Method for removing calcium element in rare earth permanent magnet alloy and application thereof
By mixing rare earth permanent magnet alloys with water to generate calcium hydroxide, and utilizing resin emulsion and magnetic field separation technology, the problem of calcium element removal in rare earth permanent magnet alloys was solved, achieving efficient calcium element removal and improved alloy purity.
CN115763029BActive Publication Date: 2026-05-08HENGDIAN GRP DMEGC MAGNETICS CO LTD
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Patent Information
- Application Number
- CN202111028810.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2021-09-02
- Publication Date
- 2026-05-08
- Estimated Expiration
- 2041-09-02
AI Technical Summary
Technical Problem
In existing technologies, residual calcium in rare earth permanent magnet alloys is difficult to remove effectively, especially when washed with water, as it is easily oxidized and the removal rate is low.
Method used
The process involves mixing rare earth permanent magnet alloy with water to generate calcium hydroxide, which is then mixed with resin emulsion. An anionic surfactant is used to form a double electric layer structure, and the rare earth permanent magnet alloy is separated under the action of a magnetic field to remove calcium.
Benefits of technology
It significantly improves the removal rate of calcium in rare earth permanent magnet alloys, reduces impurity content, and enhances the purity and performance of the alloy.
✦ Generated by Eureka AI based on patent content.
Abstract
The application provides a method for removing calcium in a rare earth permanent magnet alloy and application thereof. The rare earth permanent magnet alloy contains one or more of calcium oxide, calcium hydride and metallic calcium. The method comprises the following steps: performing a first mixing process on the rare earth permanent magnet alloy and water to obtain a rare earth permanent magnet alloy containing calcium hydroxide; performing a second mixing process on the rare earth permanent magnet alloy containing calcium hydroxide and a resin emulsion to obtain a mixed solution of agglomerated particles containing calcium hydroxide and the rare earth permanent magnet alloy, wherein the resin emulsion comprises a base resin, an anionic surfactant and water, and the base resin is selected from vinyl acetate resin and / or polyacrylate; and separating the rare earth permanent magnet alloy from the mixed solution under the action of a magnetic field. The method can remove calcium in the rare earth permanent magnet alloy, and is particularly suitable for removing calcium in a rare earth permanent magnet alloy prepared by a reduction diffusion method.
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