A kind of extractant and its preparation method and application

An extractant and rare earth technology, applied in the field of extractant and its preparation, can solve the problems of difficult solid-liquid separation, large consumption of chemical reagents, small particle size of rare earth, etc., and achieves large size of rare earth precipitate, easy and good solid-liquid separation The effect of sedimentation rate
CN110042234BActive Publication Date: 2021-08-03XIAMEN INST OF RARE EARTH MATERIALS
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
XIAMEN INST OF RARE EARTH MATERIALS
Publication Date
2021-08-03

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Abstract

The invention provides an extractant and its preparation method and application. The phenoxydicarboxylic acid extractant is synthesized by reacting a quinone compound and a halogenated alkyl carboxylate in a solvent, followed by acidification; and then through saponification The Extractant Enrichment MgSO of Ion Adsorption Rare Earth Minerals 4 Trace rare earths in the leaching solution, compared with existing extractants, has higher precipitation capacity and better rare earth selectivity, high precipitation efficiency, and larger size of rare earth precipitates, which is beneficial to the extraction of rare earth complexes and The separation of the water phase improves the production efficiency, and the enrichment process of the present invention has no volatile diluent, the COD value of the raffinate meets the national wastewater discharge standard of China, and both the raffinate and the carboxylic acid extractant can be recovered and recycled.
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Description

technical field

[0001] The invention belongs to the field of rare earth enrichment, and in particular relates to an extractant and its preparation method and application. Background technique

[0002] Due to the unique properties of rare earths and their applications in high-tech fields such as luminescence, electronics and magnetism, the rare earth industry has developed rapidly in the past few decades. China is rich in rare earth resources, and its annual output accounts for more than 90% of the world's total output, especially ion-adsorption rare earth ores, which are mainly distributed in Jiangxi, Guangdong, Hunan, Guangxi, Fujian and other places in my country. Studies have found that in ion-adsorption rare earth minerals The medium and heavy rare earths found in the minerals are more than ten times more than other light rare earth rich minerals. In the prior art, ammonium sulfate is usually used as a leaching solution to recover rare earths from ion-adsorbed minerals; ...

Claims

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