The structure of the overflow ball mill is basically the same as that of the lattice ball mill, except that there is no discharge lattice at the discharging end of the cylinder. Furthermore, the surface of the hollow journal bushing is equipped with an inverse spiral blade, which can return the spilt balls and coarse ores from the slurry to the mill. The grinding product of the overflow ball mill is free overflow through the discharge hollow journal. For this reason, the level of slurry in the cylinder must be higher than the lowest busbar level of the discharge shaft neck.
