Chemistry of inorganic compounds – Treating mixture to obtain metal containing compound – Iron group metal
Patent
1980-07-18
1982-02-09
Hearn, Brian E.
Chemistry of inorganic compounds
Treating mixture to obtain metal containing compound
Iron group metal
423146, 423150, 423 24, C01G 5310
Patent
active
043149766
ABSTRACT:
A process is provided for purification of nickel sulfate via ammoniacal leaching and pH regulated solvent-extraction, while providing for regeneration of the extractant and the leach solution. The process is especially suited for hydrometallurgical extraction of high purity nickel sulfate from residue resulting in the regeneration of spent electrolyte in the electrorefining of secondary copper. According to the process, the starting material is leached in an ammonia solution of selected pH to solubilize the nickel as polyammine sulfate, followed by extracting the solubilized nickel by pH regulated solvent-extraction. The extractant is then stripped and regenerated with sulfuric acid by first scrubbing in a first pH range to remove ions that are more electropositive than nickel, then stripping with sulfuric acid in a second pH range to remove nickel ions, and then regenerating the extractant by stripping in a third pH range to remove ions that are less electropositive than nickel. Finally, high purity nickel sulfate is crystallized from the nickel-loaded stripping solution. Further, the spent ammonia leach solution is preferably regenerated.
REFERENCES:
patent: 3794719 (1974-02-01), Lowenhaupt
patent: 4036639 (1977-07-01), Yurko
Rhoads et al. in Proceedings, I.S.E.C. 1977, vol. 2, C.I.M. (1979) pp. 446-452.
Siemens et al, Mining Congress Journal, Jan. (1977), pp. 29-34.
Forward et al. in Journal of Metals, Mar. 1955, pp. 2-8.
Engineering/Mining Journal, Jan. 1972, pp. 94, 95.
Eliasen, "The S.E.C. Process", CIM Bulletin, Feb. 1974, pp. 82-86.
Brunson William W.
Odle Robert R.
Stewart Maxson L.
Hanegan Herbert M.
Hearn Brian E.
Linne Robert Steven
Peacock Frank A.
Southwire Company
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