Extraction and recovery of cerium(Ⅳ) and thorium(Ⅳ) from sulphate medium by an α-aminophosphonate extractant  

作　　者：LU Youcai ZHANG Zhifeng LI Yanling LIAO Wuping 卢有彩;张志峰;李艳玲;廖伍平(State Key Laboratory of Rare Earth Resource Utilization, ERC for the Separation and Purification of REs and Thorium, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China;University of Chinese Academy of Sciences, Beijing 100049, China)

机构地区：[1]State Key Laboratory of Rare Earth Resource Utilization, ERC for the Separation and Purification of REs and Thorium, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China [2]University of Chinese Academy of Sciences, Beo＇ing 100049, China

出　　处：《Journal of Rare Earths》2017年第1期34-40,共7页稀土学报（英文版）

基　　金：Project supported by National Basic Research Program of China(973 program,2012CBA01206);the National Natural Science Foundation of China(21521092,51222404);the Strategic Priority Research Program of CAS(XDA02030100)

摘　　要：In the present work, a novel α-aminophosphonate extractant（Cextrant 230） was synthesized for the extraction and recovery of cerium and thorium from sulphate medium. The introduction of amine group into the phosphate molecule would enhance the extraction of Ce（Ⅳ） and Th（Ⅳ）. The effects of extractant concentration, H2SO4 concentration and temperature on the metal extraction were investigated in detail. It was found that the extraction of Ce（Ⅳ）, Th（Ⅳ） and REs（La, Gd, Yb） in sulphate medium decreased in the following order： Ce（Ⅳ）〉Th（Ⅳ）〉REs（Ⅲ）. A solvent extraction process to extract and recover cerium and thorium from bastnasite leaching was proposed, in which the purities of cerium and thorium products reached 99.9% and 99% with yield of 92% and 98%, respectively.In the present work, a novel α-aminophosphonate extractant（Cextrant 230） was synthesized for the extraction and recovery of cerium and thorium from sulphate medium. The introduction of amine group into the phosphate molecule would enhance the extraction of Ce（Ⅳ） and Th（Ⅳ）. The effects of extractant concentration, H2SO4 concentration and temperature on the metal extraction were investigated in detail. It was found that the extraction of Ce（Ⅳ）, Th（Ⅳ） and REs（La, Gd, Yb） in sulphate medium decreased in the following order： Ce（Ⅳ）〉Th（Ⅳ）〉REs（Ⅲ）. A solvent extraction process to extract and recover cerium and thorium from bastnasite leaching was proposed, in which the purities of cerium and thorium products reached 99.9% and 99% with yield of 92% and 98%, respectively.

关 键 词：THORIUM rare earths α-aminophosphonates solvent extraction separation 

分 类 号：TF845[冶金工程—有色金属冶金]