Semi-self-grinding rod ball medium

The invention relates to a semi-self-grinding rod ball medium, and belongs to the technical field of ore grinding of mineral processing. The semi-self-grinding rod ball medium takes the shape of a rod ball body that two ends of the rod ball body are in the shape of spherical surfaces, and the middle of the rod ball body is in the shape of a circular truncated cone; the equivalent diameter of the semi-self-grinding rod ball medium is 175mm, the height H1 of a lower spherical cap is 57.5mm, the height H2 of an upper spherical cap is 22mm, the height H3 of the circular truncated cone is 183mm, the diameter D1 of the lower spherical cap is 163mm, the diameter D2 of the upper spherical cap is 73mm, and an inclined angle alpha between a bevel edge of the circular truncated cone and a central line is 14 degrees. The semi-self-grinding rod ball medium has the advantages that the semi-self-grinding processing capacity is improved, the over-crushing yield of ground products is reduced, and the unit consumption of the m