Abstract: In view of the low production capacity and poor grind fineness of Yunnan Shizishan Copper Concentrator, accurate ball loading and addition method was used to improve the ball loading and addition of the two-stage grinding. The industrial test results indicate that the adoption of the new method can bring a grinding mill production capacity increase by 9％, grinding product fineness improvement by 7.88 percentage points, unit consumption reduction of grinding media by 10.42%, power consumption reduction of the total concentrator by 10.81%, and increase of copper recovery by 2.98 percentage points, a remarkable economic benefit. Accurate ball loading and addition method|Duan's semi-theory formula|Grinding mill capacity|Grind

Key words: fineness, Electricity consumption, Ball consumption