Microbial refinement of kaolin by iron-reducing bacteria

Eun Young Lee, Kyung Suk Cho, Hee Wook Ryu

Research output: Contribution to journalArticlepeer-review

61 Scopus citations

Abstract

Low-grade kaolin contains Fe(III) impurities, which cause the detraction of refractoriness and whiteness of porcelain and pottery. Microbial refinement of low-grade kaolin to remove Fe(III) by iron-reducing bacteria was investigated. The removal of Fe(III) impurities could be performed by the indigenous microorganisms in kaolin, but could be enhanced by the inoculation of iron-reducing bacteria. Maltose, sucrose, and glucose could be used as substrates. The removal efficiency of Fe(III) increased with increasing sugar concentrations in the range of 1-5% (w/w, sugar/clay). After the microbial refinement, the whiteness of the kaolin increased from 64.49 to 71.50, and the redness decreased remarkably from 7.41 to 2.55. Fe(III) impurities were selectively removed from the kaolin without changing or losing the mineralogical composition of the kaolin by the microbial refinement.

Original languageEnglish
Pages (from-to)47-53
Number of pages7
JournalApplied Clay Science
Volume22
Issue number1-2
DOIs
StatePublished - Nov 2002

Keywords

  • Clay refinement
  • Iron-reducing bacteria
  • Kaolin
  • Microbial iron removal

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