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The study of aluminum loss and consequent phase transformation in heat-treated acid-leached kaolin.


Citation

Mohd Salleh, Mohamad Amran and Choo, Thye Foo and Mahmood, Che Seman (2011) The study of aluminum loss and consequent phase transformation in heat-treated acid-leached kaolin. Materials Characterization, 62 (4). pp. 373-377. ISSN 1044-5803

Abstract

This study investigates the effect of Al leaching during Fe removal from kaolin to mullite. Heat-treated kaolin was obtained by heating natural kaolin at 400, 500, 600, 700, 800 and 900 °C. The heat-treated kaolin was then leached at 100 °C with 4 M, 3 M, 2 M, 1 M, 0.2 M solution of H2SO4 and 0.2 M solution of oxalic acid. The dried samples were sintered to 1300 °C for 4 h at a heating rate of 10 °C min−1. X-ray diffractometry and differential thermal analysis were used to study the phase transformation of kaolin to mullite. It was found that 700 °C is the optimum preheat-treatment temperature to leach out Fe and also Al for both types of the acids used. The majority of the 4 M sulfuric acid-treated kaolins formed the cristobalite phase when sintered. On the other hand, 1 M, 0.2 M sulfuric acid and 0.2 M oxalic acid leached heat-treated kaolin formed mullite and quartz phase after sintering.


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Additional Metadata

Item Type: Article
Divisions: Faculty of Engineering
DOI Number: https://doi.org/10.1016/j.matchar.2011.01.017
Keywords: Clays; Mullite; Calcination; X-ray methods.
Depositing User: Muizzudin Kaspol
Date Deposited: 20 Oct 2015 07:13
Last Modified: 20 Oct 2015 07:13
Altmetrics: http://www.altmetric.com/details.php?domain=psasir.upm.edu.my&doi=10.1016/j.matchar.2011.01.017
URI: http://psasir.upm.edu.my/id/eprint/23200
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