Abstract: A ball-tube mill in which an inclined wall dividing the mill into coarse and fine grinding chambers occupied by grinding bodies has through holes for the passage of the material being ground provided in a portion of contact of the surface of the inclined wall with the grinding bodies present in the coarse grinding chamber. The through holes have a length much greater than their width with their elongated side running in parallel with an outer contour of the inclined wall.

Abstract: A ball tube mill includes a rotatable housing with a lined inside surface and end cover plates having an inlet hole and an outlet hole and accommodating at an angle to its longitudinal axis at least one perforated wall dividing the housing into coarse and fine grinding chambers charged with grinding bodies. The lined inside surface of the chambers has the form of truncated cones facing by their large bases the perforated wall, the angle of inclination of a generating line of the truncated cones equalling the angle of the slope of the grinding bodies present in the respective chamber, the volume of the coarse grinding chamber being smaller than the volume of the fine grinding chamber.