Method for extracting and separating cerium and terbium in waste fluorescent powder or solution by using non-aqueous phase solvent

CN120796749APending Publication Date: 2025-10-17QIANDONG RARE EARTH GRP +1
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Patent Information

Application Number
CN202510987245.6
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-07-17
Publication Date
2025-10-17

AI Technical Summary

Technical Problem

Traditional solvent extraction methods have problems such as poor selectivity, low extraction efficiency, and serious environmental pollution when separating the rare earth elements cerium and terbium. Especially in the recycling process of waste rare earth phosphors, existing technologies are difficult to achieve efficient and green separation.

Method used

A non-aqueous solvent extraction method is adopted, and a high-efficiency non-aqueous solvent extraction system is constructed using polar organic solvents such as dipropylene glycol (DPG) and acidic extractant Cyanex 272. By regulating the solvation effect of rare earth ions in the extraction system, the precise extraction and separation of rare earth ions can be achieved.

Benefits of technology

It significantly improves the extraction efficiency and selectivity of rare earth elements, reduces the number of extraction stages and acid and alkali consumption, reduces the environmental burden, complies with the principles of green chemistry, and has potential for industrial application.

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Abstract

The invention provides a method for extracting and separating cerium and terbium in waste fluorescent powder or a solution by using a non-aqueous phase solvent. According to the method for extracting and separating the cerium and the terbium in the waste fluorescent powder or the solution through the non-aqueous phase solvent, a polar organic solvent is adopted to replace most of water in a traditional water phase, and a non-aqueous phase solvent extraction system composed of a high-polarity organic phase and a low-polarity organic phase is constructed; according to the system, the dielectric constant and the surface tension are remarkably reduced by adding the polar organic solvent, the influence of hydration on rare earth extraction is effectively weakened, and the stability of an extraction complex is remarkably improved, so that the extraction separation performance is improved; on the basis of the essence of rare earth solvent extraction and the balance principle of the solvation of rare earth and the coordination of rare earth and an extraction agent, the solvation of rare earth ions in an extraction system is regulated and controlled by selecting a polar organic solvent as dipropylene glycol, and the rare earth ions in the extraction system are extracted under the condition that the extraction agent is kept unchanged. Accurate regulation and control of rare earth ion extraction selectivity are realized.
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