A grate-type ball mill has a grate plate at the discharge end with numerous small holes to allow slurry to drain. Near the discharge end, a slurry lifting device is installed on the grate plate. This device consists of radial ribs that divide the space between the grate plate and the end cover into several sector-shaped chambers leading to the hollow journal. As the mill rotates, the ribs lift the slurry discharged through the holes in the grate plate to the hollow journal at the discharge end. The main characteristic of this mill is forced discharge, resulting in high production capacity. This type of mill is typically used in the first stage of grinding operations to achieve high processing capacity, but the product particle size is coarser than that of an overflow-type ball mill.