Centrifugally rolling granulating device and method of treating powder and granular material using the device

Abstract

A centrifugal tumbling granulating apparatus 1 comprises a fixed wall 7 having a grain contact portion 7a which is in contact with powder grains 2 and of which a horizontal section is formed in a circular shape, and a rotating disk 5 provided a clearance 12 away from an inner side of the fixed wall 7 and rotating in a horizontal direction by a motor 13, wherein an air supply device 21 for supplying drying air 22 to an upper surface side of the rotating disk 5 is provided above the rotating disk 5. The air supply device 21 has a cylindrical straight tube portion 25, and an air supply port 23 formed in a cone shape, and is disposed in a centrifugal tumbling chamber 6 to be movable in an up-and-down direction. During a granulating step, the air supply device 21 stops to supply the dry air 22 and waits at an upper position H. After the granulation processing, the air supply device is lowered at a lower position L and supplies the dry air 22 onto the rotating disk 5 to dry granulated substances. As a result, the granulating apparatus capable of efficiently obtaining, in a single apparatus, spherical particles of which each particle size is small and which exist within a narrow range of particle size distribution and of which deviation from spherical form is small is provided.

Dependencies are inferred from the claim text.