Treatment method of emulsion generated by extraction and separation of rare earth elements

By treating the emulsion with oxalic acid solution, the problem of difficult handling of emulsions in rare earth extraction and separation was solved, enabling the recovery of valuable components and cost reduction, and improving the efficiency and economy of rare earth extraction and separation.

CN121250147APending Publication Date: 2026-01-02CHINA NORTHERN RARE EARTH (GROUP) HIGH TECH CO LTD +1
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Patent Information

Application Number
CN202511283398.9
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-09-09
Publication Date
2026-01-02

AI Technical Summary

Technical Problem

Emulsions generated during the extraction and separation of rare earth elements are difficult to handle, affecting extraction and separation efficiency and cost. Furthermore, existing technologies are complex, energy-intensive, and the organic phase is difficult to recover.

Method used

The emulsion was treated with oxalic acid solution. After the emulsion was decomposed by stirring, it was separated into layers. Valuable components, rare earth oxides and P507 organic phase, were recovered. The acidity and complexing properties of oxalic acid were used to achieve back-extraction and clarification of the organic phase.

Benefits of technology

This method improves the yield of rare earth oxides, reduces the consumption of organic phase, decreases waste residue emissions, lowers treatment costs, and enables the secondary utilization of emulsions.

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Abstract

The invention discloses a treatment method of an emulsion generated by rare earth element extraction and separation, which comprises the following steps: adding an oxalic acid solution into the emulsion generated by rare earth element extraction and separation, stirring, decomposing the emulsion by oxalic acid, depolymerizing and layering; extracting supernatant liquid, filtering, and recovering an oxalic acid solution and an organic phase; and extracting a middle water phase, filtering together with the lower oxalate, recovering the oxalate and the oxalic acid solution, combining the oxalic acid solutions obtained twice, preparing the concentration, and returning to the emulsion decomposition and depolymerization process. According to the method, the emulsion is treated by oxalic acid, so that rare earth oxide and P507 organic phase in the emulsion are recovered, and the discharge amount of waste residues is reduced.
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