The purpose of this research is to investigate the characteristics of import Ball Mill which is used at cement mills in Indonesia. There were two kind of import Ball Mill from PT. Semen Gresik, Tbk that used in this research which are A type (Ã˜ 30 mm) and B type (Ã˜ 40 mm).
The feed to ball mills (dry basis) is typically 75 vol. % ore and 25% steel. The ball mill is operated in closed circuit with a particle size measurement device and size control cyclones. The cyclones send correct size material on to flotation and direct oversize material back .