期刊
JOURNAL OF RARE EARTHS
卷 31, 期 5, 页码 512-516出版社
ELSEVIER
DOI: 10.1016/S1002-0721(12)60311-1
关键词
magnesia; non-saponification; solvent extraction; rare earths
资金
- National High Technology Research and Development Program of China (863 plan) [2010AA03A405]
- Key Program of National Natural Science Foundation of China [50934004]
The purpose of this study was to overcome the disadvantages of ammonia-nitrogen wastewater pollution and high cost of sodium saponification in rare earth separation process. The study focused on the non-saponification extraction technology with magnesia. The influences of the content and particle size of magnesia, reaction time, reaction temperature, and O/A on cerium extraction rate were also discussed. The results showed that the hydrogen ions of extractant were exchanged by rare earth ions when organic extractant and rare earth solution were mixed with magnesia powder, and then the exchanged hydrogen dissolved magnesia to make the acidity of the system stable. The magnesium ions were not participated in the extraction reaction. Non-saponification extraction process of rare earth had been realized. The cerium extraction rate could reach up to 99% in single stage within the optimal reaction conditions.
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