Process for preparing cobalt metals using nitrogen reductant

Details Process for preparing cobalt metals using nitrogen reductant Process for preparing cobalt metals using nitrogen reductant

1998-09-04

1999-10-19

Wyszomierski, George

Specialized metallurgical processes, compositions for use therei

Processes

Free metal or alloy reductant contains magnesium

75430, 423138, C22B 2300, C22B 1500, C01G 100

Patent

active

059682280

ABSTRACT:
The present invention relates to a process for preparing cobalt metals by reducing cobalt oxides with ammonia or nitrogen/hydrogen gas mixtures. In accordance with the present invention, a cobalt metal is economically prepared by reacting a cobalt oxide with a nitrogen reductant at a temperature of 300 to 550.degree. C. for 3 to 7 hours, where the nitrogen reductant is injected into a reactor containing the cobalt oxide at a flow rate of 300 to 700 cc/min, preferably 500 cc/min per 1 g of cobalt oxide, while continuously elevating the temperature of the reactor at a rate of 3 to 7.degree. C./min, most preferably 5.degree. C./min.

REFERENCES:
patent: 4093450 (1978-06-01), Doyle et al.
patent: 4452633 (1984-06-01), Miller et al.
patent: 4612039 (1986-09-01), Scheithauer et al.

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