Hydrochloric acid leaching of rare earth elements from a novel source of deep-sea sediments and advantage of reduction with H2O2

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

Hydrometallurgy Pub Date : 2024-08-22 DOI:10.1016/j.hydromet.2024.106383

Kuifang Zhang , Zhiqiang Liu , Hui Liu , Wei Zhu , Bohan Wei , Xiaocong Zhong , Ruixiang Wang , Yuping Zeng

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Abstract

In this study, the mineralogy of a novel resource of deep-sea sediments containing rare earth elements (REEs) was investigated, along with the leaching of REEs using hydrochloric acid. The results revealed that, apart from 62.0% of the Ce found in the Mn oxides, the other REEs in the deep-sea sediments mostly existed in hydroxyapatite mineral which can be easily decomposed via a hydrochloric acid leaching. An optimized REEs leaching percentage of 89.5% was achieved using 2.0 mol/L hydrochloric acid as the leaching agent, with a liquid-solid ratio of 4:1, at 60 °C for 30 min. However, Mn oxides remained stable during the leaching process, resulting in a low Ce leaching percentage of 30.7%. Under the optimized conditions, Mn oxides could be decomposed by adding 30% H₂O₂ as a reducing agent, leading to improved leaching percentages of Ce and REEs to 86.6% and 93.2%, respectively. The high leaching efficiency of REEs may further increase the utilization potential of this novel resource.

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盐酸沥滤深海沉积物中稀土元素的新来源以及用 H2O2 还原的优势

本研究调查了含有稀土元素（REEs）的深海沉积物新资源的矿物学，以及使用盐酸浸出稀土元素的情况。结果表明，除了 62.0% 的铈存在于锰氧化物中外，深海沉积物中的其他稀土元素大多存在于羟基磷灰石矿物中，而羟基磷灰石矿物很容易通过盐酸浸出法分解。使用 2.0 mol/L 盐酸作为浸出剂，液固比为 4:1，在 60 °C 下浸出 30 分钟，REEs 的最佳浸出率为 89.5%。然而，锰氧化物在浸出过程中保持稳定，导致 Ce 浸出率较低，仅为 30.7%。在优化条件下，加入 30% 的 H2O2 作为还原剂可分解锰氧化物，从而使 Ce 和 REEs 的浸出率分别提高到 86.6% 和 93.2%。REEs 的高浸出效率可进一步提高这种新型资源的利用潜力。

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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.