酰基）酰亚胺（[HOEmim] [NTf ₂ ]）+ TBP被证明具有最高的Li ⁺（88.15％）萃取效率。提取液中的水溶液由不同的IL，TBP和IL + TBP组成。然后研究了各种萃取参数对Li ⁺和Mg ²⁺萃取效率的影响。锂⁺ 95.01％在278.15 K和2的O / A为2的单级萃取中，Li / Mg的分离系数达到405.76。通过斜率分析法和ESI-MS分析确定了萃取配合物，并进行了分析。有机相主要为[Li·2TBP] [NTf ₂ ]。汽提研究表明，Li ^+的92.86％被1.0mol·L ^–1 HCl汽提。5个再生循环后，仍保留了98％的协同提取剂提取能力。最后进一步说明了热力学参数（ΔG °，ΔH °和ΔS °）以及Li ⁺萃取的机理。根据结果，[HOEmim] [NTf ₂] + TBP萃取系统显示出从高Mg / Li比的盐湖盐水中萃取锂的良好前景。

更新日期：2020-06-15

点击分享查看原文

点击收藏

阅读更多本刊新发论文本刊介绍/投稿指南