期刊
JOURNAL OF RARE EARTHS
卷 30, 期 4, 页码 374-377出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/S1002-0721(12)60053-2
关键词
rare earth; thorium; recovery; stripping
资金
- 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]
Thorium (Th) stripping behavior from HEH/EHP (2-(ethylhexyl) phosphoric acid mono-2-ethylhexyl ester) with H2SO4, HCl and HNO3 were investigated. The results indicated that H2SO4 was the most effective stripping reagent compared with HCl 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 of Ce, F and Th were more than 99%, 98% and 95% separately.
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