Method for extracting and separating light rare earth elements by using dual-functional ionic liquid

A technology of light rare earth elements and ionic liquids, which is applied in the field of extraction and separation of light rare earth elements using dual-functional ionic liquids, can solve the problems of stripping difficulties, secondary pollution, etc., and achieve broad application prospects, short equilibration time, and good separation effects Effect
CN109517985AActive Publication Date: 2019-03-26NORTHEASTERN UNIV
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
NORTHEASTERN UNIV
Publication Date
2019-03-26

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Abstract

The invention belongs to the technical field of rare earth separation and ionic liquid extraction and particularly relates to a method for extracting and separating light rare earth elements by usingdual-functional ionic liquid. The method comprises the following steps: taking an aqueous solution containing light rare earth elements as a raw material solution, combining 2-ethylhexyl phosphonic acid mono-2-ethylhexyl ester with N-octyl pyridine chloride salt, adding sodium hydroxide and adjusting, retaining negative ions of 2-ethylhexyl phosphonic acid mono-2-ethylhexyl ester and positive ionsof N-octyl pyridine chloride salt, combining the negative ions of 2-ethylhexyl phosphonic acid mono-2-ethylhexyl ester with the positive ions of N-octyl pyridine chloride salt to synthesize dual-functional ionic liquid, mixing the dual-functional ionic liquid with acidic raw material liquid, mixing and extracting, centrifuging to obtain an organic phase loaded with rare earth and extraction raffinate, carrying out back extraction of the rare earth by using a back extractant, and centrifuging to obtain a pure rare earth solution and recyclable ionic liquid. The method is high in extraction efficiency, short in equilibration time, simple to operate and free of emulsification phenomena.
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Description

technical field

[0001] The invention belongs to the technical field of rare earth separation and ionic liquid extraction, and in particular relates to a method for extracting and separating light rare earth elements by using a dual-functional ionic liquid. Background technique

[0002] Rare earth is an important non-renewable strategic resource. According to chemical properties and separation process requirements, it can be divided into light rare earth and heavy rare earth. They are widely used in new materials and new technology fields. my country's rare earth reserves rank first in the world. The content of light rare earth elements in adsorption rare earth ore and northern bastnaesite is very high. Light rare earth elements have a wide range of applications and play a pivotal role in rare earth applications. Therefore, the effective separation and purification of light rare earth elements is very important for expanding their application fields. has important meaning. [...

Claims

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