Patent ID: 6475462
Filing Date: 2002-11-05
Classification: B01J,C04B,C22B,F27B,Y10S

Abstract:
A process for treating a particulate material, in which particles of the material to be treated contact a host bed of particles, the process comprising the steps of:(i) providing a processing chamber having an inlet and an outlet spaced downstream therefrom, the base of said chamber comprising a plurality of outwardly radiating inclined vanes, (ii) providing the host bed of particles in the chamber and generating a flow of fluid through the vanes at the base of the processing chamber such that the bed of host particles circulates about an axis of the chamber in a compact band, (iii) injecting particles of the material to be treated through an inlet of the chamber to contact with the circulating bed of the host particles, wherein the particles of the material to be treated are carried into the chamber with said flow of fluid, wherein the relative terminal velocity of the particles to be treated and the host particles is such that there is substantially no migration of the host particles to the outlet, and wherein substantially all of the particles of the material to be treated migrate downstream through the circulating host particles to the outlet; and wherein the particles of the material to be treated spend on average from 1 to 1000 ms in the circulating host bed particles.