A kind of rare earth extraction agent and the method for separating rare earth yttrium

Abstract

The invention provides a rare earth extractant, which includes one or more of the compounds of formula I, formula II and formula III. The invention provides a method for separating rare earth yttrium, comprising the following steps: 1) mixing a rare earth extractant and a diluent to obtain an organic phase; 2) mixing the organic phase with a yttrium-containing rare earth material liquid and then extracting to obtain an aqueous phase and organic phase, containing yttrium in the aqueous phase; 3) pickling the organic phase in step 2) to obtain aqueous phase and organic phase, containing yttrium in the aqueous phase; 4) organic phase in step 3) The phase is back-extracted to obtain an aqueous phase and an organic phase, and the aqueous phase contains rare earth elements such as neodymium. Compared with the prior art, the rare earth extractant provided by the present invention has good selectivity for separating rare earth elements, the structure of the rare earth extractant is stable, it can be recycled for more than one year, no emulsification occurs during extraction, and the synthesis of the extractant is simple and the cost is low .

Description

technical field [0001] The invention relates to the technical field of rare earth extraction and separation, in particular to a rare earth extraction agent and a method for separating rare earth yttrium. Background technique [0002] Yttrium is widely used in the fields of rare earth aluminum alloys, functional ceramics, lasers and phosphors. In the prior art, the separation of rare earth yttrium mainly adopts the extraction and separation method using naphthenic acid as the main extraction agent. Naphthenic acid will slowly undergo esterification reaction with mixed alcohol additives, resulting in a significant decline in extraction capacity, and needs to be replaced every few years, which not only wastes resources but may also pollute the environment and greatly increase economic costs. Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences designed and synthesized a carboxylic acid-type extractant code-named CA12. Chinese patent CN99118261.8 discloses a pro...

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Problems solved by technology

Naphthenic acid will slowly undergo esterification reaction with mixed alcohol additives, resulting in a significant drop in extraction capacity, and needs to be replaced every few years, which not only wastes resources but may also pollute the environment and greatly increase economic costs

Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences designed and synthesized a carboxylic acid-type extractant code-named CA12. Chinese patent CN99118261.8 discloses a process for separating yttrium oxide based on CA12, but CA12 is sensitive to heavy rare earth Er, Tm, Yb or Lu and Y has a lower separation factor

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