Preparation of Mullite Nanocomposites Powders by The Hydrothermal Crystallization Method from Coal Gangue
Mullite nanocomposites powders have been successfully synthesized from pretreated coal gangue via hydrothermal crystallization process.The mullite nanocomposites powders are investigated and charactered by laser particle size analysis,X-ray diffraction analysis,transmission electron microscopy analysis,selected area electron diffraction analysis and energy-dispersive X-ray analysis.Moreover,the reaction mechanism of this process is speculated according to MAS-NMR results.It is indicated that mullite nanocomposites powders can be prepared at 80-90 ℃ for 3 h with NaOH concentration of 2-4 mol/L and L/S ratio (liquid/solid ratio in mass) of 10 mL/g by using calcined coal gangue as precursor.The agglomerate powder size of D50 is about 3.83-4.71 μm.Furthermore,some imperfective puncheon-shaped crystals exist among a large number of whole puncheon-shaped crystals which are about 30-70 nm in length and about 10-20 nm in diameter.MAS-NMR analysis indicates that the nano-size mullite grows around the central atom-Al,Si of AlSiO4 tetrahedral and the growth unit AlOH4-exists in this process definitely.
Coal gangue Mullite nanocomposites Hydrothermal crystallization
Ling-xin Tong Jin-hong Li Fang Liu
National Laboratory of Mineral Materials,China University of Geosciences,100083,China
国际会议
The Seventh China International Conference on High-Performance Ceramics (第七届先进陶瓷国际研讨会(CICC-7))
厦门
英文
49-53
2011-11-04（万方平台首次上网日期，不代表论文的发表时间）