Abstract:According to the ore characteristics of a gold mine in Qingdao, an accurate ball loading scheme was obtained through theoretical calculation, and the effects of grinding time, grinding concentration and steel ball filling rate on the efficiency of grinding technology were investigated. The results show that when the optimum condition was grinding time of 16min, the grinding concentration of 65%, the steel ball filling rate of 40%, and steel ball proportioning scheme with m(Φ90):m(Φ70):m(Φ50):m(Φ30) of 20:25:40:15, the obtained grinding technical efficiency was the best. Different steel ball proportioning schemes (recommended scheme, on-site scheme, larger scheme and smaller scheme) were used for grinding test, and the flotation comparison test was conducted for the grinding products of the recommended scheme and the on-site scheme. The test results show that the recommended scheme can effectively optimize the particle size distribution of grinding products, and the gold grade and gold recovery were 3.92g/t and 1.65% higher than that of the field scheme. The gold concentrate with a grade of 66.21g/t and a recovery of 95.01% was finally obtained by closed-circuit test. The research results can provide reference and guidance for the optimization of on-site grinding parameters.