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Reprocessing of zinc galvanic waste sludge by selective precipitation

Ceramics (Praha), 2002-01, Vol.46 (2), p.52-55 [Peer Reviewed Journal]

2003 INIST-CNRS ;ISSN: 0862-5468

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  • Title:
    Reprocessing of zinc galvanic waste sludge by selective precipitation
  • Author: JANDOVA, Jitka ; MAIXNER, Jaroslav ; GRYGAR, Tomas
  • WCA
  • Subjects: Applied sciences ; Exact sciences and technology ; Other industrial wastes. Sewage sludge ; Pollution ; Wastes
  • Is Part Of: Ceramics (Praha), 2002-01, Vol.46 (2), p.52-55
  • Description: This method involved acid leaching of sludge in sulphuric acid, purification of sulphate leach liquors using a sequence of hydroxide, sulphide, and fluoride precipitation to remove trivalent metals, Cu, Cd, Ca, Mg, and Si, oxidative precipitation to remove Mn, and finally precipitation of Zn as zinc carbonate. The solids were separated from leach liquors after each precipitation step, and their phase composition was determined by XRD powder and elemental composition by AAS. The flowsheet proposed yielded relatively pure Zn-precipitate, suitable for possible production of raw materials for the ceramic, metallurgical, or pigment industry, but due to incomplete leaching of the sludge and co-precipitation of Zn to hydroxides of trivalent metals and Cu, Cd-sulphides, the overall recovery efficiency was only 63-65%. 11 refs.
  • Publisher: Praha: Ústav chemie skelných a keramických materiálů ČSAV
  • Language: English
  • Identifier: ISSN: 0862-5468
  • Source: Directory of Open Access Journals
    Alma/SFX Local Collection
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