Liquid-liquid extraction of metal values from aqueous solution

C - Chemistry – Metallurgy – 22 – B

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C22B 3/00 (2006.01) C01G 3/00 (2006.01) C01G 51/00 (2006.01) C22B 3/36 (2006.01) C22B 15/00 (2006.01)

Patent

CA 1076816

ABSTRACT OF THE DISCLOSURE Optionally substituted compounds of the formula Image wherein R is a hydrogen atom or a methyl, ethyl or vinyl group, and X is an atom of oxygen or sulphur, a group -CH=CH- or a group NR5 wherein R5 is an aliphatic or cycloaliphatic group, and containing at least 5 alkyl, alkenyl or cycloalkyl carbon atoms extract metals from aqueous solutions of their salts into water-immiscible organic solvents in presence of halide ion. Benzimidazoles having a branched-chain alkyl group of at least 7 carbon atoms in position 1, and especially mixtures of such compounds, are most effective. The benzimidazoles are particularly useful for extracting cobalt selectively from mixtures of cobalt and nickel salts. The metals can be recovered from the organic solvent by extraction into water free from halide ion.

253910

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