Preparation of high-purity cobalt

K. Mimura, M. Uchikoshi, T. Kekesi, M. Isshiki

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

A process consisting of anion exchange in a hydrochloric acid solution, electrowinning, plasma arc melting and electron beam melting of electrolytic cobalt has been developed for preparing high-purity cobalt. Glow discharge mass spectrometry (GDMS) and residual resistivity ratio (RRR) were applied for analysis and purity evaluation of the produced cobalt. Almost all the metallic impurities except for copper were removed efficiently and reduced to lower than 1 mass ppm by the anion exchange step. Electron beam melting at a final step was very useful for removal of copper by vaporization from the molten cobalt and the copper concentration could be lowered to below 1 mass ppm. As a result, high-purity cobalt with above 99.9995% in purity (RRR = 210) was produced by this practical purification process.

Original languageEnglish
Pages (from-to)127-133
Number of pages7
JournalMaterials Science and Engineering A
Volume334
Issue number1-2
DOIs
Publication statusPublished - Sep 1 2002

Keywords

  • Anion exchange
  • Glow discharge mass spectrometry(GDMS)
  • High-purity cobalt
  • Melting
  • Purification
  • Residual resistivity ratio (RRR)
  • Trace impurity

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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