FIELD: mechanical engineering. SUBSTANCE: ball mill has horizontal axis of rotation. It includes drum supported by two journals having the same axis of rotation and positioned on respective ends of drum. Cylinder is positioned coaxially inside each journal so that it is open into drum. Space lying between each journal and its cylinder is coupled with outlet one through separator. Guiding member is positioned under operating pipeline. Cylinder has rigid Archimedean screw on its internal surface. Main air supply device is provided on operating pipeline. The device is located upstream from separator, and entire air is directed inside cylinder. EFFECT: enhanced efficiency. 2 dwg
