Patent ID: 6602547
Filing Date: 2003-08-05
Classification: B01J,B82Y,C09K,C23C

Abstract:
A method of making a particle with a reacted coating comprising the steps of:a) providing main chamber operating at a first temperature T1, b) locating in the main chamber a multiplicity of free particles having a core composition; c) providing a riser chamber operating with a wall temperature T3 greater than T1, d) providing a flow into the riser chamber of a precursor coating material having a cooling reaction temperature T4 less than T3 but not less than T1, the precursor material flow being made at a flow temperature T2 greater than T4; e) providing a flow of the particles from the main chamber at a temperature less than the cooling reaction temperature T4, into the riser chamber to intimately mix with the flow of the precursor material, wherein relative to the precursor material temperature and density, the incoming particles have a sufficient thermal mass, and a low enough temperature, and the particles pass through the riser chamber sufficiently quickly, that the particles emerge from the riser chamber with a condensation coating of the precursor material; f) guiding the combined flows of the particles and coating material to an exhaust flow; g) separating the coated particles from the exhaust flow and h) returning the coated particles to a main reactor chamber operating at a temperature less than the cooling reaction temperature T4.