The Process Study of SiO2 Coating onα-FeOOH Particles by Surface Hydrolysis Reaction in Fluidized BED Reactor

Abstract

Abstract: The process of SiO₂coating onα-FeOOH particles by dehydration and hydrolysis of te-traethylorthosilicate(TEOS)in fluidized bed reactor has been investigated.The results show that The dehydration of α-FeOOH promote The hydrolysis reaction on The particle surface, which is used to form uniform layer.The effects of The reaction temperature, reaction time, TEOS con-cent ration and The ammonia concent ration, respectively, on The contents of silica were also inves-tigated.Using this technique, The processes of dehydration, coating silica and reduction ofα-FeOOH were carried out by one step, and The SiO₂coated by Fe₃O₄particles with good magnetic properties were obtained.

Key words: Fluidized bed reactor, Hydrolysis, Coating, Silica, Iron oxides, Magnetic particle

CLC Number:

O647.1

TrendMD:

ZHU Yi-Hua, LI Chun-Zhong, WU Qiu-Fang, XU Qiang . The Process Study of SiO₂ Coating onα-FeOOH Particles by Surface Hydrolysis Reaction in Fluidized BED Reactor[J]. Chem. J. Chinese Universities, 1999, 20(1): 119.

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The Process Study of SiO₂ Coating onα-FeOOH Particles by Surface Hydrolysis Reaction in Fluidized BED Reactor

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