An Investigation on the Effect of Cement Kiln Dust and Glauconite on the Properties of Acid Resisting Brick

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Author(s) Medhat S. El-Mahllawy
Pages 30-43
Volume 2
Issue 1
Date January, 2013
Keywords Cement kiln dust, glauconite, acid resisting brick, sintering temperature.
Abstract

Cement industry and excavation in iron ore mines in Egypt produced large amounts of cement kiln dust (CKD) and green glauconite in the form of powder and rock fragments, respectively, and have to be discarded. The present work aims to study the effect of cement kiln dust (industrial waste) and glauconite (unexploited quarry material) addition on the properties of acid resisting brick (ARB). This could be cost effective by utilization of these materials in a useful application and it can helpful in tempering the environmental problems associated with such wastes. Three mixtures were designated for studying including variable percentages of clays, CKD, glauconite and Na2CO3. Clay based mixtures containing up to 25wt.% glauconite and up to 15wt.% CKD were uniaxially pressed in 5cm side length cube at 22MPa and sintered in an electric furnace (1100-1150oC, for 2h). Results of the physical, chemical and mechanical properties of the made briquettes were assesses according to the Egyptian Standard Specification (ESS) 41-2005. Also, the development of phases and microstructures of selected fired briquettes were characterized using X-ray diffraction (XRD) and scanning electron microscopy (SEM) as well as energy dispersive X-ray (EDX) analysis. The experimental results revealed that the technological properties were found to be strongly influenced by the addition of CKD, glauconite and firing temperature. Also, it was found that decreasing the content of the CKD and increasing of glauconite provided capable vitrified ARB at reasonable sintering temperature. It was confirmed by the recommended briquettes of the mixture M1 (35% kaolin, 35% clay, 5% CKD and 25% glauconite) fired at 1150oC which meets the acid resisting properties according to the ESS at accelerated sintering process, resulting great contributions to economy and ecology of Egypt.

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