PROCESS AND APPARATUS FOR PRODUCING FINE PARTICLES

摘要

The present invention is directed to a process and apparatus wherein primary fine particles are introduced into a cyclone to be subjected to cooling and classification removing coarse particles having a particle size equal to or greater than the predetermined particle size by the classification, based on a predetermined particle size and secondary fine particles having a particle size of 100 nm or less which are left upon removal of coarse particles are recovered. The treatment for forming the primary fine particles is a treatment in which a material for producing the fine particles is dispersed and then introduced into a thermal plasma flame to evaporate the material for producing the fine particles to make a vapor-phase mixture. In the fine particle producing process and apparatus, a gas of an amount sufficient to quench the vapor-phase mixture is supplied toward a tail of the thermal plasma flame.