A method and a device for producing and/or conditioning powdered material. The inventive method is characterized in that the material is treated in several stages in a spouted bed comprising inert particles, wherein the powdered material that is preprocessed in a first spouted bed of a first jet chamber (6) and is separated from the larger material particles in an integrated dust collector is fed to a superimposed second spouted bed of a second jet chamber (8) as a material-gas flow along with the gas flow discharged from the first spouted bed in order to be further reduced in size and be conditioned. After separating the fine particles from the larger material particles in a dust collector that is integrated into the second stage, the fine particles are discharged from the two-stage spouted bed treatment along with the gas flow as a powdered material having very small particle diameters. The separated larger material particles are once again fed to the second spouted bed of the second jet chamber.; The device includes a spouted bed apparatus in which a jet chamber encompassing an integrated dust collector as well as a second superimposed jet chamber encompassing another integrated dust collector are disposed.