Environmentally friendly non-saponification solvent extraction and separation process for RE(III) (RE = Eu, Gd and Tb) in acetic acid solution using HEHEHP/n-heptane

IF 4.8 2区 材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING Hydrometallurgy Pub Date : 2024-08-19 DOI:10.1016/j.hydromet.2024.106386
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Abstract

The key to achieving sustainable metal extraction development is to avoid the generation of high-salt wastewater from the source. Here, a new system for the extraction and separation of lanthanide elements Eu(III), Gd(III) and Tb(III) from the acetic acid solution using HEHEHP (2-ethylhexyl hydrogen-2-ethylhexylphosphonate) was studied. The corresponding parameters including contact time, HEHEHP concentration, concentrations of rare earth metal ions and acetic acid in the initial solution, aqueous/organic phase volume ratio (R(A/O)), and temperature were considered to optimize the conditions for the separation of different rare earth elements. The results showed that the separation coefficients of Tb(III)/Gd(III) and Gd(III)/Eu(III) in the acetic acid system were approximately 6.2 and 1.7, with HEHEHP of 0.15 mol/L and R(A/O) of 2:1, and the extraction efficiency of RE(III) reached approximately 73.1%, which was higher than that in the hydrochloric acid and sulfuric acid systems. The mechanism associated with the extraction reaction was evaluated and discussed by the maximum loading capacity method, chromatographic analysis, and FT-IR spectrometric analysis. The mechanism followed a cation exchange reaction and acetic acid did not participate in the extraction process. The feasibility of the separation of Tb(III) from Eu(III) and Gd(III)was also given in terms of the separation coefficients between different elements at different extraction conditions. Since saponification is not necessary in the acetic acid extraction system, it can considerably reduce wastewater discharge to the ecological environment from the source.

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使用 HEHEHP/n-heptane 对醋酸溶液中的 RE(III)(RE = Eu、Gd 和 Tb)进行环保型非皂化溶剂萃取和分离工艺
实现金属萃取可持续发展的关键是从源头避免产生高盐废水。本文研究了一种利用 HEHEHP(2-乙基己基氢-2-乙基己基膦酸盐)从醋酸溶液中萃取和分离镧系元素 Eu(III)、Gd(III)和 Tb(III)的新系统。考虑了相应的参数,包括接触时间、HEHEHP 浓度、初始溶液中稀土金属离子和醋酸的浓度、水相/有机相体积比(R(A/O))和温度,以优化不同稀土元素的分离条件。结果表明,当 HEHEHP 为 0.15 mol/L、R(A/O) 为 2:1 时,Tb(III)/Gd(III)和 Gd(III)/Eu(III) 在醋酸体系中的分离系数分别约为 6.2 和 1.7,RE(III)的萃取效率约为 73.1%,高于盐酸和硫酸体系。通过最大装载量法、色谱分析和傅立叶变换红外光谱分析,对萃取反应的相关机理进行了评估和讨论。该机制遵循阳离子交换反应,醋酸没有参与萃取过程。根据不同萃取条件下不同元素之间的分离系数,还给出了从 Eu(III) 和 Gd(III) 中分离 Tb(III) 的可行性。由于醋酸萃取系统不需要皂化,因此可以从源头上大大减少对生态环境的废水排放。
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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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