Research On Energy Matching Between Ball Media And Ore Crushing Energy In Dexing Copper Mine Based On Discrete Element Method

Ball mill is still selected as the main grinding equipment by most concentrator because of its simple equipment structure,simple operation method,large crushing ratio,large processing capacity and other advantages.However,Ball mill has the problems of low grinding efficiency,high energy consumption and so on.In order to solve this problem,this paper studies the energy matching between grinding media and ore crushing in Dexing Copper Mine based on discrete element method by referring to many references at home and abroad.The ?3.2 × 3.1 meter lattice ball mill in Dexing Copper Mine of Jiangxi Copper Company was selected as the industrial research object.the theoretical grinding medium proportioning scheme was obtained by empirical formula calculation.the experimental results show that the recommended scheme has the best grinding effect.The discrete element software is used to simulate and analyze the recommended scheme and field scheme with the best experimental effect,and the relationship between the size of steel ball and the collision energy between ore particles is studied.The comparison test results show that the grinding effect of the recommended scheme ?70:?50:?40:?30 = 20:30:20:30 for Dexing Copper Mine is the best,the coarse grade yield of the recommended scheme + 80 mesh is the lowest in the laboratory comparison test,only 4.02 %,while the +80-400 mesh easily-selected grain grade yield is the highest,reaching 66.78 %,the yield of the-400 mesh ultra-fine grade is very low,being 18.11 %,the content of-200 mesh is 47.6 % higher than the on-site yield,and the grinding effect is better.After three months of industrial comparative test,compared with 7# mill for production,8# mill for test has basically the same effect.although the content of-200 mesh is reduced by 1.1 percentage points,the content of-400 mesh ultra-fine particles is reduced by 2.1 percentage points,the content of-80 mesh ultra-coarse particles is reduced by 1.83 percentage points,and the content of easy-to-select particles in the middle of 80-400 mesh is increased by 3.93 percentage points.the optimization effect of 8# mill is obvious.The recovery rate of coarse concentrate in flotation pilot test increased by 1.02 percentage points on average.The laboratory test mill was simulated,the simulation data were sorted and the collision energy map was drawn.the size of ?100:?80:?60=30:40:30 grinding medium scheme used in the field was obviously larger.the collision energy distribution of 12 mm,8 mm,5 mm and 2 mm ore particles was not as good as the recommended scheme,and the phenomenon of over-pulverization was easy to occur.the rationality of the test results was verified from the angle of energy matching.