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

DOI

Bibliographic Information

Other Title
  • シアン化亜鉛めっき排水中の鉄シアノ錯体の沈殿除去

Search this article

Description

(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+.<br>(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-.<br>(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.<br>(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.

Journal

Details 詳細情報について

  • CRID
    1390282679089201152
  • NII Article ID
    130003810052
  • DOI
    10.4139/sfj1950.37.137
  • ISSN
    18843395
    00260614
  • Text Lang
    ja
  • Data Source
    • JaLC
    • Crossref
    • CiNii Articles
  • Abstract License Flag
    Disallowed

Report a problem

Back to top