Separation and purification of rare-earth elements by chemical reduction in aqueous solutions

    公开(公告)号:US10988386B1

    公开(公告)日:2021-04-27

    申请号:US16884467

    申请日:2020-05-27

    IPC分类号: C01B35/12

    摘要: The subject matter described herein includes a method of separating a mixture of trivalent rare-earth elements, based on their reduction potential, and solubility in a divalent state. The method includes adding the mixture of trivalent rare-earth elements to a tetraborate salt with deionized water to form a salt mixture, grinding the salt mixture with boric acid to form a solid mixture, wetting the solid mixture with water to form a paste, heating the paste to form a resultant product, dissolving the resultant product, thereby creating a residual solid in aqueous solution, wherein the residual solid includes a second mixture of trivalent rare-earth elements, and the aqueous solution includes a substantially singular element of a divalent rare-earth element in an aqueous state, and removing the residual solid, thereby separating the divalent rare-earth element from the mixture of trivalent rare-earth elements.