method for recovering rare earths from a solid mixture containing a halophosphate and a rare earth compound and suitable mixture for said method

摘要

Method for recovering rare earths from a solid mixture containing a halophosphate and a rare earth compound and a mixture suitable for said method The method of the invention comprises treating with acid in a liquid medium a solid containing a halophosphate and a earth compound. rare; adding a base to the previously obtained medium and separating a solid phase from a liquid phase; mixing and calcining the solid obtained above with an alkaline solid compound; repeat dispersing the calcined product in water, separating the solid product from the suspension obtained in the preceding step; dispersing this solid in water and acidifying the dispersion and separating the solid from said dispersion.