Effects of Paddle s Types on the Preparation of Ultrafine goethite Particles
桨型对超细铁黄制备的影响

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.