UV/visible spectroscopic analysis of CO3+ and CO2+ during the dissolution of cobalt from mixed Co-Cu oxidized ores

J. Ndalamo, A. F. Mulaba-Bafubiandi, B. B. Mamba

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)

Abstract

The leaching of cobalt from four-mixed Co-Cu oxidized ores containing cobalt at levels ranging from 0.5wt% to 34wt% was studied and the results has been reported. Conventional dissolution of these oxidized Co-Cu ores with diluted H2SO4 and SO2 as a reducing agent resulted in a substantial improvement in the solution based recovery of cobalt. UV/visible spectroscopic analysis of the leached solutions indicated that the increased cobalt content in the solution was a result of flushing the acidified cobalt leaching solution with SO2. Furthermore, UV/visible spectroscopy confirmed that as SO2 was flushed into the acidified leaching solution, Co3+ bearing minerals were reduced to the readily soluble Co2+ bearing minerals, and this resulted in the increase of total cobalt in the collected solution. The mechanism of the reduction of Co3+ to Co2+ bearing minerals when SO2 is flushed during the leaching of mixed Co-Cu oxidized ores, including the stability trends of Co3+ to Co2+, and Cu2+ complexes, as shown by their UV/visible spectra, are also discussed.

Original languageEnglish
Pages (from-to)260-269
Number of pages10
JournalInternational Journal of Minerals, Metallurgy and Materials
Volume18
Issue number3
DOIs
Publication statusPublished - Jun 2011

Keywords

  • Cobalt metallurgy
  • Dissolution
  • Leaching
  • Reaction kinetics
  • Spectroscopic analysis

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Geochemistry and Petrology
  • Metals and Alloys
  • Materials Chemistry

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