MUMBAI, India, Aug. 12 -- Intellectual Property India has published a patent application (202637046095 A) filed by Carester; and Rhodia Operations on April 10, 2026, for Method For Removing The Actinium Contained In A Rare Earth Solution With An Organophosphorus Solvent, And Rare Earth Compositions Obtained By This Method.
Inventors include Bertuol, Clmence; Rollat, Alain; and Leveque, Alain.
The application for the patent was published on August 07, 2026, under issue no. 32/2026.
Abstract: The invention relates to a method for removing the actinium contained in an initial aqueous solution of rare earth sulfates, said method comprising the following steps: - contacting and mixing the initial aqueous solution with an organic solvent, said organic solvent comprising at least one cationic extraction agent, - separating the rare earths and the actinium by liquid-liquid extraction, - contacting the organic solvent comprising the rare earths, with the exception of a portion of the lanthanum, with an acid solution, to produce a rare earth solution having an actinium concentration lower than the actinium concentration of the initial aqueous solution, said rare earth solution constituting a rare earth composition comprising the rare earths Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu and Y, and the La concentration of which is lower than that of the initial aqueous solution.
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