Application of differential bio-flocculation in the removal of hematite and goethite from kaolin and quartz

Mohammad Raouf Hosseini, Ataallah Bahrami, Ali Ahmadi, Mohammad Reza Azizinia, Ebrahim Azimi

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


Differential flocculation acts based upon the difference in the settling rates of two minerals. So, the application of the bacterial cells, spent medium, extracellular protein, and polysaccharide derived from a cell-free extract of Bacillus licheniformis were investigated to remove hematite and goethite from kaolin and quartz. The zeta potentials and settling behaviors of the minerals in the presence and absence of the bioflocculants at various pH values were explored. The adsorption density of each bioflocculant on the minerals was measured and compared relatively, for various pH settings, while the adsorption isotherm of each bioreagent was determined at the neutral pH, as well. Polysaccharide presented the best settling differences at pH 7 that were 66.7%, 58.4%, 53.7%, and 45.4% for the hematite-quartz, goethite-quartz, hematite-kaolin, and goethite-kaolin pairs, respectively. It showed the best ability for the removal of iron oxides at pH 7 (∼76%–84%) with almost 56%–69% separation efficiency, respectively.

Original languageEnglish
Pages (from-to)815-827
Number of pages13
JournalChemical Engineering Communications
Issue number6
Early online date30 Oct 2018
Publication statusE-pub ahead of print - 30 Oct 2018
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2018, © 2018 Taylor & Francis Group, LLC.


  • Bioflocculation
  • Goethite
  • Hematite
  • Kaolin
  • Quartz
  • Separation

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)


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