Stepwise recovery of gallium (Ga), lithium (Li), and rare earth elements (REEs) from roasted coal gangue based on leaching kinetics differentiation

IF 4.8 2区材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING

Hydrometallurgy Pub Date : 2025-06-24 DOI:10.1016/j.hydromet.2025.106525

Jingzheng Wang , Hongxiang Xu , Yijun Cao , Kejia Ning , Biao Fu , Lin Ma , Xin Sun , Yuntao Kang , Mengting Hong , Guixia Fan , Xiahui Gui , Jiushuai Deng

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引用次数: 0

Abstract

Coal resources are a potential source of strategic metals. This study explores the leaching characteristics and mechanisms for extracting gallium (Ga), lithium (Li), and rare earth elements (REEs) from coal gangue under roasting and acid leaching conditions. Based on the differences in their leaching characteristics, a stepwise leaching strategy is proposed for efficient separation and recovery. Gallium and lithium are primarily associated with silicate minerals, while rare earth elements exist as independent rare earth minerals. Roasting at 600 °C enhances chemical reactivity, increasing the specific surface area and pore volume of the sample, thereby improving the leaching efficiency of Ga, Li, and REEs. The leaching of Ga and Li is mainly controlled by chemical reactions and is highly temperature-dependent, while the leaching of REEs follows a mixed control model. The stepwise extraction strategy involves leaching at 50 °C for 15 min to recover approximately 80 % of the REEs, with minimal loss of Ga and Li (∼7 %), followed by further leaching at 90 °C for 180 min to recover the remaining Ga and Li. This process demonstrates the potential of the stepwise extraction strategy for the efficient separation and recovery of these elements.

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基于浸出动力学分异的焙烧煤矸石中镓（Ga）、锂（Li）和稀土元素（REEs）的分步回收

煤炭资源是战略金属的潜在来源。研究了在焙烧和酸浸条件下从煤矸石中提取镓（Ga）、锂（Li）和稀土元素（ree）的浸出特征和机理。根据其浸出特性的差异，提出了一种分步浸出策略，以实现有效的分离和回收。镓和锂主要与硅酸盐矿物伴生，而稀土元素作为独立的稀土矿物存在。600℃焙烧提高了化学反应性，增加了样品的比表面积和孔体积，从而提高了Ga、Li和ree的浸出效率。Ga和Li的浸出主要受化学反应控制，且高度依赖于温度，而稀土的浸出则遵循混合控制模式。分步提取策略包括在50°C下浸出15分钟，以回收约80%的稀土，Ga和Li的损失最小（~ 7%），然后在90°C下进一步浸出180分钟，以回收剩余的Ga和Li。这一过程证明了逐步萃取策略对这些元素的有效分离和回收的潜力。

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

Hydrometallurgy 工程技术-冶金工程

CiteScore

9.50

自引率

6.40%

发文量

144

审稿时长

3.4 months

期刊介绍： Hydrometallurgy aims to compile studies on novel processes, process design, chemistry, modelling, control, economics and interfaces between unit operations, and to provide a forum for discussions on case histories and operational difficulties. Topics covered include: leaching of metal values by chemical reagents or bacterial action at ambient or elevated pressures and temperatures; separation of solids from leach liquors; removal of impurities and recovery of metal values by precipitation, ion exchange, solvent extraction, gaseous reduction, cementation, electro-winning and electro-refining; pre-treatment of ores by roasting or chemical treatments such as halogenation or reduction; recycling of reagents and treatment of effluents.