A study on the coupling of Li+ and H3BO3 extraction and their mutual promotion mechanism

IF 8.3 1区工程技术 Q1 ENGINEERING, CHEMICAL

Desalination Pub Date : 2024-10-24 DOI:10.1016/j.desal.2024.118221

Ruzhen Zhao , Manxing Huo , Qifeng Wei , Xiulian Ren , Yongming Zhu

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Abstract

Efficient extraction of lithium and boron resources from salt-lakes is a prominent topic of research among scholars. In this study, a process route for the simultaneous extraction of lithium and boric acid was employed, followed by their separation through stepwise stripping. During the experiments, a coupling effect in the extraction of Li⁺ and H₃BO₃ was found, leading to an in-depth investigation of their mutual promotion mechanisms. Three significant patterns have been clearly verified through experiments, molecular dynamics simulations and quantum chemical calculations: First, the acidic extractant N221 can not only extract Li⁺, but also enhance the extraction of H₃BO₃; Second, mono-fatty alcohol R-OH as dilute can effectively extract H₃BO₃ while also promoting the extraction of Li⁺. Lastly, Li⁺ and H₃BO₃ can mutually promote each other's extraction. Using the Qinghai old brine, N221 system achieved a 99 % extraction efficiency for H₃BO₃, with an initial lithium extraction of 97 %, around 80 % in subsequent rounds. This paper proposes an effective method for the extraction of Li⁺ and boric acid, and thoroughly studied the mechanism of their mutual promotion of extraction. This research offers new insights into the comprehensive utilization of salt-lake resources.

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萃取 Li+ 和 H3BO3 的耦合及其相互促进机理研究

从盐湖中高效提取锂和硼资源是学者们研究的一个重要课题。本研究采用了同时萃取锂和硼酸的工艺路线，然后通过分步汽提进行分离。在实验过程中，发现了 Li+ 和 H3BO3 在萃取过程中的耦合效应，从而对它们的相互促进机理进行了深入研究。通过实验、分子动力学模拟和量子化学计算，明确验证了三个重要规律：首先，酸性萃取剂 N221 不仅能萃取 Li+，还能促进 H3BO3 的萃取；其次，稀释的单脂肪醇 R-OH 在有效萃取 H3BO3 的同时，还能促进 Li+ 的萃取。最后，Li+ 和 H3BO3 可以相互促进萃取。利用青海老卤水，N221 系统对 H3BO3 的萃取效率达到 99%，初始锂萃取率为 97%，后续萃取率约为 80%。本文提出了一种有效的萃取 Li+ 和硼酸的方法，并深入研究了它们相互促进萃取的机理。该研究为盐湖资源的综合利用提供了新的思路。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Desalination 工程技术-工程：化工

CiteScore

14.60

自引率

20.20%

发文量

619

审稿时长

41 days

期刊介绍： Desalination is a scholarly journal that focuses on the field of desalination materials, processes, and associated technologies. It encompasses a wide range of disciplines and aims to publish exceptional papers in this area. The journal invites submissions that explicitly revolve around water desalting and its applications to various sources such as seawater, groundwater, and wastewater. It particularly encourages research on diverse desalination methods including thermal, membrane, sorption, and hybrid processes. By providing a platform for innovative studies, Desalination aims to advance the understanding and development of desalination technologies, promoting sustainable solutions for water scarcity challenges.