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

An extraction and rare earth technology, applied in the field of solvent extraction and separation of rare earths, can solve problems such as difficult regulation, complex process, incomplete separation, etc., and achieve the effect of reducing the impact of yield, improving the separation effect, and completely separating rare earths

Inactive Publication Date: 2008-02-06
蔡春涛
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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

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Experimental program
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Effect test

Embodiment 1

[0030] Referring to Fig. 1, the rare earth raw material is an aqueous solution 7, wherein A 1 It is the only rare earth metal in group A, and it is a reflux metal. The reflux extraction unit only contains one reflux extraction 1, which uses water phase feed, and the outlet water phase 3 of reflux extraction 1. If it only contains B 1 A rare earth metal, then it becomes B 1 The product liquid output, if it contains two or more rare earth metals, it will become the rare earth raw material for the next reflux extraction unit. The outlet organic phase 2 of the reflux extraction 1 is subjected to high-acid stripping in the multi-stage stripping tank 4, and the outlet organic phase 6 of the stripping tank 4 is desaponified and recycled after saponification. Part of the stripping solution is used as A 1 The product liquid output, a part as reflux liquid 5. After the raw material aqueous solution 7, the reflux liquid 5 and the concentrated alkali 8 are mixed into a low-acid solutio...

Embodiment 2

[0032] Referring to shown in Figure 2, the rare earth raw material is an organic phase, where A 1 It is the only rare earth metal in group A, and it is a reflow metal. This embodiment is basically the same as embodiment 1, except that the rare earth raw materials are different, one is the organic phase 22, and the other is the aqueous solution 7. The organic phase 22 is subjected to high-acid countercurrent stripping in the stripping tank 23, and the organic phase at the outlet of the stripping tank 23 is desaponified and recycled after saponification. The outlet water phase 24 of the stripping tank 23 is equivalent to the aqueous solution 7 in the embodiment 1, and others are the same as the embodiment 1.

Embodiment 3

[0034] Referring to Fig. 3, the rare earth raw material is an organic phase 22, wherein B 1 It is the only rare earth metal in group B, and it is a reflux metal. The reflux extraction unit only includes a reflux extraction 19, which uses an organic phase feed, and the outlet organic phase 20 of the reflux extraction 19. If it only contains A 1 , then after it is stripped, the stripped liquid becomes A 1 The product liquid is output. If the organic phase 20 contains two or more rare earth metals, it will become the rare earth raw material for the next reflux extraction unit. Outlet aqueous phase 21 of reflux extraction 19, a part is as B 1 The product liquid output, a part as reflux liquid 21. The raw material liquid organic phase 22 is subjected to high-acid stripping in the multi-stage stripping tank 23, and the organic phase at the outlet of the stripping tank 23 is desaponified and recycled after saponification. After the outlet water phase 24, reflux liquid 21 and conce...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/26C22B59/00
CPCY02P10/20
Inventor 蔡春涛
Owner 蔡春涛
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