FIELD: chemistry.
SUBSTANCE: invention relates to an ore processing reagent which contains alkylhydroxamic acid of formula: R-C(=O)N(R")-OM, where R denotes a straight or branched C2-C18 alkyl, R" denotes H and M denotes hydrogen, and a nonionic surfactant selected from a group comprising ethoxylated alcohols, esters, ethoxylated acids, ethoxylated (alkyl)phenols, alkanoylamides, copolymers of polyethyleneoxide and mixtures thereof, where the weight ratio of the nonionic surfactant to the alkylhydroxamic acid is between 1:20 and 1:1, as well as to methods for selective separation of impurities.
EFFECT: more efficient processing.
34 cl, 13 ex, 1 tbl
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