Classification device and dust compaction system

A dust compaction system, comprising a classification device and a compaction device, wherein the classification device comprises:

• a hose configured to suck dust containing fine dust and foreign matter from a tip thereof;
• a body defining a classification space therein, connected to an end of the hose so that the hose communicates with the classification space, including an upper discharge port and a lower discharge port, the upper discharge port being provided in an upper portion of the body so as to be connected to a suction device that creates a negative pressure in the classification space, and the lower discharge port being provided in a lower portion of the body so as to discharge the foreign matter that has fallen into the classification space;
• a lid member configured to be mounted on a container defining a storage space for storing the foreign matter discharged from the lower discharge port of the body, including an air intake configured to communicate with the storage space, and positioned below the body;
• and
• an air introduction pipe connected to the air intake of the lid member and configured to be disposed in the storage space, and wherein the compaction device is configured to receive the fine dust having passed through the upper discharge port of the body and compresses the fine dust to form a pellet.