Bacillus licheniformis a potential bio-collector for Barite-Quartz selective separation

Rasool Abedi Ashkavandi, Ebrahim Azimi, Mohammad Raouf Hosseini

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)


Employing microorganisms and their metabolites as a potentially low-cost and environmentally friendly alternative for the synthetic compounds in many of the current mineral beneficiation techniques is receiving increasing attention. For the first time, the influence of the Bacillus licheniformis cells and its metabolites for selective flotation of barite from quartz was studied. The maximum adsorption density of 1.33 × 1010 cells/g was achieved at pH = 3 for barite, six times higher than quartz. Flotation experiments revealed that cell-assisted separation was more effective than metabolite-facilitated flotation, either for single mineral or the mixed sample (barite mixed with quartz). Barite was recovered up to 87% (at pH = 3) in sole-mineral flotation experiments, and flotation of the mixed sample, also, proved a successful selective separation of barite (76% recovery) from quartz at the bio-collector dosage of 6.55 × 103 cells/ml. Adsorption kinetics study showed that the pseudo second-order model could represent cell adsorption densities for both minerals, while the Langmuir model simulated adsorption isotherms. Finally, it was shown that B. licheniformis cells could selectively enhance particles hydrophobicity and successfully be utilized as a bio-collector.

Original languageEnglish
Article number107285
Number of pages10
JournalMinerals Engineering
Early online date8 Nov 2021
Publication statusPublished - 1 Jan 2022
Externally publishedYes


  • Bio-flotation
  • Adsorption
  • Isotherms
  • Kinetics
  • Barite
  • Quartz

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Chemistry(all)
  • Geotechnical Engineering and Engineering Geology
  • Mechanical Engineering


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