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