Abstract: The continuously operating stirred ball mill used for finely and very finely milling a material has a cylindrical or conical grinding chamber which has a horizontal axis and in which a stirrer rotatable about the chamber axis and intended for moving grinding media present in the grinding chamber is arranged. The known stirred ball mills have the disadvantage that the grinding media are entrained in the direction of the outlet by the material stream passed through from the inlet to the outlet, with the result that said grinding media accumulate in the region of the material outlet and thus lose their grinding effect and adversely influence the milling process. In contrast, the stirrer of the ball mill according to the invention has paddlewheel-like stirring members or propeller-like stirring members formed with separating and guiding disks.

Abstract: An agitator-type ball mill has a circumferential wall which bounds a working chamber having an axis and includes two radially spaced jackets which form therebetween a gap for receiving a heat-exchange medium. The jackets are releasably connected with one another so that they can be separated from each other by displacement in an axial direction. A flexible member is arranged in the gap between the jackets, connected with one of the jackets, and forms a substantially helical passage in the gap. The heat exchange medium flows through the thus-formed helical gap. The flexible member may be formed by a band which is inserted in a helical groove provided in one jacket and extends radially into the gap so as to abut against the other jacket with prestress.