Highly Selective and Green Recovery of Lithium from Coal Gangue Using Recyclable Ammonium Fluoride Leaching System

IF 2.1 4区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

JOM Pub Date : 2024-12-09 DOI:10.1007/s11837-024-06987-4

Yu Xie, Zhengwei Han, Afsar Khan, Yuting Liang, Hui Zhong, Zhiguo He

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引用次数: 0

Abstract

With the discovery of super-enriched lithium (Li) in coal, coal-based Li deposit is a promising resource to meet Li demand. However, traditional Li extraction methods are mainly through acid leaching, which complicates the subsequent purification process. Herein, a method of selective lithium leaching employing recyclable ammonium fluoride (NH₄F) was proposed. The influences of roasting temperature and leaching conditions were explored in detail. Under the optimal conditions, the Li leaching rate reaches 81.42%, while Fe, Al, Mg, Ca and Na are < 3%. Besides, NH₄F could be generated and sent back into the leaching process. The roasting and leaching mechanisms assumed that kaolinite is transformed into metakaolinite after roasting. The Al-containing lattice structure is destroyed, and the Li residing in it is also released and becomes soluble Li, while other metal elements stay. This study provides a highly selective and green Li extraction process from coal-based Li deposits.

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可循环氟化铵浸出系统高选择性绿色回收煤矸石中的锂

随着煤中超富集锂的发现，煤基锂矿床是满足锂需求的有前景的资源。然而，传统的锂提取方法主要是通过酸浸，这使得后续的提纯过程变得复杂。提出了一种利用可回收氟化铵（NH4F）选择性浸出锂的方法。详细探讨了焙烧温度和浸出条件的影响。在最佳浸出条件下，Li浸出率达到81.42%，Fe、Al、Mg、Ca、Na浸出率为3%。此外，NH4F还会产生并返回到浸出过程中。焙烧浸出机理假设高岭石经焙烧后转化为偏高岭石。含al的晶格结构被破坏，其中的Li也被释放，变成可溶的Li，而其他金属元素则保留下来。本研究提供了一种高选择性、绿色的煤基锂提取工艺。

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

JOM 工程技术-材料科学：综合

CiteScore

4.50

自引率

3.80%

发文量

540

审稿时长

2.8 months

期刊介绍： JOM is a technical journal devoted to exploring the many aspects of materials science and engineering. JOM reports scholarly work that explores the state-of-the-art processing, fabrication, design, and application of metals, ceramics, plastics, composites, and other materials. In pursuing this goal, JOM strives to balance the interests of the laboratory and the marketplace by reporting academic, industrial, and government-sponsored work from around the world.