Use of catalytic anodes for zinc electrowinning at high current densities from purified electrolytes

M. Bestetti, U. Ducati, G. H. Kelsall, G. Li, E. Guerra

    Research output: Contribution to journalArticle

    17 Citations (Scopus)

    Abstract

    Substantial energy savings are possible in zinc electrowinning by substituting catalytic oxygen evolution anodes for conventional lead-silver anodes. However, it is well known that the harmful effects of impurities usually present in zinc electrolyte solutions limit the service life of catalytic anodes, though their purification by solvent extraction could obviate such problems. Laboratory scale zinc deposition experiments with synthetic electrolytes have been performed to determine the effects of current density, temperature and electrolyte composition on cell voltages and current efficiencies. These data sets were used in an assessment of the optimum design parameters of the tank house. Zinc electrowinning at high current densities (higher than 2000 A/m2) using catalytic anodes and purified solutions (by solvent extraction) is proposed as an alternative to the conventional process, which is based on lead-silver anodes working at relatively low current densities (ca. 500 A/m2). Finally, a system for continuous deposition and stripping of the metal is discussed.

    Original languageEnglish
    Pages (from-to)451-458
    Number of pages8
    JournalCanadian Metallurgical Quarterly
    Volume40
    Issue number4
    DOIs
    Publication statusPublished - Oct 2001

    ASJC Scopus subject areas

    • Metals and Alloys
    • Industrial and Manufacturing Engineering

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