Extraction and back-extraction behaviors of 14 rare earth elements from sulfuric acid medium by TODGA

作     者：Huiting Yuan Weixiang Hong Yushan Zhou Baisong Pu Aijun Gong Tao Xu Qishan Yang Fukai Li Lina Qiu Weiwei Zhang Yuning Liu 

作者机构：School of Chemistry and Biological EngineeringUniversity of Science and Technology BeijingBeijing 100083China North China Rare Earth Hi-Tech Company LimitedBaotou 014030China School of Chemistry and Chemical EngineeringInner Mangolia University of Science and TechnologyBaotou 014010China 

出 版 物：《Journal of Rare Earths》 (稀土学报（英文版）)

年 卷 期：2018年第36卷第6期

页      面：642-647页

核心收录：

学科分类：081704[工学-应用化学] 07[理学] 08[工学] 0817[工学-化学工程与技术] 0703[理学-化学] 070301[理学-无机化学] 

基　　金：supported by Beijing Natural Science Foundation(8172033) Fundamental Research Funds for the Central Universities of China(FRF-BR-15-015A) 

主　　题：Rare earth Extraction Back-extraction N,N,N',N' Tetra-octyl-3-oxopentanediamide(TODGA) Enrichment 

摘      要：The unique physical and chemical properties of rare earth elements lay the foundation for their extensive application. N,N,N’,N’ Tetra-octyl-3-oxopentanediamide(TODGA) is excellent in its ability of extracting rare earth elements and it is favored for green initiative. In this paper, the extraction and back-extraction of14 rare earth elements by TODGA were studied. Experiments show that in conditions of 6 mol/L sulfuric acid, the extraction temperature of 25 ℃,the phase ratio of 1:1 and 0.04 mol/LTODGA(aviation kerosene as the diluent), the extraction rates of 14 rare earth elements including lanthanum, cerium, praseodymium,neodymium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium, and yttrium were 99.00%-99.73%. Mixed with hydrochloric acid and nitric acid(HCl 3.5 mol/L, HNO30.5 mol/L), the recoveries of the 14 rare earth elements are 91.52%-99.91% when the extraction temperature is 25 ℃ and the ratio is 1:1. The following application is based on the optimum conditions above with practical samples(from the roasting production line of China North Rare Earth High-tech Company Limited) for extraction and back-extraction experiments. Experiments show that TODGA has excellent enrichment effect on 14 rare earth elements, the extraction rates are 91.36%-99.80%, the back-extraction rates are 87.29%-99.64% and the total recoveries are 81.19%-99.44%.