Abstract: In order to improve the grinding efficiency of the mine and realize energy saving and consumption reduction, taking the high pressure roller milling-preconcentration concentrate of an iron mine as the research object,the ball mill and tower mill were used as the rough grinding equipment to carry out the grinding test. The results showed that :① when the ball mill is used for grinding and the grinding time is 200 s,the energy consumption of the newly generated -0. 074 mm product is 150. 08 kW· h / t,and the utilization coefficient of the mill -0. 074 mm is 0. 586 t / (m3· h). When the grinding time is 600 s, the energy consumption of the newly - 0. 074 mm product is 138. 53 kW· h / t, and the utilization coefficient of the mill -0. 074 mm is 0. 195 t / (m3· h). The yield difference of each grade of the products of the two grinding methods is mainly concentrated in +0. 150 mm and 0. 150~ 0. 074 mm. ② The appropriate tower grinding process parameters were determined by the optimization test as follow:grinding time of 300 s,grinding concentration of 60%,stirrer speed of 300 r / min,medium filling rate of 16. 15%,and material-ball ratio of 0. 166 4. Under this condition,-0. 074 mm utilization coefficient of the mill is 0. 625 t / (m3· h),and the energy consumption of the newly generated -0. 074 mm product is 53. 62 kW· h / t. Compared with the ball mill,the utilization coefficient of - 0. 074 mm is increased by 6. 66%,and the energy consumption of the newly generated -0. 074 mm product is reduced by 64. 27%. The research results could provide useful reference for the application of tower mill.