PREPARATION OF POROUS CERAMIC PELLETS BY MULTIPHASE DOUBLE EMULSION METHOD

摘要

This paper focused on the preparation of porous ceramic pellets for microorganism carriers. A new method for the process was developed using simple gel-casting and bubble-in-water-in-oil type of multiphase double emulsion. The globules, consisting of a foamed sepiolite slurry suspension, were dispersed and consolidated in spherical shape in liquid paraffin as gelation progressed. The green pellets were sintered at 1100°C.The influence of surfactants, extension ratio and impeller revolution rate on the process and characteristics of the pellets was investigated. The pellet size was in the range of 1～4mm and determined directly by impeller revolution rate. The fine cell diameter of porous ceramic was in the range of 100～500μm and the micropore diameter was less than 5μm. The inner macropores were interconnected and extend to the external surface. It is impossible to analyze a result by SEM micrographs and digital camera.