Rare earth/transition metal alloy scrap treatment method

Details Rare earth/transition metal alloy scrap treatment method Rare earth/transition metal alloy scrap treatment method

C - Chemistry, Metallurgy

22

B

C22B 7/00 (2006.01) C22B 59/00 (2006.01)

Patent

CA 2047162

RARE EARTH/TRANSITION METAL ALLOY SCRAP TREATMENT METHOD ABSTRACT OF THE DISCLOSURE A method of treating rare earth/transition metal (e.g., iron) alloy scrap involves dissolving the scrap in an aqueous mineral acid solution, reacting the solution of dissolved rare earth metal and transition metal with sufficient excess HF acid to selectively precipitate the rare earth fluoride while retaining the transition metal (e.g., iron) in solution, and then separating the precipitated rare earth fluoride from the solution. The separated rare earth fluoride is dried to render it suitable for use as a reactant salt feedstock in the thermite reduction process or in other metallothermic reduction processes.

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