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首页> 外文期刊>Separation and Purification Technology >Lithium recovery from Li3PO4 leaching liquor: Solvent extraction mechanism of saponified D2EHPA system
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Lithium recovery from Li3PO4 leaching liquor: Solvent extraction mechanism of saponified D2EHPA system

机译：Li3PO4浸出液中的锂恢复：皂化D2ehpa系统的溶剂萃取机制

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摘要

Recovery of low-concentration lithium resources by Li3PO4 precipitation is an effective method and using saponified D2EHPA-kerosene is a promising method for the treatment of Li3PO4. In this paper, the effects of additives on the extraction of lithium from Li3PO4 leaching liquor and the mechanism of lithium extraction by saponified D2EHPA were investigated. The results showed that the addition of tributyl phosphate (TBP) could promote lithium stripping. Experiments confirmed that lithium in solution could be extracted by one-to-one cation exchange with sodium in the organic phase. Slope analysis showed that LiR center dot NaR was formed when lithium was extracted by saponified D2EHPA, and LiR center dot NaR center dot 0.1TBP was formed when adding TBP (R is D2EHPA anion). Infrared spectroscopy indicated that the addition of TBP or the saponification of the organic phase depolymerized the D2EHPA dimer. Adding TBP improved lithium's stripping ratio and the concentration of lithium in the stripping solution, which are favorable to the subsequent Li2CO3 precipitation process. This paper provides a deeper understanding of the conversion of lithium phosphate to lithium carbonate using a saponified D2EHPA system.
机译：通过Li3PO4沉淀回收低浓度锂资源是一种有效的方法，使用皂化的D2ehpa-煤油是一种治疗Li3PO4的有希望的方法。本文研究了添加剂对Li3PO4浸出液溶液提取的影响及皂化D2ehpa的锂萃取机理。结果表明，添加磷酸三丁基酯（TBP）可以促进锂汽提。实验证实，溶液中的锂可以通过在有机相中用一对一的阳离子交换提取。斜率分析表明，当通过皂化的D2ehPa提取锂时形成Lir中心点NAR，当添加TBP时形成LIR中心点NAR中心点0.1TBP（R是D2EHPA阴离子）。红外光谱表明，加入Tbp或有机相的皂化剂解聚的D2ehpa二聚体。在汽提溶液中添加TBP改善的锂溶液溶液和锂的浓度，这有利于随后的Li 2 CO 3沉淀过程。本文利用皂化的D2EhPA系统对磷酸锂转化为碳酸锂的转化率更深入了解。

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