Abstract: A tube mill for wet-grinding of lumpy material. The tube mill can have a mill cylinder, an inlet opening for charging the lumpy material, a means for adding an aggressive medium and a discharge opening. In addition, the mill cylinder can have an internal lining of epoxy material and the means for adding an acid to the lumpy material in the region of the inlet opening.

Abstract: The invention relates to a tube mill for the wet grinding of lumpy material with a grinding cylinder, an inlet opening for inlet of lumpy material, means for addition of an aggressive medium and also an outlet opening (5), wherein the grinding cylinder has an internal lining of epoxy material.

Abstract: A lifting wall for a tube mill which has a discharge means with lifting vanes in order to transport the material being ground to discharge openings by the rotary movement of the tube mill. The lifting vanes are disposed obliquely with respect to the radial direction so that the material being ground slides promptly to the center where it is discharged through the discharge openings still below the horizontal longitudinal central plane of the tube mill. The lifting vanes are substantially flat and bent like blades in a region of the discharge openings.

Abstract: A roll mill has a fixed roll journalled in stationary fixed bearings and a floating roll journalled in movable bearings enabling the floating roll to be pressed against the fixed roll under high pressure. An adjustable spacing arrangement is provided between the two bearings to enable a gap of selected width to be formed between the rolls. The spacing arrangement includes a pair of shaft-like distance members received and guided in associated bores of the fixed bearings for movement therealong. Free ends of the distance members extend outward of their bores and engage the opposing floating bearings to adjust the positions of the rolls as they wear so as to maintain the selected gap width. The free ends are retractable into the bores to allow the bearings to abut one another and thereby optimize the wear life of the rolls.