RECOVERY METHOD OF RARE EARTH ELEMENT

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PROBLEM TO BE SOLVED : To provide a recovery method of rare earth elements capable of separating and recovering rare earth elements at good efficiency and low cost without increasing the used amount of agents for depositing salts containing the rare earth elements. SOLUTION : A recovery method includes a sulfuric acid baking process of adding sulfuric acid to a purified ore raw material containing at least rear earth elements and baking the material to obtain baked ore, an impregnation process of adding water or a solution of inorganic acid to the baked ore to obtain a water impregnation liquid, a rear earth double salt generation process of adding solution sulfuric acid salt to the water impregnation liquid to generate sulfuric acid double salt of the rear earth elements, where the water impregnation liquid has a mass ratio of liquid and solid in a range of 3 : 1 to 7 : 1 in the impregnation process. SELECTED DRAWING : Figure 1 COPYRIGHT : (C)2017, JPO&INPIT