Production of metallic powder

Details Production of metallic powder Production of metallic powder

1992-10-26

1993-09-21

Dean, R.

Specialized metallurgical processes, compositions for use therei

Processes

Producing or purifying free metal powder or producing or...

423139, C22B 2304

Patent

active

052464814

ABSTRACT:
A process for the production of powdered metallic cobalt by reduction of cobaltous ammonium sulphate solutions. A soluble silver salt, preferably silver sulphate, is added in an amount to provide a soluble silver to cobalt weight ratio in the range of 1 to 10 g silver:1 kg cobalt, an organic dispersant such as bone glue or polyacrylic acid, or mixture thereof, is added in an amount of 0.01. to 2.5% of the weight of the cobalt, an ammonia to cobalt mole ratio of about 1.5:1 to 3.0:1 is established, and the solution is heated to a temperature in the range of 150 to 250.degree. C., preferably about 175.degree. C., with agitation under a hydrogen pressure of 2500 to 5000 kPa for a time sufficient to reduce the cobaltous sulphate to cobalt metal powder.

REFERENCES:
patent: 2767081 (1956-10-01), Mackin et al.
patent: 2853374 (1958-09-01), Schaufelberger
patent: 3775098 (1973-11-01), Kunda et al.
patent: 4761177 (1988-08-01), Chou et al.
Schoening, M. A. et al "The Role of Chemical Engineering in Development of the Sherritt Gordon Nickel Refining Operation", Chemical Engineering Conference, Montreal, Apr. 22, 1958.

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