Direct lithium extraction from α-spodumene ore via alkali leaching-Li/Al co-precipitation method

IF 9 1区工程技术 Q1 ENGINEERING, CHEMICAL

Separation and Purification Technology Pub Date : 2025-04-26 DOI:10.1016/j.seppur.2025.133199

Chang Peng , Chaoran Zhai , Yandong Liu , Lihua He , Xuheng Liu

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引用次数: 0

Abstract

The development of the global energy industry has led to a surge in demand for lithium resources, prompted growing attention to low-cost lithium extraction methods from lithium mines. A direct alkali decomposition method for lithium extraction from spodumene is proposed. This approach bypasses the conventional roasting activation step, leveraging the intrinsic properties of spodumene as an aluminosilicate. Following leaching, lithium is selectively separated from the solution via Li/Al co-precipitation. Under optimal experimental conditions, the lithium extraction efficiency reached 98.4 %, with the slag primarily coexisted in the phases of grossular (Ca₃Al₂Si₃O₁₂) and sodium calcium hydrogen silicate (NaCaHSiO₄) after the leaching process. Bayerite (Al(OH)₃) was synthesized and used as a seed crystal for lithium separation and enrichment from high-alkali, high-aluminum solutions. This significantly shortened the induction time for Li/Al co-precipitation products. A lithium precipitation efficiency of 98.8 % was achieved, with lithium being recovered from the leaching solution as Lithium-Aluminum hydroxide hydrate (LiAl₂(OH)₇·xH₂O). Additionally, 96.5 % of lithium was recovered from the coprecipitate through water-leaching, with the desorbed precipitate transforming into Al(OH)₃, which can be used as a seed crystal or a raw material for alumina production.

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碱浸-锂铝共沉淀法从α-锂辉石矿石中直接提锂

全球能源工业的发展导致对锂资源的需求激增，促使人们越来越关注从锂矿中提取低成本锂的方法。本文提出了一种直接碱分解法，用于从锂辉石中提取锂。这种方法绕过了传统的焙烧活化步骤，利用了正长岩作为铝硅酸盐的固有特性。浸出后，通过锂/铝共沉淀从溶液中选择性地分离出锂。在最佳实验条件下，锂的萃取效率达到 98.4%，浸出过程后矿渣主要共存于毛玻璃（Ca3Al2Si3O12）和硅酸氢钙钠（NaCaHSiO4）相中。贝叶石（Al(OH)3）被合成并用作从高碱高铝溶液中分离和富集锂的籽晶。这大大缩短了锂/铝共沉淀产物的诱导时间。锂沉淀效率达到 98.8%，锂以氢氧化锂铝水合物（LiAl2(OH)7-xH2O）的形式从浸出液中回收。此外，通过水浸法还从共沉淀中回收了 96.5% 的锂，解吸沉淀转化为 Al(OH)3，可用作籽晶或氧化铝生产的原料。

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

Separation and Purification Technology 工程技术-工程：化工

CiteScore

14.00

自引率

12.80%

发文量

2347

审稿时长

43 days

期刊介绍： Separation and Purification Technology is a premier journal committed to sharing innovative methods for separation and purification in chemical and environmental engineering, encompassing both homogeneous solutions and heterogeneous mixtures. Our scope includes the separation and/or purification of liquids, vapors, and gases, as well as carbon capture and separation techniques. However, it's important to note that methods solely intended for analytical purposes are not within the scope of the journal. Additionally, disciplines such as soil science, polymer science, and metallurgy fall outside the purview of Separation and Purification Technology. Join us in advancing the field of separation and purification methods for sustainable solutions in chemical and environmental engineering.