Apparatus for coating powder particles

An apparatus for coating powder particles, comprising:

• drying means including a space for drying powder particles on the surfaces of which a coating liquid is deposited while floating said powder particles by an air flow;
• powder-particle feeding means connected to a top portion of said drying means for feeding an air flow containing dispersed powder particles into said space through a cylindrical path;
• and
• supply means comprising multiple annular members stacked in layers to define a plurality of discharge ports in an inner wall of said cylindrical path of said powder-particle feeding means, wherein at least one of said discharge ports opens perpendicularly to said inner wall, each of said plurality of discharge ports being arranged to selectively supply air only, coating liquid only, or coating liquid and air, and when arranged to supply the coating liquid or the coating liquid and air, the inner wall being wetted by the coating liquid, whereby the powder particles contained in the air flow are brought into contact with the inner wall and are coated with the coating liquid.