Manufacture of Fine AL2O3 Granules as Catalyst Carrier by anExtrusion/Spheronization Method

摘要

The effect of formulation (filler's kind and amount,liquid's kind and concentrationrequired for granulation) and spheronization time on characterization of alumina based pelletsparameters (pellets size distribution,roundness and aspect ratio) were investigated.Two schemeswere successfully proofed by extrusion/spheronization.The mean volume particle diameter wasfound to have a profound effect on the formulation and processing parameters.Alumina powder withlarge mean volume particle diameter showed different mechanism of action with coupling agent.With the surface modification,the water required for granulation had decreased.The existing formaland kinematic velocity of the water had a direct effect on the processing parameter of the extrusionand spheronization.Spheronization time from 2 to 10 min had a pronounced effect on roundness andaspect ratio.No changes in roundness and aspect ratio were observed from 10 to 20 min ofspheronization time.