FIELD: nonferrous metallurgy. SUBSTANCE: more specifically, invention concerns processing slag formed in the secondary smelting of heavy nonferrous metals. Method includes flotation to produce useful component and zinc-containing material, grinding the latter at solids to liquid ratio 1: (0.5-1) until 80% content of 0.044 mm fraction is attained while simultaneously feeding alkali metal hydroxide solution, leaching, separation of solution from residue, purification of solution, and isolation zinc from solution. EFFECT: increased zinc recovery and enabled isolation of other components of material being processed. 1 tbl
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