| 简介 |
PROBLEM TO BE SOLVED : To provide a method for recovering a compd. contg. reutilizable rare- earth element such as rare-earth oxide, rare-earth fluoride or rare-earth metal inexpensively, efficiently and effectively in terms of safety from the rare-earth metal-contg. scrap alloy such as the scrap alloy, defective product, slag, etc., generated when a product is produced from a rare-earth metal-contg. alloy. SOLUTION : The rare-earth metal-contg. scrap alloy is hydrogenated at the least to crush the scrap alloy, and the crushed scrap alloy is heated to obtain the oxide. The oxide is brought into contact with an acid soln. to exude the rare-earth element as its ion, the soln. contg. the rare-earth element ion is filtered to obtain a filtrate, and a precipitate contg. the rare-earth element is deposited from the filtrate. |
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