Journal
HIGH-PERFORMANCE CERAMICS VII, PTS 1 AND 2
Volume 512-515, Issue -, Pages 49-53Publisher
TRANS TECH PUBLICATIONS LTD
DOI: 10.4028/www.scientific.net/KEM.512-515.49
Keywords
Coal gangue; Mullite nanocomposites; Hydrothermal crystallization
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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 degrees C for 3 h with NaOH concentration of 2-4 mol/L and US ratio (liquid/solid ratio in mass) of 10 mL/g by using calcined coal gangue as precursor. The agglomerate powder size of D-50 is about 3.83-4.71 mu m. 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 [AlSi]O-4 tetrahedral and the growth unit Al[OH](4)(-) exists in this process definitely.
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