Study on thorium recovery from bastnaesite treatment process  

作　　者：张永奇 徐旸 黄小卫 龙志奇 崔大立 胡丰 

机构地区：[1]Grirem Advanced Materials Co.,Ltd.,National Engineering Research Center for Rare Earth Materials,General Research Institute for Nonferrous Metals

出　　处：《Journal of Rare Earths》2012年第4期374-377,共4页稀土学报（英文版）

基　　金：Project supported by National Natural Science Foundation of China (50934004);Key Industrial Technological Development Projects of National Development and Reform Commission (2009, 606);National High Tech Research and Development Project (2010AA03A405);Water Pollution Control and Management Technology of the Major Projects Foud (2009ZX07529-005)

摘　　要：Thorium （Th） stripping behavior from HEH/EHP （2-（ethylhexyl） phosphoric acid mono-2-ethylhexyl ester） with H2SO4, HC1 and HNO3 were investigated. The results indicated that H2SO4 was the most effective stripping reagent compared with HC1 and HNO3. Selecting H2SO4 as the stripping reagent, the effect of phase ratio, acidity, H2SO4 amount, HEH/EHP concentration and Th loading in HEH/EHP on Th stripping were systematically investigated. As a result, the optimum stripping conditions of Th（IV） were obtained as the concentration of H2SO4 solution was 3.50 mol/L, phase ratio was 4：1. Low HEH/EHP concentration was benefit for Th stripping. Based on the results, pilot test for new Bastnaesite treatment process was carried out and the recovery ofCe, F and Th were more than 99%, 98% and 95% separately.Thorium （Th） stripping behavior from HEH/EHP （2-（ethylhexyl） phosphoric acid mono-2-ethylhexyl ester） with H2SO4, HC1 and HNO3 were investigated. The results indicated that H2SO4 was the most effective stripping reagent compared with HC1 and HNO3. Selecting H2SO4 as the stripping reagent, the effect of phase ratio, acidity, H2SO4 amount, HEH/EHP concentration and Th loading in HEH/EHP on Th stripping were systematically investigated. As a result, the optimum stripping conditions of Th（IV） were obtained as the concentration of H2SO4 solution was 3.50 mol/L, phase ratio was 4：1. Low HEH/EHP concentration was benefit for Th stripping. Based on the results, pilot test for new Bastnaesite treatment process was carried out and the recovery ofCe, F and Th were more than 99%, 98% and 95% separately.

关 键 词：rare earth THORIUM RECOVERY STRIPPING 

分 类 号：TF845[冶金工程—有色金属冶金]