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Removal of Fe from Kaolin using Dissimilatory Fe(III)-Reducing Bacteria

Published online by Cambridge University Press:  01 January 2024

Min-Rong Guo ,
Qiu-Xiang He ,
Yu-Man Li ,
Xiao-qiao Lu  and
Zu-liang Chen
Min-Rong Guo
Affiliation:
School of Chemistry and Materials Science, Fujian Normal University, Fuzhou 350007, Fujian Province, China
Qiu-Xiang He
Affiliation:
School of Chemistry and Materials Science, Fujian Normal University, Fuzhou 350007, Fujian Province, China
Yu-Man Li
Affiliation:
School of Chemistry and Materials Science, Fujian Normal University, Fuzhou 350007, Fujian Province, China
Xiao-qiao Lu
Affiliation:
School of Chemistry and Materials Science, Fujian Normal University, Fuzhou 350007, Fujian Province, China
Zu-liang Chen*
Affiliation:
School of Chemistry and Materials Science, Fujian Normal University, Fuzhou 350007, Fujian Province, China
*
* E-mail address of corresponding author: zlchen@fjnu.edu.cn
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Abstract

LongYan kaolin has a large Fe content which affects the coloring. Bioleaching treatments to remove Fe impurities were conducted here using indigenous dissimilatory Fe(III)-reducing bacteria. The factors that affect bioleaching efficiency include bioleaching time, carbon source, pH, temperature, pulp density, and inoculum density and these were examined. Environmental scanning electron microscopy and X-ray diffraction were used to examine any textural or mineralogical changes at the surface of the kaolin that may have occurred during the bioleaching. Iron impurities in the kaolin were reduced from 0.88% to 0.48% with an increase in the natural whiteness index from 60.8% to 81.5% after 7 days of bioleaching treatment. A granulometric analysis of dispersed kaolin demonstrated that the bioleaching resulted in a decrease in particle size. The results demonstrated that the bioleaching was very effective at improving the quality of the kaolin, where insoluble Fe(III), either adsorbed to the kaolin surfaces or admixed as amorphous forms, was leached out by micro-organisms as water-soluble Fe(II).

Keywords

BioleachingDissimilatoryFe(III)-reducing BacteriaIron ImpurityKaolin
Type
Article
Information
Clays and Clay Minerals , Volume 58 , Issue 4 , August 2010 , pp. 515 - 521
Copyright
Copyright © The Clay Minerals Society 2010

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