Rare earth backflow extraction method and rare earth fully separating process employing the method

Abstract

The present invention discloses a refluence and extraction method of rare earth and a rear earth complete separation art adopting the method, the rear earth complete separation art belongs to the rear earth separation art field. The technical proposal of the present invention is that lanthanon is divided into an easy-extraction group A and a hard-extraction group B, the lanthanon near to the separation cut position in the groups of A and B is A1 and B1 respectively, the lanthanon of large mass partition chosen from A1 and B1 is used as the refluence metal, one or two connected refluence and extraction are used for producing one rear earth water solution containing only the refluence metal. One part of the rear earth water solution containing only the refluence metal is used as the product liquid output, and one part is used as the refluence liquid making the refluence metal enter into the refluent and extractive feed liquid for the refluence and extraction and separation. By analogy, the process is ended up until the rear earth is separated fully. The present invention has the advantages of single extraction system, continuous production, short technological process, and high product pureness and rear earth yield.

Description

technical field [0001] The invention relates to a technique for solvent extraction and separation of rare earths in hydrometallurgy, in particular to a rare earth reflux extraction method, and also relates to a rare earth total separation process using the method. Background technique [0002] Solvent extraction methods include cross-current extraction, counter-current extraction, fractional extraction, reflux extraction, etc. Fractional extraction is mostly used for rare earth separation. Fractional distillation extraction is to separate rare earth elements into easy-to-extract component group A and difficult-to-extract component group B. Generally, group A will contain a small amount of one or more group B rare earth elements, and group B will contain a small amount of one to Multiple Group A rare earth elements. If the process parameters are adjusted well, a pure group A or a pure group B rare earth can be produced, but the pure group A and pure group B rare earth cannot...

AI Technical Summary

Problems solved by technology

[0005] The existing complete separation production of rare earth mostly adopts fractional distillation extraction. Due to incomplete separation, multiple extraction systems are often used, which makes the process complicated and discontinuous.

And because the separation is not complete, there will be intermediate enrichments at the same time, and some intermediate enrichments will be output as low-grade products, and some will return to the previous fractionation extraction to improve the recovery rate of rare earths, but this will make the rare earth materials or separation become difficult. It is more complicated and cannot be known in advance, and the determination of process parameters of fractional distillation and extraction increases variables and difficulties, which makes the test of rare earth separation can only be completed as a whole and is difficult to control

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