Abstract:In view of the optimization test study of the first section of the ball milling index of an iron ore mine in Shanxi, the mechanical properties of the ore were determined, and the ball mill was screened. According to the semi-theoretical formula of section ball diameter, the recommended scheme of the preliminary ball was determined as m(Φ60): m(Φ50): m(Φ40): m(Φ30)=15:20:25:40. The field scheme, the larger scheme and the smaller scheme were set as the comparison. Through the grinding comparison test, it was concluded that compared with the field scheme, the yield of + 0.10mm coarse particle grade was reduced by 14.53% and the yield of middle optional grade (-0.10+ 0.020mm) was increased by 22.26%. The yield of intermediate easy separation grade (-0.074+0.020mm) was increased by 15.72%, the over-grinding rate of -0.020 mm was reduced by 7.75%, and the grinding technical efficiency was increased by 29.03%.