Apparatus for drying powdered or granular materials

An apparatus for drying powdered or granular materials comprising:

• a drying tank (1) including a transversely extending drying room (7) adapted to be applied with heating by microwaves and having a material inlet (8) at one end and a material outlet (9) at the other end;
• at least one partition made of a material that not allow microwaves to pass therethrough and defining more than two drying zones (a . . . d) in the drying room (7) of the drying tank (1);
• a rotary shaft (12) disposed in the drying tank (1) in its longitudinal direction to extend through the drying room (7) in a manner of being freely rotatable and agitating blades (30a), (30b) . . . provided on the rotary shaft (12) corresponding to each drying zone (a . . . d);
• microwave application units (40) provided for each drying zone (a . . . d);
• and temperature sensors (50) for each drying zone (a . . . d);
• and corresponding temperature adjusters (51) connected to the respective temperature sensors (50).