Study on non-saponification extraction process for rare earth separation

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 si...

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Bibliographic Details
Published inJournal of rare earths Vol. 31; no. 5; pp. 512 - 516
Main Author 肖燕飞 龙志奇 黄小卫 冯宗玉 崔大立 王良士
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.05.2013
Subjects
Cerium
Exchanging
Extraction
Ion exchangers
magnesia
Magnesium
Magnesium oxide
non-saponification
Rare earth metals
rare earths
Separation
solvent extraction
分离过程
废水污染
最佳反应条件
氧化镁含量
皂化
稀土分离
萃取技术
萃取过程
solvent extraction
magnesia
non-saponification
rare earths
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Summary: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 ex- tractant 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.
Bibliography:XIAO Yanfei, LONG Zhiqi , HUANG Xiaowei, FENG Zongyu, CUI Dali, WANG Liangshi （National Engineering Research Center for Rare Earth Materials, General Research Institute for Nonferrous Metals, Grirem Advaneed Materials Co., Ltd., Beijing 100088, China）
11-2788/TF
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 ex- tractant 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.
magnesia; non-saponification; solvent extraction; rare earths
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ISSN:1002-0721
2509-4963
DOI:10.1016/S1002-0721(12)60311-1