Toward greener comprehensive utilization of bastnaesite: Simultaneous recovery of cerium, fluorine, and thorium from bastnaesite leach liquor using HEH(EHP)
Toward greener comprehensive utilization of bastnaesite: Simultaneous recovery of cerium, fluorine, and thorium from bastnaesite leach liquor using HEH(EHP)
复制标题
实现氟碳铈矿更加绿色的综合利用：利用 HEH(EHP) 从氟碳铈矿浸出液中同时回收铈、氟和钍
DOI：
10.1016/j.cej.2012.09.126
复制
发表时间：
2013-01-15
影响因子：
15.1
通讯作者：
Cui, Dali
中科院分区：
文献类型：
--
作者：
Wang, Liangshi;Yu, Ying;Cui, Dali
研究了以HEH（EHP）（2-乙基己基膦酸单-2-乙基己基酯）为溶剂从氟碳铈矿硫酸浸出液中萃取回收铈、氟和钍的新工艺，考察了反萃液中HEH（EHP）浓度、H2 O2化学计量量和H2SO 4浓度对萃取量和纯度的影响。分析表明，HEH（EHP）对Ce（III）的萃取能力很小，萃取效率为Ce（IV）> F（I）> Th（IV）>> Ce（III）。在用Al（III）配位洗涤F（I）之后，用H2 O2和HCl还原性地汽提Ce（IV），允许回收纯度为99.95%的CeO 2。通过多级逆流萃取试验，确定了萃取系统工业应用的适宜工艺参数，表明该工艺为氟碳铈矿中稀土的分离回收提供了一个更加环保的一体化流程。(C)2012 Elsevier B. V.保留所有权利。
This paper describes a novel process for conducting the extraction and recovery of cerium, fluorine, and thorium from a bastnaesite sulfuric leaching solution using HEH(EHP) (2-ethylhexylphosphonic mono-2-ethylhexyl ester) as the solvent, and investigates the effects of HEH(EHP) concentration, the stoichiometric quantity of H2O2, and H2SO4 concentration in the Th(IV) stripping liquor on extraction quantity and purity. Analysis of the process shows that Ce(III) extraction capacity with HEH(EHP) is negligible, and extraction efficiency for the elements is in order of Ce(IV) > F(I) > Th(IV) >> Ce(III). After coordination scrubbing of F(I) with AI(III), Ce(IV) is reductively stripped with H2O2 and HCI, allowing recovery of CeO2 with a purity of 99.95%. Furthermore, this paper provides appropriate technical parameters for industrial application of the extraction system-confirmed by a multistage countercurrent extraction test-showing that this process provides a more environmentally sound integrated separation and recovery flow of rare earths from bastnaesite. (C) 2012 Elsevier B.V. All rights reserved.