文献类型：期刊文献

英文题名：The process study of SiO₂ coating on α-FeOOH particles by surface hydrolysis reaction in fluidized BED reactor

作者：Zhu, YH; Li, CZ; Wu, QF; Xu, Q

机构：[1]E China Univ Sci & Technol, Inst Tech Chem & Phys, Shanghai 200237, Peoples R China

年份：1999

卷号：20

期号：1

起止页码：119

外文期刊名：CHEMICAL JOURNAL OF CHINESE UNIVERSITIES-CHINESE

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000079043900029)】；

语种：英文

外文关键词：fluidized bed reactor; hydrolysis; coating; silica; iron oxides; magnetic particle

摘要：The process of SiO2 coating on alpha-FeOOH particles by dehydration and hydrolysis of tetraethylorthosilicate (TEOS) in fluidized bed reactor has been investigated, The results show that the dehydration of alpha-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 concentration and the ammonia concentration, respectively, on the contents of silica were also investigated. Using this technique, the processes of dehydration, coating silica and reduction of alpha-FeOOH were carried out by one step, and the SiO2 coated by Fe3O4 particles with good magnetic properties were obtained.