Anion exchange for the ultra-high purification of transition metals

Tamas Kekesi, Minoru Isshiki

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Ultra high purity metals - considered as new functional materials - are increasingly demanded in advanced technology. Satisfactory purification by the conventional technique requires a combination of complicated and inefficient procedures. Application of a relatively new method of purification by anion exchange separations in a complexing medium may offer substantial advantages. Hydrochloric acid is a suitable medium, which leaves no residual impurities behind in the extracted metal after the final melting step and it magnifies the differences among the dissolved elements by the effect of complex formation. Stability and anion exchange distribution of the formed complex species have been examined by equilibrating experiments, computer simulation and spectrophotometry. Based on laboratory scale experiments, procedures have been devised and tested for the ultra high purification of iron, cobalt, copper and zinc. Concentration of HCl and the oxidation states of the elements were the major parameters to be controlled during the separations.

Original languageEnglish
Pages (from-to)59-67
Number of pages9
JournalErzmetall: Journal for Exploration, Mining and Metallurgy
Volume56
Issue number2
Publication statusPublished - Jan 1 2003

Keywords

  • Anion exchange
  • Chloride media
  • Complex ions
  • Purification
  • Ultra-high purity

ASJC Scopus subject areas

  • Geotechnical Engineering and Engineering Geology

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