Patent ID: 7374116
Filing Date: 2008-05-20
Classification: B02C

Abstract:
1. A circulation type media agitator mill comprises: a cylindrical vessel; an agitating member arranged rotatably in the cylindrical vessel, the agitating member including a cylindrical wall and a hub closing one end of the cylindrical wall at periphery, the other end of the cylindrical wall being opened, grinding media contained in a grinding chamber defined between the cylindrical wall of the agitating member and a surrounding cylindrical wall of the vessel; a media-separating member arranged coaxial with the agitating member in the inner space of the agitating member; an inlet for leading material to be ground to the grinding chamber, said inlet opening radially into said cylindrical vessel and located axially displaced from said agitating member; an outlet for leading to the outside of the mill the material which is treated in the grinding chamber, introduced into a media separating chamber formed between the agitating member and the media separating member and separated from the grinding media by the media separating member, and a circulation passage outside the mill, extending from the inlet to the outlet of the mill, in which the vessel is designed that the quotient of the length L 1 divided by the diameter D of the vessel (L 1 /D) is in the 0.3 to 0.4 range, wherein the quotient of the length L 2 of the media separating chamber divided by the length L 1 of the vessel (L 2 /L 1 ) is in the 0.4 to 0.7 range, and wherein the quotient of the annular width d 1 of the grinding chamber divided by the annular width d 2 of the media separating chamber (d 2 /d 1 ) is in the 0.5 to 2 range, the cylindrical wall and hub of the agitating member have a plurality of openings to make the grinding chamber communicate with the media separating chamber.