Chemistry of inorganic compounds – Treating mixture to obtain metal containing compound – Iron group metal
Patent
1975-05-19
1976-08-17
Carter, Herbert T.
Chemistry of inorganic compounds
Treating mixture to obtain metal containing compound
Iron group metal
423143, C01G 5100, C01G 5312
Patent
active
039754979
ABSTRACT:
An ammoniacal solution containing nickel and cobalt dissolved as nickel-ammonia complexes and cobalt-ammonia complexes is treated with a material capable of providing free ammonia in the solution, such as gaseous ammonia or aqueous ammonia, in order to increase the proportion of higher nickel-ammonia complexes to lower nickel-ammonia complexes in solution until at least about 85% of the dissolved nickel is in the form of higher nickel-ammonia complexes, i.e., complexes in which the number of NH.sub.3 molecules is greater than 3. The attainment of this high concentration of higher nickel-ammonia complexes is readily determined by various analytical procedures such as, for example, free ammonia electrode measurements and spectrophotometer measurements. The solution is then treated with a sulfiding agent in an amount sufficient to selectively precipitate out the dissolved cobalt as cobalt sulfide. The resulting slurry is separated into a nickel-enriched liquid fraction and a cobalt-enriched solids fraction. Surprisingly, when the dissolved nickel is present as a higher ammonia complex, less tends to undesirably coprecipitate with the cobalt during sulfiding. The highly desirable result is a precipitate containing up to 50% more cobalt and 20% less nickel, and a mother liquor more enriched in nickel, than normally obtained in a conventional selective sulfiding.
REFERENCES:
patent: 3088803 (1963-05-01), Mackiw et al.
patent: 3720750 (1973-03-01), Wiewiorowski et al.
patent: 3821354 (1974-06-01), Gandon et al.
bjerrum, J., Metal Ammine Formation in Aqueous Solution, P. Haase & Son, Copenhagen, (1941), pp. 180-198.
Miller David J.
Wiewiorowski Tadeusz K.
Carter Herbert T.
Freeport Minerals Company
Hearn Brian E.
Schapira Ronald A.
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