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

IF 4.8 2区 材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING
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引用次数: 0

摘要

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。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

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

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

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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来源期刊
Hydrometallurgy
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.
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