Process for extracting cerium from an aqueous solution containing a mixture of rare earth elements.

摘要

Process for the selective extraction of cerium from an aqueous solution of rare-earth elements, according to which alkali metal hypochlorite (15) is added to the aqueous solution (13) while the pH is maintained at a value above 4.5, to precipitate the cerium in the form of ceric hydroxide and from the resulting slurry there are separated (19, 25, 28, 47), on the one hand, a precipitate of ceric hydroxide (48) and, on the other hand, a mother liquor (32) containing the other elements in the dissolved state. <IMAGE>