Abstract Boron removal from lithium-rich brine was systematically investigated by solvent extraction using 2,2,4-trimethyl-1,3-pentanediol (TMPD) dissolved in 2-ethylhexanol and sulfonated kerosene. The extraction parameters were determined, including the concentration of mixed alcohols, lithium and solvents loss. During the extraction, a single TMPD molecule reacted with a single boric acid molecule to form a complex with two C–O–B ester bonds. The mechanism was also verified using density functional theory (DFT). The overall extraction efficiency reached 99.95% by a two-stage countercurrent extraction. NaOH (0.2 mol/L) with an O/A phase ratio of 1:2 was used to strip the loaded organic phase with 99.99% stripping efficiency. The feasible industrial application of this boron extraction method was validated.

中文翻译：

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使用混合醇从富锂卤水中提取硼

摘要 使用溶解在 2-乙基己醇和磺化煤油中的 2,2,4-三甲基-1,3-戊二醇 (TMPD)，通过溶剂萃取系统地研究了从富锂盐水中去除硼。确定了提取参数，包括混合醇的浓度、锂和溶剂损失。在提取过程中，单个 TMPD 分子与单个硼酸分子反应形成具有两个 C-O-B 酯键的复合物。还使用密度泛函理论 (DFT) 验证了该机制。两级逆流萃取总萃取效率达99.95%。O/A 相比为 1:2 的 NaOH (0.2 mol/L) 用于汽提负载的有机相，汽提效率为 99.99%。验证了该硼提取方法在工业上的可行性。