Large Discharge Opening Mineral Ore Mining Ball Mill Ball Milling Equipment . Grid ball mill description Discharging part of the grid ball mill is composed of the cover with hollow shaft neck, grid lining, wedge. block, center liner, shaft internal bushing and other parts.Grate discharge ball mill Alibaba Sponsored Listing 2.Description of grate discharge ball mill There are two ways of grinding the dry way and the wet way. The ball mill is used to grind many kinds of mine and other materials, or to select the mine. 4.Grate discharge ball mill features 1) Ball mill an efficient tool for grinding.