SURFACE MODIFICATION OF PARTICLES

摘要

PURPOSE:To efficiently separate a mother substance and a daughter substance by a method wherein particles to be treated are received in the chamber surrounded by the surface of a rotary tray and the inner wall surface of a fixed ring and the daughter substance is released while the particles to be treated are centrifugally fluidized and gas is subsequently introduced into said chamber. CONSTITUTION:A freely rotatable circular rotary tray 2 wherein the longitudinal cross-section of the tray surface 2A thereof has a shape curved in a recessed state and a stationary fixed ring 1 formed so that the longitudinal cross-section of the inner wall surface 1A thereof has a shape curved in a recessed state and provided in coaxial relation to the rotary tray are provided. The tray surface 2A of the rotary tray 2 and the inner wall surface 1A of the fixed ring 1 are formed into a continuous smooth surface excepting the fine gap 29 between the rotary tray and the fixed ring. Particles to be treated or particles to be treated and a modifying medium are received in the modifying chamber 23 surrounded by the tray surface 2A and the inner wall surface 1A of this apparatus and the rotary tray 2 is rotated in this state to release a daughter substance from the particles to be treated and air is introduced into the modifying chamber 23 from the gap 29 and the released daughter substance is fed by an air stream to be discharged out of the chamber 23.