عنوان مقاله [English]
Comminution circuit in concentrator No 2 at Follad Sirjan Iranian consists of a high pressure grinding rolls (HPGR) mill working in a closed circuit with a wet screen. The undersize from the screen enters a ball mill which works in a closed circuit with a hydrocyclone and MIMS. In this circuit, a ball mill with the diameter of 5.5 m fed by three hydrocyclones in a closed circuit is employed. In this research, the enhancement of the efficiency of comminution circuit was investigated by improving the efficiency of the grinding circuit. Therefore, the effect of mill feed rate on the grade and particle size of final concentrate was studied. Furthermore, the impact of power draw on the concentrate particle size was investigated. For this purpose, K80 and blain number were used to quantify the particle size. Moreover, a new approach based on mass balance was employed to estimate the mill feed flow rate. Results indicated that the hydrocyclone overflow particle size and the final concentrate particle size reduced while increasing the mill feed rate. Eventually, it was found that particle size of final concentrate was reduced while increasing the mill power draw.