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桨型对超细铁黄制备的影响

樊红雷; 宋宝珍; 仰振球; 刘菊花; 张健   

  1. 中国科学院过程工程研究所 北京 100080
  • 收稿日期:2002-02-04 修回日期:2002-04-15 出版日期:2003-03-20 网络出版日期:2003-03-20

Effects of Paddle s Types on the Preparation of Ultrafine goethite Particles

FAN Hong-Lei; SONG Bao-Zhen; YANG Zhen-Qiu; LIU Ju-Hua; ZHANG Jian   

  1. Institute of Process Engineering; Chinese Academy of Sciences; Beijing 100080; China
  • Received:2002-02-04 Revised:2002-04-15 Published:2003-03-20 Online:2003-03-20

摘要: 选取代表径向流、轴向流以及轴径向流的典型搅拌叶轮,考察了不同类型搅拌叶轮对铁黄制备过程的影响.实验结果表明,一定通气量及转速条件下,代表轴径向流的PBT(45°斜叶桨)叶轮具有良好的分散性能和整体混合性能,使得整个体系的表观反应速率增大.并且随着反应时间的增长,反应体系的粘度先上升,然后趋于某一稳定的值,最后又呈现上升的趋势.同时,使用斜叶桨制得的铁黄粒子的粒径分布范围较窄,粒子的形貌较齐整,枝晶较少.

关键词: 铁黄, 桨型, 制备

Abstract: Typical stirring paddles inducing radical flow and axial flow as well as axial and radical flow were selected
in order to investigate their effects on the process of goethite preparation. Experimental results show that PBT (pitched blade turbine) inducing axial and
radical flow reveals good dispersibility and complete mixing properties, and makes apparent reaction rate of the system larger. Moreover, with the increase
of reaction time, the viscosity value of reaction system becomes large at first, and then amounts to a plateau, increases again at last. At the same time,
ultrafine goethite particles prepared by PBT are with narrow particles’ size distribution, uniform morphology and few dendrities.

Key words: goethite, stirring paddles, preparation

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