Purification of nickel and cobalt metal powders by a caustic was

Details Purification of nickel and cobalt metal powders by a caustic was Purification of nickel and cobalt metal powders by a caustic was

1978-03-06

1979-04-17

Ozaki, G.

Specialized metallurgical processes, compositions for use therei

Processes

Electrothermic processes

75 05AA, 75108, 75109, 75119, 252477Q, C22B 2300

Patent

active

041498755

ABSTRACT:
A method is provided for decreasing the silicon content of relatively pure nickel and/or cobalt powder, wherein silicon is present as an impurity substantially in the oxidic state. The method comprises mixing the metal powder in an aqueous solution of an alkali metal hydroxide, e.g. sodium hydroxide, with the temperature of the solution ranging from ambient to below boiling and maintaining the powder in contact with the solution until the silicon content of the powder has been reduced to the desired level.

REFERENCES:
patent: 2257800 (1941-10-01), Howk
patent: 2388959 (1945-11-01), Drew
patent: 2583619 (1952-01-01), White
patent: 2753257 (1956-07-01), Nashner et al.

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