Patent ID: 7971808

Claim:
A vertical grinding mill comprising a vertical, closed milling container ( 1 ); a screw conveyor ( 2 ) which is arranged centrally in the milling container ( 1 ), the screw conveyor ( 2 ) comprising a drive shaft ( 4 ) with a central axis ( 3 ) and at least one screw flight ( 5 ) which is arranged on the drive shaft ( 4 ), extends along a height (hs) up to an upper end ( 6 ) and covers the cross-section of the milling container ( 1 ) only partially; a package of grinding bodies ( 17 ), the package having an upper surface ( 39 ); a grinding stock inlet ( 19 ) which projects into the milling container ( 1 ) above the package of grinding bodies ( 17 ); a gas inlet ( 24 , 24 ′, 24 ″) which projects into the milling container ( 1 ) for introducing gas; a grinding stock outlet ( 11 ) which projects out of the milling container ( 1 ) and has a lower edge ( 18 ) and a height (h 13 ) for discharging grinding stock ( 22 ) and gas; and a motor ( 7 ) for driving the screw conveyor ( 2 ) in a direction of rotation ( 8 ) where the at least one screw flight ( 5 ) conveys grinding bodies ( 17 ) upwards, wherein the grinding stock outlet ( 11 ) comprises an outlet opening ( 13 ) with a screen ( 14 ); the upper end ( 6 ) of the at least one screw flight ( 5 ) is arranged on a level with the screen ( 14 ); and the gas inlet ( 24 , 24 ′, 24 ″) is arranged above the upper end ( 6 ) of the at least one screw flight ( 5 ).