FIELD: chemistry.
SUBSTANCE: invention relates to a method of extracting copper (II), nickel (II) and/or cobalt (II) ions from weakly acidic and aqueous ammonia solutions with an organic reagent, followed by re-extraction with aqueous solution of a mineral acid. The organic reagent used is N',N'-dimethylhydrazides of α-branched tertiary carboxylic acids of general formula (I) 
where R1 and R2 are aliphatic radicals with a branched chain, containing 9-18 carbon atoms.
EFFECT: method provides compatibility with hydrocarbon solvents in any ratios, is characterised by high copper capacity of the organic phase, low effect of content of ammonia and ammonia salts on the degree of extraction of metal ions and can be used in hydrometallurgy of non-ferrous metals.
10 cl, 1 dwg, 8 tbl, 10 ex
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