A New Recycling Process for Barium Titanate Based Waste

A recycling process was investigated for barium titanate based waste material, which is produced in the industrial production of ceramic capacitors and related devices. Barium titanate powder was first dissolved in a concentrated acid solution, followed by filtration to remove precipitated barium sulfate. Then the solution was diluted with water and heated to 100 o C, which resulted in the precipitation of a white titania powder. The crystalline phase of the prepared titania can be controlled by the heating rate. The apparent particle size of the titania was around 0.5 µm by the SEM observation, while the crystallite size is estimated to be less than 15 nm by XRD. This titania powder shows good photocatalytic activity as same as the commercial one.