蒸気を援用した新規微粒子分離・分級技術の開発

Abstract

The purpose of the present study was development of novel technique for separation, classification and surface modification of particles dispersed in the dry system using dry-cyclone with mist. It was clear that classification performance was improved using a cyclone with water mist supplied from a upper part of dust box and a cut size was able to be controlled changing the flow rate of the entrainment gas. The ratio of the mass of the powders collected by the upper part of the cyclone to the mass of the total feeding powder was enhanced because of the attractive force, which was attributed to the static electricity that appeared between the silica particle and the wall of the cyclone under the condition of the existence of water mist. However, this type of attractive force was expected to be weaker between silica particles with a small contact area within the cyclone thereby maintaining the dispersion stability of the particles. Hence, the classification performance of the cyclone was enhanced during the supply of the water mist. As similarly, this method using mist was applicable to the classification of particles by Louver type classifier. Mist generated from dry ice and hot water was supplied to the separator from the bottom of the classifier to make the cut size smaller. About surface modification of particles using dry-cyclone and mist of silane coupling agent solution, it was effective that the entire of the surface of the particles was modified in the smaller time dry-system from the measurement of the contact angle and the surface tension.