Method for producing fine cobalt metal powder

Details Method for producing fine cobalt metal powder Method for producing fine cobalt metal powder

1986-02-28

1987-11-10

Rosenberg, Peter D.

Specialized metallurgical processes, compositions for use therei

Processes

Electrothermic processes

C22B 2304

Patent

active

047055596

ABSTRACT:
A method is disclosed for producing fine cobalt metal powder. The method involves digesting a cobaltic ammine halide in an aqueous solution with a mineral acid at a temperature of at least about 110.degree. C. for a sufficient time to decompose the cobaltic ammine halide to form an amorphous hydrated cobalt oxide containing precipitate. The digestion step is carried out at a suitable pressure in a sufficiently closed vessel to permit the temperature to be attained in the solution. The aqueous solution of the cobaltic ammine halide contains from about 5 grams of cobalt per liter up to the limits of solubility of the cobaltic ammine halide. The mineral acid is present in an amount sufficient to result in the subsequent cobalt metal powder having a Fisher Subsieve Size of no greater than about 2.1. The cobalt containing precipitate is separated from the resulting solution and reduced to form the fine cobalt powder.

REFERENCES:
patent: 4214895 (1980-07-01), Gingerich
patent: 4329169 (1982-05-01), Gingerich
patent: 4395278 (1983-07-01), Vanderpool

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