Thermodynamic and application study of complicated extraction system Ce(Ⅳ)-HF-H_(3)BO_(3)-H_(2)SO_(4) using Cyanex 923  

作　　者：Dan Zou Haitian Li Ji Chen Deqian Li 

机构地区：[1]State Key Laboratory of Baiyunobo Rare Earth Resource Researches and Comprehensive Utilization,Baotou 014030,China [2]State Key Laboratory of Rare Earth Resources Utilization Changchun Institute of Applied Chemiscry,Chinese Academy of Sciences,Changchun 130022.China

出　　处：《Journal of Rare Earths》2021年第9期1117-1125,共9页稀土学报（英文版）

基　　金：Project supported by the Open Research Fund for State Key Laboratory of Baiyunobo Rare Earth Resources Researches and Comprehensive Utilization(E0900001);the National Basic Research Program of China(2012CBA01202);the National Natural Science Foundation of China(51174184)。

摘　　要：This article aims to reduce the environmental pollution while maximizing the recovery of REEs as well as associate resource-fluorine(F)from bastnaesite.This paper investigates the extraction equilibrium process and mechanism of Ce(Ⅳ)-HF-H_(3)BO_(3)-H_(2)SO_(4)system using Cyanex 923.Extraction equilibrium process of different systems,including HF-H_(2)SO_(4),H_(3)BO_(3)-HF-H_(2)SO_(4),and Ce(Ⅳ)-HF-H_(2)SO_(4),were studied in detail and the corresponding extraction mechanisms were also determined.It is noteworthy that a synergistic effect between B-F and an antagonistic effect between Ce(Ⅳ)-F were discovered first in the extraction process by Cyanex 923.Besides,H_(3)BO_(3)is found to be able to promote the extraction of F in quantitation by Cyanex 923.FTIR and^(11)B and^(19)F NMR were adopted to characterize the different loaded organic phase.Based on these results,the extraction mechanism of complicated system Ce(Ⅳ)-HF-H_(3)BO_(3)-H_(2)SO_(4)was further determined.Besides,the effect of H_(3)BO_(3)on the extraction and stripping of Ce(Ⅳ)in complicated system was studied.Moreover,it shows that the addition of H_(3)BO_(3)has nothing to do with the purity of obtained CeF_(3)particle from bastneasite liquor in the practical system.Adding H_(3)BO_(3)into bastnaesite leach liquor,on the one hand,will be beneficial for the recovery yield of Ce and F.On the other hand,it can avoid from environmental pollution caused by emission of F-containing waste water as well as reducing the waste residue.

关 键 词：Ce(Ⅳ)-HF-H_(3)BO_(3)-H_(2)SO_(4) Extraction Cyanex 923 THERMODYNAMIC Mechanism Rare earths 

分 类 号：TQ133.3[化学工程—无机化工]