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Microbial refinement of kaolin by iron-reducing bacteria

Title
Microbial refinement of kaolin by iron-reducing bacteria
Authors
Lee E.Y.Cho K.-S.Wook Ryu H.
Ewha Authors
조경숙
SCOPUS Author ID
조경숙scopus
Issue Date
2002
Journal Title
Applied Clay Science
ISSN
0169-1317JCR Link
Citation
Applied Clay Science vol. 22, no. 1-2, pp. 47 - 53
Indexed
SCI; SCIE; SCOPUS WOS scopus
Document Type
Article
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. © 2002 Elsevier Science B.V. All rights reserved.
DOI
10.1016/S0169-1317(02)00111-4
Appears in Collections:
엘텍공과대학 > 환경공학전공 > Journal papers
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