Grid ball mill is adopted in the grinding link for the first-stage grinding for coarse particle products in the minerals dressing/beneficiation plant. The grid ball mill lined with grooved ring plate increases the contact surface of steel balls and ores and strengthens the grinding effect. The material is fed from the cylinder inlet and grinded by the impact and self-grinding of steel balls and ores. Because of the continuously feeding material, the pressure pushes material to the outlet and the