高等学校化学学报

高等学校化学学报 ›› 1999, Vol. 20 ›› Issue (1): 119.

• 论文 • 上一篇    下一篇

流化床反应器中α-FeOOH粒子表面水解包覆SiO2过程研究

朱以华, 李春忠, 吴秋芳, 许强   

  1. 华东理工大学技术化学物理研究所, 上海 200237
  • 收稿日期:1998-02-17 出版日期:1999-01-24 发布日期:1999-01-24
  • 通讯作者: 朱以华,男,37岁,副教授.
  • 基金资助:

    国家自然科学基金

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

ZHU Yi-Hua, LI Chun-Zhong, WU Qiu-Fang, XU Qiang   

  1. Institute of Technical Chemistry and Physics, East China University of Science and Technology, Shanghai, 200237
  • Received:1998-02-17 Online:1999-01-24 Published:1999-01-24

PDF (PC)

摘要： 研究了流化床反应器中αFeOOH粒子表面脱水与正硅酸乙酯(TEOS)水解反应形成SiO2包覆层的过程.结果表明,α-FeOOH脱水促进了粒子表面水解反应,有利于形成均匀的SiO2包膜.同时还进一步研究了反应温度、反应时间、TEOS浓度和氨浓度对SiO2包覆量的影响.采用这一技术,一步实现了脱水、包覆和还原过程,得到了性能良好的SiO2包覆Fe3O4磁性粉末.

关键词: 流化床, 水解, 包覆, 氧化硅, 氧化铁, 磁性粒子

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

中图分类号: 

TrendMD: