Alkali metal mercaptide solvent extraction of cobalt, nickel

Details Alkali metal mercaptide solvent extraction of cobalt, nickel Alkali metal mercaptide solvent extraction of cobalt, nickel

1977-09-08

1979-04-10

Hearn, Brian

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

423139, 423149, 423418, 75101BE, C07F 1504, C07F 1506

Patent

active

041488164

ABSTRACT:
A novel class of extractants and a method of using the extractants in the hydrometallurgical recovery of nickel and cobalt metal. The extractants comprise a water immiscible organic solvent system containing solubilized mercaptide anions. In an important embodiment of the invention, the mercaptide anions are generated by solubilizing an alkali metal mercaptide in a polar organic solvent capable of solvating alkali metal ions. Alternatively, an organic solution of a mercaptan is exposed to an aqueous solution of NaOH or KOH to produce the mercaptide anion.
The extractants are used by being contacted with cobalt, nickel, or cobalt and nickel pregnant aqueous solutions. On mixing, the cobalt and/or nickel values are taken up by the organic as cobalt or nickel mercaptides. These may then be stripped of cobalt and nickel by treatment with an aqueous alkaline solution and carbon monoxide.

REFERENCES:
patent: 2186398 (1940-01-01), Yabroff
patent: 3663624 (1972-05-01), Jones
Clingman, A. et al., "Selective Liquid Ion-Exchangers" J. Appl. Chem. May 13, 1963, pp. 193-198.
Mehrotra, R. et al., "Thiol and Thio-.beta.-Diketone Derivatives of Some Elements" Inorganica Chemica Acta Reviews, 1968, pp. 111-116.
Swan, C. et al., "Complexes of Co, Ni, Tl, Pd with Some Mercapto Compounds" Chemistry and Industry, 8/12/67, pp. 1363, 1364.

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