The present invention, subjected to the provision of a uniform space, pulverizing force, the operation of the medium (media) is good, improvement of the grinding capacity of the medium and improved separation performance and more as a challenge to provide a circulation-type medium stirring mill in the improvement of the efficiency in high-speed rotation, in that solution, the circular medium of the present invention stirred Mill, in the tubular container (vessel), has a cylindrical wall on the outer circumferential portion, one end being closed by an additional hub portion, and the other end opening of the cylindrical hollow ( ), rotatably disposed inside the vessel a stirring member, Jean grinding medium into the grinding chamber formed between the inner peripheral wall of the cylindrical wall of the container and the stirring member, the interior space of the stirring member, the stirring member and the separating member arranged in the coaxial medium, the the grinding chamber, blood inlet for introducing the pulverized product as a raw material containing a raw material, is treated in the grinding chamber, is introduced into the medium in the separation chamber is formed between the stirring member and the medium separating member, pulverized by the medium separating member a material outlet for introducing the raw material is separated into the external medium, and includes a communicating ( ) to the circulation path to the material inlet and a material outlet, the area of the length of the container chamber within the vessel L1, the diameter when in D, and the L1 / D is less than 1, the plurality of openings in the cylinder wall and the hub portion of the stirring member is formed, and is characterized in that the grinding chamber and a separation chamber that is in communication medium.
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