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The disc dryer is a multi-layer fixed hollow heating circular loading plate, rotary rake stirring, vertical continuous drying equipment mainly focused on heat conduction, developed on the basis of intermittent stirring conduction dryer and a series of advanced technologies through continuous improvement. This drying process is to pass the heat carrier into each layer of hollow discs, indirectly heating the wet materials placed on the disc surface through thermal conduction. Under the scraping action of the rotating rake blades, the moisture in the constantly moving and rolling materials evaporates at the operating temperature, and its steam is discharged with the equipment exhaust gas, thereby continuously obtaining qualified dried products at the bottom of the equipment.