Classification system using fluidized bed

A classification system using a fluidized bed, the classification system comprising:

• a fluidized bed classifier configured to be supplied with a powder containing particles of different sizes, the fluidized bed classifier being configured to entrain the powder into a fluidized gas, and the fluidized bed classifier being configured to discharge a coarse powder of the powder through a coarse powder outlet positioned in a lower portion of the fluidized bed classifier;
• a cyclone communicating with an upper portion of the fluidized bed classifier, the cyclone being configured to collect a fine powder of the powder entrained in the fluidized gas transferred from the fluidized bed classifier, and the cyclone being configured to discharge the collected fine powder from a fine powder outlet positioned in a lower portion of the cyclone;
• and
• an internal structure positioned in a fluidized bed region of the fluidized bed classifier, the internal structure being configured to reduce a size of a bubble of the fluidized gas,
• wherein the internal structure includes a frame conforming to an inner circumferential surface of the fluidized bed classifier and includes a wire having a lattice structure located in the frame,
• wherein a diameter of the wire is 0.1% to 2% of a diameter of the fluidized bed classifier, and
• wherein an open area of the internal structure is 80% to 95% of a cross-sectional area of the fluidized bed classifier.