Our ball mills are designed according to the overall advantages and disadvantages of the open circuit comminution system. For the equipment, we adopt bearings with both film fluid lubrication and hydrodynamic lubrication as well as bearings with hydrodynamic lubrication only, diversified types of driving units, new abrasion-resistant materials and manufacturing processes. Now we can design and manufacture ball mills with diameters ranging from Φ4m~Φ8m.