Chemistry of inorganic compounds – Treating mixture to obtain metal containing compound – Iron group metal
Patent
1974-07-11
1976-09-21
Vertiz, Oscar R.
Chemistry of inorganic compounds
Treating mixture to obtain metal containing compound
Iron group metal
75101BE, C01G 5110, C01G 5300
Patent
active
039819680
ABSTRACT:
An ammoniacal solution containing nickel and cobalt is contacted with an extractant comprising an oxime or oxine compound dissolved in an organic diluent to selectively extract the nickel into the organic phase while leaving most of the cobalt in the aqueous ammoniacal phase from which it is subsequently recovered. The nickel-loaded organic extract is washed with water and aqueous carbon dioxide to remove and recover ammonia which undesirably transfers to the organic phase during the extraction. The ammonia-free, nickel-loaded extract is then stripped with aqueous sulfuric acid at low temperature to remove the nickel. The ammonia-free nickel sulfate solution produced in the stripping operation is particularly suitable for recovering the nickel by electrolytic deposition. The stripped organic extract is further stripped with aqueous sulfuric acid at high temperature to remove and recover the small amount of cobalt which transfers to the organic phase during extraction and hampers reuse of the organic extractant in the process. Removal of the cobalt permits recycle of the extractant to the process.
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Evans et al, Editors "International Symposium on Hydrometallurgy," Chicago, Ill. 2/25 to 3/1/73; A.I.M.M.E. Inc. New York 1973, pp. 559,562,563,571,572,575.
Miller David J.
Wiewiorowski Tadeusz K.
Freeport Minerals Company
Hearn Brian E.
Schapira Ronald A.
Vertiz Oscar R.
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