Specialized metallurgical processes – compositions for use therei – Processes – Producing or purifying free metal powder or producing or...
Patent
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.
Dean R.
Fors Arne I.
Horne D. Doak
Ip Sikyin
Sherritt Gordon Limited
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