Extraction enhancement and mechanism of light rare-earth elements (III) in chloride medium through adding complexing agent and synergistic effect
Extraction enhancement and mechanism of light rare-earth elements (III) in chloride medium through adding complexing agent and synergistic effect
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DOI：
10.1080/01496395.2019.1705346
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发表时间：
2019-12
影响因子：
2.8
通讯作者：
Fengyun Zhang;Xiaojie Sun;Jin Wang;Qiang Zhang;Shufeng Sun
中科院分区：
文献类型：
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作者：
Fengyun Zhang;Xiaojie Sun;Jin Wang;Qiang Zhang;Shufeng Sun
摘要2-乙基己基磷酸单-2-乙基己基酯（HEHEHP）和二-2-乙基己基磷酸（D2EHPA）这两种酸性有机磷萃取剂的二元混合物被广泛用于氯化物介质中轻稀土（LRE）的萃取和分离，并表现出明显的协同效应。在水相中加入水溶性络合剂乳酸（HLac），优化提取工艺。深入研究了LRE与水、HLac和萃取剂在各相中的相互作用，以阐明萃取行为。基于实验结果，详细研究了萃取过程中发生的化学反应，验证了阳离子交换（P- oh波段）和配位相互作用（P = O波段）对LRE萃取的贡献。
ABSTRACT A binary mixture of two acidic organophosphorus extractants, such as 2-ethylhexylphosphonic mono-2-ethylhexyl ester (HEHEHP) and di-2-ethylhexyl phosphoric acid (D2EHPA), is widely employed for the extraction and separation of light rare earths (LRE) from chloride medium, which displayed pronounced synergistic effect. The water-soluble complexing agent lactic acid (HLac) was added to the aqueous phase to optimize the extraction process. The interactions of LRE with water, HLac and extractants in each phase have been deeply studied to elucidate the extraction behavior. Based on the experiment results, the chemical reactions that occur during extraction are studied in detail, the cation exchange (P-OH bands) and coordination interaction (P = O bands) contribute to LRE extraction were verified.