Patent ID: 8540174

Claim:
A method for producing powder comprising: supplying a powder material from a powder material supply inlet to a fluidized bed container; jetting fluid from each of a plurality of fluid jetting nozzles provided in the fluidized bed container so as to collide against each other, thereby fluidizing and pulverizing the powder material in the fluidized bed container to form powder; classifying the powder using a centrifugal classification rotor provided at the upper part of the fluidized bed container; and discharging the classified powder from an outlet by being guided by the centrifugal classification rotor; wherein the centrifugal classification rotor is rotated at a first rotating speed for a predetermined time from the beginning of the flow of the powder material in the fluidized bed container, and at a second rotating speed after the predetermined time has passed, and the centrifugal classification rotor is controlled so that the first rotating speed is higher than the second rotating speed.