Flash dryer is a new type of continuous drying equipment integrating drying, crushing and screening. It is especially suitable for drying filter cake, paste and slurry materials. The drying time of wet materials in the drying tower is only 5-8 seconds, and the water evaporates instantly. The quality of dried products is closely related to the drying temperature, wind speed, air volume and crushing speed. The hot air enters the annular gap at the bottom of the drying chamber in the tangential direction from the inlet pipe and rises spirally. At the same time, the materials are quantitatively added into the tower by the feeder and fully heat exchanged with the hot air. The larger and wetter materials are mechanically crushed under the action of the agitator. The materials with low moisture content and small particle size rise together with the rotating air flow and are transported to the separator for gas-solid separation, The finished products are collected and packaged, and the tail gas is discharged after being treated by the dust removal device.