Echelon extraction of valuable components from salt lake brine substrate

IF 8.3 1区工程技术 Q1 ENGINEERING, CHEMICAL

Desalination Pub Date : 2024-11-17 DOI:10.1016/j.desal.2024.118307

Xiangting Tang , Jun Chen , Ye Zhang , Jianguo Yu , Sen Lin

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Abstract

Salt fields are indispensable for the salt lake industry, yet their substrates, which are rich in valuable resources accumulated over time by the formation of solid solution enrichment, always stand at a neglected position. In this study, the distribution and occurrence state of elements in the Mahai Salt Lake substrate were comprehensively investigated by multiple characterizations. The substrate was primarily found to consist of calcium-silica‑aluminum minerals, with significant concentrations of lithium (0.0053 %), strontium (0.1130 %), and rubidium (0.0266 %) adsorbed onto these mineralized phases. Besides, an echelon extraction was developed to exploit these valuable resources including hydrochloric acid leaching and segmented calcination-leaching coupled process. It was confirmed that over 95 % of rubidium and 93 % of strontium could be effectively extracted via hydrochloric acid leaching through cation exchange mechanisms. 80 % lithium was extracted by calcination-leaching coupled process with three cycles to conquer the interlayer structure of mineralized lithium, facilitating the occupation of Li⁺ lattice sites by H⁺.

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从盐湖卤水基质中梯级提取有价值成分

盐田是盐湖工业不可或缺的重要组成部分，然而盐田基质因长期形成固溶体富集而积累了丰富的宝贵资源，却始终处于被忽视的地位。本研究通过多种表征方法，全面考察了马海盐湖基质中元素的分布和存在状态。研究发现，基质主要由钙硅铝矿物组成，这些矿化相中吸附了大量的锂（0.0053 %）、锶（0.1130 %）和铷（0.0266 %）。此外，还开发了一种梯级萃取法来开采这些宝贵的资源，包括盐酸浸出和分段煅烧-浸出耦合工艺。研究证实，通过阳离子交换机制，盐酸浸出法可有效提取 95% 以上的铷和 93% 的锶。通过三次循环的煅烧-浸出耦合工艺提取了 80% 的锂，征服了矿化锂的层间结构，促进了 H+ 对 Li+ 晶格位点的占据。

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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.