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首页> 外文期刊>Separation and Purification Technology >Liquid-liquid extraction and separation possibilities of heavy and light rare-earths from phosphoric acid solutions with acidic organophosphorus reagents
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Liquid-liquid extraction and separation possibilities of heavy and light rare-earths from phosphoric acid solutions with acidic organophosphorus reagents

机译：用酸性有机磷试剂从磷酸溶液中液-液萃取重稀土和轻稀土的可能性

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摘要

Liquid-liquid extraction of mixture of seven heavy rare-earths (HREs) such as terbium, dysprosium, holmium, yttrium, erbium, ytterbium, and lutetium and mixture of four light rare-earths (LREs) such as lanthanum, cerium, praseodymium and neodymium has been investigated from phosphoric acid solutions. Extractants used are, Talcher organic phosphorus solvent (TOPS 99), an equivalent to di-2-ethylhexyl phosphoric acid, 2-ethylhexylphosphonic acid mono-2-ethylhexyl ester (PC-88A), and bis(2,4,4-trimethylpentyl) phosphinic acid (Cyanex 272). The objective of the present study was to investigate the extraction behavior and separation possibilities among HREs and LREs and also separation of HREs as a group from LREs in 3-5 M acid, which is similar to wet phosphoric acid concentration. The parameters studied include time, H3PO4 concentration and extractant concentration. The percent extraction of metal decreases as the acid concentration increases with any given extractant concentration. Mechanism of metal transfer follows ion exchange type. The separation factors were evaluated based on the distribution coefficients in order to estimate the potential of the results for the separation of individual/pair of rare-earths from others and the separation of HREs from LREs. Extraction efficiency of extractants towards lanthanides from H3PO4 medium decreases in the series: TOPS 99 > PC 88A > Cyanex 272.
机译：液-液萃取七种重稀土（HRE）的混合物，例如ter，，，钇，，，和，以及四种轻稀土（LRE）的混合物，例如镧，铈，和and已经从磷酸溶液中研究了钕。所用的萃取剂为Talcher有机磷溶剂（TOPS 99），相当于二-2-乙基己基磷酸，2-乙基己基膦酸单-2-乙基己基酯（PC-88A）和双（2,4,4-三甲基戊基）次膦酸（Cyanex 272）。本研究的目的是研究HRE和LRE之间的萃取行为和分离可能性，以及在3-5 M酸中从LRE中分离出HRE作为一组的现象，这与湿磷酸浓度相似。研究的参数包括时间，H3PO4浓度和萃取剂浓度。在任何给定的萃取剂浓度下，金属的萃取百分率随酸浓度的增加而降低。金属转移的机理遵循离子交换类型。基于分布系数对分离因子进行了评估，以便估计将单个/成对的稀土彼此分离以及将HRE与LRE分离的结果的潜力。从H3PO4介质中提取剂对镧系元素的提取效率按以下顺序降低：TOPS 99> PC 88A> Cyanex 272。

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