Amino-thiol nickel and cobalt solvent extraction

Details Amino-thiol nickel and cobalt solvent extraction Amino-thiol nickel and cobalt solvent extraction

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

041488156

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 anion. In an important embodiment of the invention, the mercaptide anions are generated by adding compounds containing both a thiol group and an amine group such as aminoethanethiols or amides of thioglycolic acids to water immiscible organic solvents, preferably of polar character. These systems generate the required mercaptide anions by undergoing an internal acid dissociation.
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 and nickel mercaptides. These may then be stripped of cobalt and nickel by treatment with an aqueous alkaline solution and carbon monoxide.

REFERENCES:
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patent: 3335054 (1967-08-01), Reynolds et al.
patent: 3369876 (1968-02-01), Grimm
Belcher et al., New Methods of Analytical Chemistry, 2nd Edition, Reinhold Pub. Corp., N.Y. (1964), p. 254.
Marcus et al., Ion Exchange and Solvent Extraction of Metal Complexes, Wiley-Interscience, NY (1969), pp. 94-96, 927, 928, 932, 933.
Mehrotra, R. et al., "Thiol and Thio-.beta.-Diketone Derivatives of Some Elements," Inorganic Chimica 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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