Abstract: In order to find out the influence of ore properties on iron separation production and solve the bottleneck restricting the grinding capacity of ball mill process，aiming at the problems of grinding clas⁃ sification，iron concentrate demagnetization and old production process in iron separation process，the com⁃ bined classification process of cyclone and high-frequency fine screen was reformed，and the proportion of steel balls in ball mill，the optimization of steel ball supplement system and the transformation of threestage grinding were carried out，which effectively dissociated mineral crystals，improved the efficiency of mill and increased the content of intermediate easy-to-separated particle size.Optimization and innovation of iron-dressing process gradually adapt to the mine' first rich then poor，first easy then difficult' mining trend，enhance the bearing capacity of mineral processing system，stabilize the quality of iron concentrate， release the iron production capacity at the same time，reduce the production cost of iron concentrate.

Key words: grinding classification, vanadium titanium magnetite, steel ball ratio, combination classifi? cation