METHOD FOR REPROCESSING RARE EARTH OXYSULFIDES

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The invention relates to a method for reprocessing rare earth oxysulfides which occur in the production of scintillator ceramics or similar ceramic illuminants or similar fluorescent substances as residues. The oxysulfides are transferred by annealing under oxidative conditions into a mixed oxide of the obtained rare earth metals, which can be resupplied to the production process of the scintillator ceramics. An economically and ecologically disadvantageous disposal of valuable rare earth resources is thus avoided according to the invention.