The Effect of Tetrathionate Ions on the Surface Chemistry and Flotation Response of Selected sulphide Minerals

Ngoni Mhonde*, Leena-Sisko Johansson, Kirsten Corin, Nora Schreithofer

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

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Abstract

This study investigated the impact of tetrathionate ions on selected sulfide mineral surfaces and their flotation response to tetrathionates using X-ray photoelectron spectroscopy (XPS), zeta potential and batch flotation studies and linking the results to previously reported electrochemistry, FTIR and microflotation studies. XPS revealed that tetrathionates have the propensity to oxidize minerals, changing the chemical composition of the mineral surface. This surface alteration renders the sulfide minerals hydrophilic through sulphoxy and hydroxy entities reducing collector adsorption as noted in FTIR and mixed potential studies. Zeta potentials showed little specific adsorption of tetrathionates on the sulfides except at moderately high concentrations, i.e., 1000 mg/L. Batch flotation showed that tetrathionates in solution depressed sulfide minerals, particularly galena, reducing its recovery to the concentrates in support of earlier microflotation results.

Original languageEnglish
Number of pages14
JournalMineral Processing and Extractive Metallurgy Review
Early online date8 Dec 2021
DOIs
Publication statusE-pub ahead of print - 8 Dec 2021
MoE publication typeA1 Journal article-refereed

Keywords

  • Mineral oxidation
  • zeta potential
  • recovery
  • tetrathionates
  • batch flotation
  • rest potentials
  • XANTHATE ADSORPTION
  • GALENA SURFACES
  • FROTH STABILITY
  • ETHYL XANTHATE
  • ORE FLOTATION
  • PROCESS WATER
  • CHALCOPYRITE
  • XPS
  • PYRITE
  • OXIDATION

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