Specialized metallurgical processes – compositions for use therei – Processes – Electrothermic processes
Patent
1979-05-14
1980-07-29
Ozaki, G.
Specialized metallurgical processes, compositions for use therei
Processes
Electrothermic processes
75119, 423143, 423139, C22B 2304
Patent
active
042148944
ABSTRACT:
A method for producing extra fine cobalt metal powder (up to 1.7 FSSS) by the digestion of cobalt pentammine chloride in a dilute ammonium hydroxide solution to form a cobalt-containing precipitate, followed by reducing the precipitate in a hydrogen atmosphere to cobalt metal powder, is improved by: (a) treating the mother liquor with an ion exchange resin to remove cobalt species; (b) stripping the resin with an HCl solution; (c) recovering solid cobalt hexammine chloride from the stripping solution; (d) forming a solution of the solid in water; (e) adding NaOH to the solution to form a cobalt-containing precipitate; and (f) either heating the precipitate in hydrogen to reduce it to cobalt metal powder or recycling the precipitate as a cobalt source for the formation of cobalt pentammine chloride. The final cobalt metal powder is useful, for example, as a starting material in the manufacture of cemented carbides.
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Acla Howard L.
Gingerich Richard G. W.
Ritsko Joseph E.
Fox John C.
GTE Products Corporation
Ozaki G.
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