Ultra-high purification of transition metals by anion exchange applying various oxidation states

Tamas Kekesi, Masahito Uchikoshi, Kouji Mimura, Yongfu Zhu, Minoru Isshiki

研究成果: Conference contribution

4 被引用数 (Scopus)

抄録

The formation and anion exchange sorption of chloro complex ions can offer a great potential to be utilized for the separation and purification of metals in aqueous solutions. Available stability data were primarily used to estimate the predominance of chloro complex species, indicating the feasibility of such separations. Anion-exchange sorption functions, describing the equilibrium distribution of a number of important elements have been determined by the batch equilibrating method in the practical HCl concentration range. Various oxidation states were stabilized by the addition of appropriate agents. Tendencies in oxidation, complex formation and anion exchange sorption were confirmed by spectrophotometric investigations. Based on the fundamental results, anion exchange processes have been developed for the purification of iron, cobalt, copper and zinc. The efficiency of separation was assessed and the procedure optimized by the analysis of experimental elution curves. Results have demonstrated that by properly controlling the oxidation states and HCl concentrations, practically all the impurities can be eliminated. Computer programs have been developed to estimate complex formation and redox equilibria, to screen and correct analytical data, to determine distribution coefficients and to evaluate efficiencies of separation.

本文言語English
ホスト出版物のタイトルProceedings of the Second International Conference on Processing Materials for Properties
編集者B. Mishra, C, Yamauchi, B. Mishra, C. Yamauchi
ページ979-984
ページ数6
出版ステータスPublished - 2000
イベントProceedings of the Second International Conference on Processing Materials for Properties - San Francisco, CA, United States
継続期間: 2000 11 52000 11 8

出版物シリーズ

名前Proceedings of the Second International Conference on Processing Materials for Properties

Other

OtherProceedings of the Second International Conference on Processing Materials for Properties
CountryUnited States
CitySan Francisco, CA
Period00/11/500/11/8

ASJC Scopus subject areas

  • Engineering(all)

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