Thermal and sintering behavior of bauxites from Haleo-Danielle, Minim-Martap (Cameroon)


ISSN 1121-7588
A.B. Tchamba1,2, U.C. Melo1,2, E. Kamseu1,2, R. Yongue3, D. Njopwouo1
1Laboratory of the Physical-Chemical Properties of Mineral Materials, University of Yaounde I, Yaounde, Cameroon
2Laboratory of Materials, Local Materials Promotion Authority, MIPROMALO, Yaounde, Cameroon
3Dept. of Earth Science, University of Yaounde I, Yaounde, Cameroon

Abstract

Three bauxite samples (BX3, BX5 and BX8) of high alumina content from the region of Haleo-Danielle, Minim-Martap in Cameroon were characterized thermally at temperatures between 1000 °C and 1600 °C with the objective to study their suitability for dense refractory materials. The water absorption, porosity, linear shrinkage, flexural strength and bulk density were assessed. At 1600 °C, BX3 and BX5 presented high densification (bulk density of 3.4 g/cm3) with low porosity (7%) with a bi-axial bending strength of 75 and 41MPa respectively. On the contrary at the same temperature, BX8 presented 31.5% porosity, bulk density of 2.54 g/cm3 and bi-axial bending strength of 55MPa. The low content in iron and titanium oxides give BX8 a clear grey color at 1600 °C. BX3 and BX5 presented an average linear shrinkage of about 27% while that of BX8 was only 13% at 1600 °C.
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