C - Chemistry – Metallurgy – 01 – G
Patent
C - Chemistry, Metallurgy
01
G
C01G 51/04 (2006.01) B22F 1/00 (2006.01) B22F 9/20 (2006.01) B22F 9/22 (2006.01) B24D 3/06 (2006.01) C01G 51/06 (2006.01) C22C 19/07 (2006.01) H01G 7/06 (2006.01) H01M 4/52 (2006.01)
Patent
CA 2188815
A method of preparing cobalt, metal powder, comprising: (a) reacting a soluble cobalt salt with a solution or suspension of an alkali metal carbonate or hydrogen carbonate, an alkaline earth metal carbonate or hydrogen carbonate, cobalt carbonate or hydrogen carbonate, or ammonium carbonate or hydrogen carbonate in a pH range of 5.5 to 6.8 and at a temperature below 35°C; (b) separating the cobalt carbonate precipitated product of step (a) and washing with water the separated cobalt carbonate precipitated product until the required purity is obtained and drying the washed cobalt carbonate; and (c) reducing the cobalt carbonate product of step (b) to cobalt metal powder. Prior art methods carried out at pH values in the range of from 7.0 to 7.4 result in the Co ions present in the solution being precipitated quantitatively. A disadvantage, however, is that there is a decline in the effectiveness with which the precipitate can be washed, which leads to the increased contents of Na, Ca and S in the end product. In contrast, the process according to the invention is carried out with the pH value being adjusted to less than 6.8. By this means a considerably more effective washing of the precipitate is achieved and hence the impurity content is definitely lowered.
Eikemeyer Knut
Hohne Matthias
Mende Bernd
Fetherstonhaugh & Co.
H.c. Starck Gmbh & Co. Kg
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