... big gearwheel is made by cast hobb New Ball MillThe ball mill is widely used to grind various medium-hard ... mining, building materials, chemical industries, etc. The ball mill can be divided into dry type and wet type ... , red iron tailings and brown iron tailings with 20% iron can be processed into 57-59 grades iron ... iron and 4%-6% copper,and get 18-20 grade copper and 57-59 grades iron, and the ...