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A rare earth recovery and enrichment process

A rare earth and process technology, applied in the field of rare earth extraction and separation, to achieve the effect of easy industrial production, high purity and high yield

Active Publication Date: 2021-07-16
甘肃广晟稀土新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current process still focuses on the separation of light and medium rare earths. For the extraction and enrichment of multi-element rare earth feed liquid containing heavy rare earths, there are still technical difficulties in how to improve the purity and recovery rate of the separated products.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The sulfonated kerosene solution of P507 was used as the extractant. The rare earth chloride feed solution containing lanthanum, cerium, dysprosium and ytterbium elements with a pH value of 3 is the solution to be extracted, and the rare earth concentration of the solution to be extracted is 0.3 mol / L. In the extraction reactor, add the solution to be extracted, P507 and OH successively - Type strong basic anion exchange resin, under heating condition, stirring reaction 15min, then stand still 1h, separate organic phase, aqueous phase and anion exchange resin phase, described aqueous phase is the feed liquid containing lanthanum cerium, and described organic phase It is an organic phase loaded with dysprosium and ytterbium. The molar ratio of rare earth elements and P507 in the solution to be extracted is 0.3:1, and the OH - The molar ratio of the strong basic anion exchange resin to the chloride ion in the solution to be extracted is 15:1. The OH - The type strong ...

Embodiment 2

[0021] The sulfonated kerosene solution of P507 was used as the extractant. The rare earth chloride feed liquid containing lanthanum, cerium, dysprosium and ytterbium elements with a pH value of 4 is the solution to be extracted, and the rare earth concentration of the solution to be extracted is 0.4 mol / L. In the extraction reactor, add the solution to be extracted, P507 and OH successively - Type strong basic anion exchange resin, under heating condition, stirring reaction 12min, then stand still 0.5h, separate organic phase, aqueous phase and anion exchange resin phase, described aqueous phase is the feed liquid containing lanthanum cerium, described organic The phase is an organic phase loaded with dysprosium and ytterbium. The molar ratio of rare earth element and P507 in the described solution to be extracted is 0.4: 1, and the OH - The molar ratio of the strong basic anion exchange resin to the chloride ion in the solution to be extracted is 10:1. The OH - The type ...

Embodiment 3

[0023] The sulfonated kerosene solution of P507 was used as the extractant. The rare earth chloride feed solution containing lanthanum, cerium, dysprosium, and ytterbium elements with a pH value of 5 is the solution to be extracted, and the concentration of the rare earth in the solution to be extracted is 0.5 mol / L. In the extraction reactor, add the solution to be extracted, P507 and OH successively - Type strong basic anion exchange resin, under heating condition, stirring reaction 10min, then stand still 0.5h, separate organic phase, aqueous phase and anion exchange resin phase, described aqueous phase is the material liquid containing lanthanum cerium, and described organic The phase is an organic phase loaded with dysprosium and ytterbium. The molar ratio of rare earth elements and P507 in the solution to be extracted is 0.5: 1, and the OH - The molar ratio of the strong basic anion exchange resin to the chloride ion in the solution to be extracted is 12:1. The OH -T...

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Abstract

The invention relates to a rare earth recovery and enrichment process, which uses the P507 and OH ‑ Type strong basic anion exchange resin, which extracts and separates the rare earth chloride feed liquid step by step, and prepares it with conventional separation methods such as fractional crystallization, step-by-step precipitation, ion-exchange chromatography, and extraction chromatography in the prior art. Compared with rare earth products separated by rare earth solution, the technical scheme of extraction, enrichment and separation of rare earth elements used in the present invention has sufficient separation of rare earth elements such as product lanthanum, product cerium, product dysprosium and product ytterbium, and high purity. , high yield, suitable for large-scale production, easy to operate, low production cost, convenient for industrialized production and the like.

Description

technical field [0001] The invention relates to the field of rare earth extraction and separation, in particular to a rare earth recovery and enrichment process. Background technique [0002] Most of the separation methods of rare earth elements are wet methods. Although the physical and chemical properties of rare earth elements are similar, there are still slight differences between rare earth compounds. Or the precipitation reaction will widen the small difference, so that the rare earth elements can be separated from each other. The separation methods of rare earth elements mainly include fractional crystallization, fractional precipitation, ion exchange chromatography, extraction chromatography, solvent extraction and so on. Solvent extraction is also called liquid-liquid extraction. Its separation principle is to use the difference in distribution coefficient of the extracted substance in the aqueous phase and the organic phase to transfer the extracted substance from...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B59/00C22B3/38C22B3/28
CPCC22B59/00C22B3/28C22B3/3844C22B3/3846Y02P10/20
Inventor 吕宝超
Owner 甘肃广晟稀土新材料有限公司