Method and system for separation of rare earth elements from secondary sources

    公开(公告)号:US11525170B2

    公开(公告)日:2022-12-13

    申请号:US16799884

    申请日:2020-02-25

    Abstract: Recovery of rare earth elements (REEs) from electronic wastes is a promising approach. The existing methods for separation of REE from the secondary sources are not economically viable and scalable. A method and system for separation of rare earth metals from a plurality of secondary sources has been provided. The magnet is obtained from the secondary sources which is then crushed to a coarser size. The powder is then demagnetized by heating and roasted at high temperature to obtain the metal oxides. The metals oxides are then dissolved by acid leaching to obtain leach liquor. Iron is removed from leach liquor by precipitation and separated by filtration. The individual REE is then separated by liquid-liquid extraction. The conditions in liquid-liquid extraction are adjusted such that only desired REE is separated. The extracted REE is then stripped out by acid. The individual rare earth element is then precipitated and dried.

    Synthesis of nano particles
    3.
    发明授权

    公开(公告)号:US11583924B2

    公开(公告)日:2023-02-21

    申请号:US16727757

    申请日:2019-12-26

    Abstract: A method for synthesis of nanoparticles are described. The method includes dispersing metal oxide powder in a mixture of a base liquid and a surfactant to form a primary mixture, grinding the primary mixture using a grinding media by periodically adding a surfactant solution to form a slurry, extracting a predetermined amount of sample from the slurry at periodic time intervals to obtain a testing solution to assess particle size of in the slurry using a particle size analyzer; and systematically adding the surfactant solution and the grinding media to the slurry based on the assessed particle size in the testing solution until a mean particle size of the nanoparticles is achieved.

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