Abstract: The technological mineralogical analysis of regrinding feeding ore in Gongchangling Concentrator shows that the TFe grade is 53.10%， mainly in the form of magnetite， and the content of iron ore in fine grains is high， which indicates that the ore needs to be fully grinded to dissociate the monomer containing iron ore in order to obtain a good separation index. The suitable grinding parameters of stirred mill were studied. The results showed that the suitable grinding parameters were with 75% filling ratio， material to ball ratio is 0.8， grinding concentration is 70% and 6 mm ceramic balls. When the content of grinding product -0.038 mm is above 80%， good economic and technical indexes can be obtained after one stage magnetic separation.

Key words: Stirred mill, Ceramic ball, Specific production rate, Grinding efficiency