Effect of reverse flotation on magnetic separation concentrates

S. O. Bada, A. S. Afolabi, M. J. Makhula

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)


Reverse flotation studies on magnetite samples have revealed that the use of starch as a depressant of Fe-oxides has a hydrophilic effect on the surface of Fe-bearing silicates and significantly decreases Fe in the silica-rich stream when used in combination with an amine (Lilaflot D817M). In this study, the effect of reverse flotation on the optimization of products obtained from magnetic separation was investigated. Two different magnetic samples, zones 1 and 2, were milled to <75 μm and then subjected to low intensity magnetic separation (LIMS). The LIMS test conducted on the <75 μm shown an upgrade of 46.40wt% Fe, 28.40wt% SiO 2 and 2.61wt% MnO for zone 1 and 47.60wt% Fe, 29.17wt% SiO 2 and 0.50wt% MnO for zone 2. Further milling of the ore to <25 μm resulted in a higher magnetic-rich product after magnetic separation. Reverse flotation tests were conducted on the agitated magnetic concentrate feed, and the result shows a significant upgrade of Fe compared to that obtained from the non-agitated feed. Iron concentrations greater than 69%, and SiO 2 concentrations less than 2% with overall magnetite recoveries greater than 67% and 71% were obtained for zones 1 and 2, respectively.

Original languageEnglish
Pages (from-to)669-674
Number of pages6
JournalInternational Journal of Minerals, Metallurgy and Materials
Issue number8
Publication statusPublished - Aug 2012

All Science Journal Classification (ASJC) codes

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


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