Patent ID: 7823810

Claim:
A method for at least one of production or conditioning of powdered material in a spouted bed with inert bed particles in which a targeted particle size is achieved by way of abrasion of material particles and the inert bed particles moving along each other in the spouted bed and a final product is deposited at a separator, the method comprising: in a two or multiple stage conditioning of the material, pretreating the powdered material in a first spouted bed ( 4 ) and feeding material separated from coarser material particles in an integrated dust separating device ( 7 ) together with a gas flow leaving the first spouted bed ( 4 ) as a material gas flow ( 15 ) to a second spouted bed ( 4 ) located thereabove, further milling and conditioning the material in the second spouted bed and, after separating the powdered material from the coarser material particles in an integrated dust separating device ( 9 ), discharging a powdered material having very small particle diameters from the two-stage spouted bed conditioning with the gas flow, and returning coarser material particles to the spouted bed ( 4 ) of the second jet chamber ( 8 ).