Ceramic membrane separation technique for washing nano-sized ceramic powder precursors

Washing using ceramic micro-filtration membranes was studied in the preparation of nano-sized TiO2 and Al2O3 powder precursors obtained by wet chemical methods. The key parameters for the washing process, such as operation pressure, cross-flow velocity, and slurry concentration, were examined and optimized. The shape and size of particles influenced the structure of the filter cake, leading to different permeation flux for different systems. The results demonstrated that washing using ceramic membranes is superior to the traditional plate-and-frame filtration and could be considered an advanced technique for ultra-fine powder preparation by wet-chemical method.

Washing process incorporating a ceramic micro-filtration membrane for preparation of nano-sized TiO2 and Al2O3 powder precursors was found to comprise two washing stages, explaining why the remaining ions in nano-sized powder slurry could be cleaned up to as low as 10 ppm by the ceramic membrane separation technique.Figure optionsDownload as PowerPoint slide