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Removal of Fe From Kaolin by Chemical Leaching and Bioleaching

Published online by Cambridge University Press:  01 January 2024

Volkan Arslan  and
Oktay Bayat
Volkan Arslan*
Affiliation:
General Directorate of Minerals Research and Exploration, Adana 01360, Turkey
Oktay Bayat
Affiliation:
Mining Engineering Department, Cukurova University, Adana 01330, Turkey
*
* E-mail address of corresponding author: varslan@cu.edu.tr
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Abstract

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The use of microorganisms to remove Fe (oxyhydr)oxides from kaolins has the potential to be an effective method for upgrading the whiteness and brightness, and therefore the commercial value, of the kaolin. The purpose of the present study was to compare kaolin products obtained by currently used chemical leaching methods with a bioleaching treatment using Aspergillus niger in order to remove Fe from kaolin (from Canakkale, Turkey). The effects of pulp density, temperature, and oxalic acid concentration on the chemical leaching experiments were investigated using the ANOVA-Yates test. The greatest degree of removal of Fe from the kaolin sample (at 15% w/v pulp density, temperature of 80°C, oxalic acid concentration of 0.2 M, and a particle size of <63 µm) was found to be 94.89% in 120 min of leaching. The Fe content decreased from 1.723%) Fe2O3 to 0.088% Fe2O3. In a shake flask, bioleaching of kaolin by Aspergillus niger resulted in removal of 77.13% of the total Fe, suggesting that this strain is effective at removing Fe impurities from kaolin. The removal efficiency generally decreased with increased pulp density. The Fe content of the kaolin decreased from 1.723% Fe2O3 to 0.394% Fe2O3 (at 1% w/v pulp density, temperature of 25°C, Aspergillus niger 3 × 107 spores, and particle size of <63 µm) after 21 days of bioleaching.

Keywords

Aspergillus nigerBioleachingChemical LeachingKaolinYates’ Technique
Type
Research Article
Information
Clays and Clay Minerals , Volume 57 , Issue 6 , December 2009 , pp. 787 - 794
Copyright
Copyright © The Clay Minerals Society 2009

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