Specialized metallurgical processes – compositions for use therei – Processes – Producing or treating free metal
Patent
1990-10-24
1992-07-14
Rosenberg, Peter D.
Specialized metallurgical processes, compositions for use therei
Processes
Producing or treating free metal
423263, C01F 1700
Patent
active
051299453
ABSTRACT:
A method of treating rare earth-transition metal alloy scrap involves in one embodiment dissolving the scrap in aqueous sulfuric acid solution, reacting the solution with a hydroxide of an alkali element (e.g., Na or K) or ammonium to precipitate a double sulfate salt of the rare earth and the alkali element or ammonium, and separating the salt from the solution. The double sulfate salt is converted to a rare earth salt, such as rare earth fluoride, amenable for use in metallothermic reduction processes to make rare earth metal or alloys.
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Lyman Jane W.
Palmer Glenn R.
Rosenberg Peter D.
The United States of America as represented by the Secretary of
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