Abstract: A comminution apparatus can include a seal that is configured to interface with a lip seal defined adjacent to sidewall of a housing adjacent to a lever connected to a roller located inside the housing. The lever may extend from the roller within the housing to a position outside of the housing and pass through a seal attached to the housing. The seal can be configured to include a first annular member configured for attachment to the housing adjacent to the lever and a lip seal attached to a housing sidewall adjacent the lever. A second annular member may be attached to the first annular member outside of the housing adjacent a portion of the lever. A deformable annular member may be attached between the first and second annular members and may be deformable to a plurality of different configurations in response to motion of the lever.

Abstract: A vertical roller mill has grinding rollers which roll over a grinding path of a rotatable grinding table, and a surrounding nozzle ring separation area for conveying and separating gas. A coarse fraction of ground material is entrained in gas upwards in ducts from a location that is below, at, or above the nozzle ring separation area and is transported into an entry to a material separator located above the grinding table.

Abstract: A vertical roller mill has grinding rollers which roll over a grinding path of a rotatable grinding table, and a surrounding nozzle ring separation area for conveying and separating gas. A coarse fraction of ground material is entrained in gas upwards in ducts from a location that is below, at, or above the nozzle ring separation area and is transported into an entry to a material separator located above the grinding table.