Biological separation of quartz from kaolinite using Bacillus licheniformis

Mohammad Raouf Hosseini, Seyed Mohammad Sadeghieh, Mohammad Reza Azizinia, Seyed Hassan Tabatabaei

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)


Separation of quartz and kaolinite was examined in the absence and presence of the cells and extracellular polymeric substances (EPS) of Bacillus licheniformis in alkaline conditions. The adsorption density of EPS and bacterial cells on kaolinite increased by raising the pH value from 9 to 12, whereas for quartz the trend was in reverse. The highest difference between the settling rates of two minerals happened at pH = 12, 11, and 10 using no bio-reagents, bacterial cells, and EPS, respectively. The mineral separation tests indicated that using the bacterial cells, 98.3% of kaolinite was recovered, and quartz content was reduced by 8%.

Original languageEnglish
Pages (from-to)2061-2071
Number of pages11
JournalSeparation Science and Technology (Philadelphia)
Issue number11
Early online date17 May 2019
Publication statusPublished - 23 Jul 2020
Externally publishedYes


  • Bacillus licheniformis
  • bioflocculation
  • kaolin
  • polysaccharide
  • quartz

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Process Chemistry and Technology
  • Filtration and Separation


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