A fluidized-bed granulation coating method

A fluidized-bedgranulationcoating method comprising the steps of: partitioning upward to downward, into sections, a powder grain processing step of handling powder grains in a fluidized-bed state; pneumatic classifying, against a fluidized-bed forming gas, the powder grains having been handled in one immediately upper section of the sections adjacent to one another to move to one lower section thereof; and thereby performing granulation and/or coating and drying of said powder grains while said powder grains pass upward to downward.

Afluidized bed granulation coating method that is another present invention is characterized by: partitioning upward to downward, into sections, a powder grain processing step of handling powder grains in a fluidized- bed state; pneumatic classifying, against a fluidized- bed forming-gas, the powder grains having been handled in one immediately upper section of the sections adjacent to one another to move to one lower section thereof; and thereby performing granulation and/or coating and drying of said powder grains while said powder grains pass upward to downward.

Such fluidized- bedgranulation coating method is characterized in that granulation and/or coating are performed in the uppermost section of the plurality of sections of said fluidized- bed granulation coating device. The powder grains subjected to a granulating process and/or a coating process may be dried, for example, in one section or more other than said uppermost section. The coating may be performed, for example, in any one of the sections other than said uppermost section. A process extending from the granulation and/or coating of said powder grains to a product discharge may be continuously performed, for example. Or, the process extending from the granulation and/or coating of said powder grains to the product discharge may be intermittently performed while a downward movement of said powder grains may be interrupted, for example, until the completion of an upper process. An auxiliary gas other than said fluidized- bed forming-gas is supplied, for example, into one section or more of said plurality of sections.

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A fluidized-bed granulation coating method