METHOD FOR RECOVERING RARE EARTH ELEMENTS FROM A SOLID MIXTURE CONTAINING A HALOPHOSPHATE AND A COMP

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The method of the invention comprises an acid attack in liquid medium solid containing a halophosphate and at least one of a rare earth compound; adding a base medium obtained previously and separating a solid phase from a liquid phase; mixing and calcining the solid obtained previously with sodium hydroxide and a compound selected from sodium bicarbonate or sodium carbonate; the redispersion in water of the calcined product, separating the solid product of the suspension obtained in the previous step; the dispersion in water of this solid and the acidification of the dispersion and the separation of the solid dispersion.