Specialized metallurgical processes – compositions for use therei – Processes – Free metal or alloy reductant contains magnesium
Patent
1992-06-30
1993-08-24
Rosenberg, Peter D.
Specialized metallurgical processes, compositions for use therei
Processes
Free metal or alloy reductant contains magnesium
C01G 500
Patent
active
052384896
ABSTRACT:
A method of treating a mixture of Nd.sub.2 Fe.sub.14 B and SmCo.sub.5 alloy scrap or waste particulates wherein the mixture is introduced to a bath of sulfuric acid solution to selectively dissolve the Nd.sub.2 Fe.sub.14 B alloy particulates, leaving a majority of the SmCo.sub.5 alloy particulates undissolved. Hydrogen bubbles are generated in the bath by dissolution of the Nd.sub.2 Fe.sub.14 B alloy particulates. The undissolved SmCo.sub.5 alloy particulates adhere to the hydrogen bubbles are floated to the bath surface to form a froth containing a concentrate of the SmCo.sub.5 alloy particulates, which are recovered by removing the concentrate from the bath surface. The bath is treated to recover the Nd metal of the dissolved Nd.sub.2 Fe.sub.14 B alloy particulates. Any grinding media present in the mixture settles to the bottom of the bath to further upgrade the recovered alloy product.
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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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