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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 13    No. 3    June 2003

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SEM observation of gibbsite precipitation with seeds from sodium aluminate
solutions promoted by ultrasound
CHEN Guo-hui(陈国辉), CHEN Qi-yuan(陈启元),
YIN Zhou-lan(尹周澜), ZHANG Ping-min(张平民)

College of Chemistry and Chemical Engeering,
Central South University, Changsha 410083, China

Abstract:The microstructure of gibbsite precipitated with seeds from sodium aluminate solution was studied using SEM. The results show that there are a lot of fine secondary nuclei with diameter less than 1μm and the surfaces of seeds precipitated by low frequency ultrasound are very irregular. The new nuclei are pseudohexagonal slices with nanometer grade in thickness. At higher precipitation temperature, such as 75℃, SEM micrographs show that there exist something like colloid on joints of different small granules which have agglomerated to a large particle. It is suggested that the formation of such hexagonal crystalline units is promoted by low frequency ultrasound, while the colloids on the surface may be produced by imcompletely crystallization of the growth units.

 

Key words:  ultrasound; sodium sluminate solution; SEM; secondary nuclei

ISSN 1672-7029
CN 43-1423/U

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