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(1) [Fe(CN)6]3- in aqueous solution was efficiently removed as Zn2Fe(CN)6 by reducing it with a mixed reducing agent of sulfite and thiosulfate ions (1:1) in the presence of Zn2+. In this process, moreover, trace amounts of Cu2+ were found to accelerate the reduction of [Fe(CN)6]3- markedly owing to a synergistic action with Zn2+.(2) The above process was applied to the removal of the remaining [Fe(CN)6]3- after alkaline chlorination of waste water from cyanide zinc electroplating solutions. As a result, total cyanide concentration was reduced to a level of less than 0.1ppm except when Ni was present, and it was possible to automate the whole operation from alkaline chlorination to the remeval of [Fe(CN)6]3-.(3) The volume of cyanide-bearing sludge produced by the treatment of electroplating waste water containing cyanides can be greatly decreased by the above process involving the reduction of [Fe(CN)6]3- in the vicinity of pH6, followed by separation of the precipitate formed.(4) In processing electroplating waste water containing Ni, the primary alkaline chlorination treatment should be carried out by a batch process to make sure that the destruction of [Ni(CN)4]2- is complete.

Removal by precipitation of the iron cyanide complexes in waste water from cyanide zinc electroplating.