Journal
APPLIED CLAY SCIENCE
Volume 48, Issue 3, Pages 379-383Publisher
ELSEVIER
DOI: 10.1016/j.clay.2010.01.010
Keywords
Kaolin; Nutrients; Bioleaching; Iron; Characterization
Funding
- Fujian Normal University
- Science Technology Commission of the Fujian Province of China [2008H0021]
- Longyan Kaolin Company, P. R. China
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This paper studied the effects of different carbon and nitrogen sources on the removal of iron impurities from kaolin using dissimilatory Fe(III)-reducing bacteria (DIRB). Iron impurities in the kaolin were removed using glucose, sucrose, food-sugar, maltose and soluble starch as different carbon sources with removal efficiencies in the order: monosaccharide>disaccharide>polysaccharide. More than 50% of the iron impurities were removed from kaolin with an increase of whiteness index from 61% to 82% at 5% (mass/mass) of food-sugar, indicating that food-sugar could alternatively be used as a bulk carbon source to reduce the operational cost of bioleaching. Addition of (NH4)(2)SO4 to the bioleaching medium accelerated the bioleaching rate. The samples before and after bioleaching were examined by X-ray diffraction (XRD), X-ray fluorescence analysis (XRF) and scanning electron microscope (SEM). Iron was selectively leached from the kaolin without formation of a secondary mineral phase, structural changes were not observed but the crystallinity was improved. (C) 2010 Elsevier B.V. All rights reserved.
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