Separation of rare earth elements using supported membrane solvent extraction
Patent Information
- Authority / Receiving Office
- HK · HK
- Patent Type
- Patents
- Current Assignee / Owner
- UT BATTELLE LLC
- Filing Date
- 2022-10-14
- Publication Date
- 2026-07-17
AI Technical Summary
Existing technologies are difficult to efficiently separate and recover rare earth elements from waste permanent magnets, especially the light rare earth elements Nd and Pr from the heavy rare earth element Dy. Furthermore, traditional methods suffer from problems such as the use of numerous chemicals, environmental pollution, and high energy consumption.
A loaded membrane solvent extraction method is adopted, which utilizes hollow fiber membrane modules and phosphorus-based chelating extractant Cyanex 572. By flowing aqueous feed solution and stripping solution inside and outside the hollow fiber, the selective extraction and separation of rare earth elements are achieved, avoiding equilibrium limitation and emulsion formation.
It achieves high-purity separation and recovery of rare earth elements, especially Dy, with a purity of over 99.5%, reducing chemical usage and energy consumption, minimizing environmental pollution, and is suitable for the treatment of highly polluting waste.
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