Process for producing cobalt metal powder

Details Process for producing cobalt metal powder Process for producing cobalt metal powder

1979-05-14

1980-07-29

Ozaki, G.

Specialized metallurgical processes, compositions for use therei

Processes

Electrothermic processes

75119, 423143, C22B 2304

Patent

active

042148960

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) adding NaOH to the mother liquor containing cobalt species in solution, to form a cobalt-containing precipitate; and (b) 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.

REFERENCES:
patent: 2826499 (1958-03-01), Schlecht et al.
patent: 2879137 (1959-03-01), Bare et al.
patent: 3928530 (1975-12-01), Bakker et al.
patent: 3933976 (1976-01-01), Nikolic et al.
patent: 4093450 (1978-06-01), Doyle et al.
patent: 4108640 (1978-08-01), Wallace et al.

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