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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,αFeOOH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
The process of dehydration of αFeOOH particles and hydrolysis of tetraethoxysilane (TEOS) to form SiO2 coating in a fluidized bed reactor was studied. The results show that, α FeOOH dehydration to promote the particle surface hydrolysis reaction is conducive to the formation of uniform SiO2 envelope. The effect of reaction temperature, reaction time, TEOS concentration and ammonia concentration on the coating amount of SiO2 was further studied. Using this technology, the dehydration, coating and reduction processes are realized in one step, and the good performance SiO2-coated Fe3O4 magnetic powder