Process for separating and recovering nickel and cobalt

Details Process for separating and recovering nickel and cobalt Process for separating and recovering nickel and cobalt

1974-08-06

1977-01-25

Andrews, R. L.

Chemistry: electrical and wave energy

Processes and products

Electrostatic field or electrical discharge

75101BE, 75101R, 75119, 75139, 423 43, 423 48, 423 50, 423139, C25C 108, C22B 300

Patent

active

040049906

ABSTRACT:
A process for separating and recovering nickel and cobalt is provided wherein a sulfide material containing cobalt and nickel is first oxidation-roasted to remove volatiles and to convert the metallic values into their oxides. These oxides are then dissolved in an aqueous solution of HCl. The solution of chloride salts thus produced is contacted with an extraction solvent comprising an admixture of trinormaloctylamine and xylene whereby the bulk of the cobalt along with the iron, copper and zinc impurities and a portion of the manganese impurities present in the original material are stripped by the extraction solvent while the bulk of the nickel and the remainder of the manganese impurities remain in the aqueous phase. The aqueous phase containing the nickel and manganese impurities is treated with chlorine gas and nickelous carbonate whereby the manganese is precipitated as manganese dioxide. The nickelous chloride solution is then subjected to electrolysis to produce metallic nickel. The extraction solvent containing the cobalt and iron, zinc, copper and manganese impurities is contacted with water in an extraction stage and the cobalt along with the manganese impurities and a portion of the copper impurities are stripped by the water while the iron and zinc impurities and a portion of the copper impurities remain in the extraction solvent. The water containing the cobalt and copper and manganese impurities is first treated with H.sub.2 S to precipitate the copper as copper sulfide and then with chlorine gas and cobaltous carbonate to precipitate the manganese as manganese dioxide. The remaining cobaltous chloride solution is then subjected to electrolysis to produce metallic cobalt.

REFERENCES:
patent: 2992894 (1961-07-01), Hazen et al.
patent: 3085054 (1963-04-01), Thornhill
patent: 3128156 (1964-04-01), Long et al.
patent: 3455680 (1969-07-01), Ashbrook et al.
patent: 3809624 (1974-05-01), Kane et al.
patent: 3824161 (1974-07-01), Aue et al.
patent: 3887679 (1975-06-01), Wigstol et al.
patent: 3903235 (1975-09-01), Cardwell et al.
"Extraction of Sb w. Tertiary Amines" by Alian et al., Talanta, 1967, vol. 14, pp. 659, 668.

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