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Influence of metakaolin from Mayouom, Cameroon, on the properties of high grade calcined bauxite sintered at 1500°C

Influence of metakaolin from Mayouom, Cameroon, on the properties of high grade calcined bauxite... Processing of high calcined grade bauxite and metakaolin-based ceramic by unidirectional humid pressing using five formulation approaches have been studied. They include bauxite with high content of alumina Al2O3 > 86 wt% and metakaolin with silica content SiO2 > 56 wt%; the ceramic products obtained at 1500 °C present 65.9 to 26.8 MPa biaxial bending four points strength, respectively, for 0 wt% and 20 wt% of substitution of bauxite by metakaolin. The increase of metakaolin in bauxite favored the formation of cumulative pore volume from 63 to 145 ml/g for 0 wt% and 20 wt%, respectively. The decrease of linear shrinkage has been observed for 21.9 to 13.3%, respectively, for 0 wt% and 20 wt% of metakaolin. The SEM and EDS investigations show round grains of corundum and 3:2 mullite particles of about 10 μm; with 20 wt% of metakaolin in bauxite, grain of corundum and 3:2 mullite are corroded by the impurities like Ti, Fe, and K. The ceramic product obtained for 0 wt% has properties for high rigidity materials for structural application and the substituted one up to 20 wt% by metakaolin is favored for microfiltration. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of the Australian Ceramic Society Springer Journals

Influence of metakaolin from Mayouom, Cameroon, on the properties of high grade calcined bauxite sintered at 1500°C

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Publisher
Springer Journals
Copyright
Copyright © Australian Ceramic Society 2020
ISSN
2510-1560
eISSN
2510-1579
DOI
10.1007/s41779-020-00484-y
Publisher site
See Article on Publisher Site

Abstract

Processing of high calcined grade bauxite and metakaolin-based ceramic by unidirectional humid pressing using five formulation approaches have been studied. They include bauxite with high content of alumina Al2O3 > 86 wt% and metakaolin with silica content SiO2 > 56 wt%; the ceramic products obtained at 1500 °C present 65.9 to 26.8 MPa biaxial bending four points strength, respectively, for 0 wt% and 20 wt% of substitution of bauxite by metakaolin. The increase of metakaolin in bauxite favored the formation of cumulative pore volume from 63 to 145 ml/g for 0 wt% and 20 wt%, respectively. The decrease of linear shrinkage has been observed for 21.9 to 13.3%, respectively, for 0 wt% and 20 wt% of metakaolin. The SEM and EDS investigations show round grains of corundum and 3:2 mullite particles of about 10 μm; with 20 wt% of metakaolin in bauxite, grain of corundum and 3:2 mullite are corroded by the impurities like Ti, Fe, and K. The ceramic product obtained for 0 wt% has properties for high rigidity materials for structural application and the substituted one up to 20 wt% by metakaolin is favored for microfiltration.

Journal

Journal of the Australian Ceramic SocietySpringer Journals

Published: May 28, 2020

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