Preparation and Microstructure of Bauxite Ceramic Microsphere
In this paper, microspheres were prepared by using Chinese bauxite as raw materials through centrifugal spray drying method. The microstructure and composition of ceramic microsphere were investigated by X-ray diffraction, scanning electron microscope and X-ray energy spectrum. The particle size was 10~100#m. The XRD analysis reveals that the main crystalline phase of the ceramic microsphere were α-Al2O3 and mullite (3Al2O3•2SiO2). The Al2O3 content (chemical composition) of the microspheres was little more than 70%, and the molar ratio of Al2O3/SiO2 was near to the molar ratio of alumina and silica of mullite.
Wei Pan and Jianghong Gong
X. S. Cheng, L. K. Zeng, X. Y. Li, W. Y. Sheng, A. Z. Shui, Z. H. Liu, Y. Y. Zhang, Y. Wang, Y. Z. Wang, "Preparation and Microstructure of Bauxite Ceramic Microsphere", Key Engineering Materials, Vols. 336-338, pp. 1124-1126, 2007