使用硝酸甲基三正辛基铵和磷酸三正丁酯混合物通过溶剂萃取从硝酸盐溶液中分离稀土元素

Separation of Rare-Earth Elements from Nitrate Solutions by Solvent Extraction Using Mixtures of Methyltri-n-octylammonium Nitrate and Tri-n-butyl Phosphate.

作者信息

Stepanov Sergei I, Hoa Nguyen Thi Yen, Boyarintseva Ekaterina V, Boyarintsev Alexander V, Kostikova Galina V, Tsivadze Aslan Yu

机构信息

Department of Technology of Rare Elements and Nanomaterials Based on Them, Mendeleev University of Chemical Technology, 9 Miusskaya Square, 125047 Moscow, Russia.

A.N. Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, 31/4 Leninsky Prospect, 119071 Moscow, Russia.

出版信息

Molecules. 2022 Jan 16;27(2):557. doi: 10.3390/molecules27020557.

DOI:10.3390/molecules27020557

PMID:35056872

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC8781996/

Abstract

The article presents data on the solvent extraction separation of rare-earth elements (REEs), such as La(III), Ce(III), Pr(III), and Nd(III), using synergic mixtures of methyltrioctylammonium nitrate (TOMANO) with tri-n-butyl phosphate (TBP) from weakly acidic nitrate solutions. Specifically, experimental results on separation of REEs, for the pair Ce(III)/Pr(III) for quaternary mixtures of REEs (La(III), Ce(III), Pr(III), Nd(III)) and for the pair La(III)/Pr(III) for solutions containing La(III), Pr(III), and Nd(III), are presented. It was shown that effective separation for the pair Ce(III)/Pr(III) from a solution containing 219 g Ce(III)/L, 106 g La(III)/L, 20 g Pr(III)/L, 55 g Nd(III)/L, and 0.1 mol/L HNO, was achieved using 56 steps of a multistage, counter-current solvent extraction cascade with scrubbing, at an organic-to-aqueous phase volume ratio (O/A) equal to 2/1 on the extraction section and O/A equal to 4/1 on the scrubbing section, using 3.3 mol/L solutions of the mixture TOMANO-TBP with molar ratio 0.15:0.85 in dodecane. Separation for the pair La(III)/Pr(III) could be achieved using a solvent extraction cascade with scrubbing in 32 steps at O/A equal to 2/1 on the extraction section and O/A equal to 2.8/1 on the scrubbing section of the solvent extraction cascade from a solution containing 258 g La(III)/L, 58 g Pr(III)/L, 141 g Nd(III)/L, and 0.1 mol/L HNO with 3.0 mol/L solution of the mixture TOMANO-TBP with molar ratio 0.2:0.8 in dodecane.

摘要

本文介绍了使用硝酸甲基三辛铵（TOMANO）与磷酸三丁酯（TBP）的协同混合物，从弱酸性硝酸盐溶液中溶剂萃取分离稀土元素（REEs），如La(III)、Ce(III)、Pr(III)和Nd(III)的数据。具体而言，给出了稀土元素（La(III)、Ce(III)、Pr(III)、Nd(III)）四元混合物中Ce(III)/Pr(III)对以及含有La(III)、Pr(III)和Nd(III)的溶液中La(III)/Pr(III)对的稀土元素分离实验结果。结果表明，对于含有219 g Ce(III)/L、106 g La(III)/L、20 g Pr(III)/L、55 g Nd(III)/L和0.1 mol/L HNO₃的溶液，在萃取段有机相与水相体积比（O/A）等于2/1且洗涤段O/A等于4/1的条件下，使用3.3 mol/L的TOMANO-TBP混合物（摩尔比为0.15:0.85）在十二烷中的溶液，通过56步多级逆流溶剂萃取级联并进行洗涤，实现了Ce(III)/Pr(III)对的有效分离。对于含有258 g La(III)/L、58 g Pr(III)/L、141 g Nd(III)/L和0.1 mol/L HNO₃的溶液，在溶剂萃取级联的萃取段O/A等于2/1且洗涤段O/A等于2.8/1的条件下，使用3.0 mol/L的TOMANO-TBP混合物（摩尔比为0.2:0.8）在十二烷中的溶液，通过32步带有洗涤的溶剂萃取级联，可以实现La(III)/Pr(III)对的分离。