Research On The Optimization Of Grinding Product Particle Size Based On The Crushing Particle Size Of The High-pressure Roller Mill

In the concentrator,the crushing system consumes a large amount of energy,accounting for about 50% of the total energy consumption of the plant.The energy consumption of the ball mill accounts for more than half of the energy consumption of the grinding mill.Therefore,“more and less grinding” and “broken generation” "Mill" has always been an important direction for the research of mineral processing workers.In recent years,high-pressure roller mills have been rapidly developed and applied in the mining industry.The particle size of the crushed products has been significantly thinner,which has improved the grinding efficiency of the ball mill and the energy saving of the plant.With remarkable results,research on high-pressure roller mill products and subsequent grinding process systems to improve the efficiency of grinding operations,reduce unit steel consumption and power consumption,and increase the easy-to-select grade of minerals entering the sorting operation.Rate and monomer dissociation.The reduction of grinding energy consumption and the improvement of grinding operation quality are of great significance for reducing the cost of selecting plants and increasing the utilization rate of mineral resources.Based on the school-enterprise cooperation project “Based on the optimization of ball-milling steel ball ratio under the crushing granularity of high-pressure roller mill”,this paper investigates the literatures on high-pressure roller mills at home and abroad,and develops the crushing granularity based on high-pressure roller mill.Research on particle size optimization of grinding products.Firstly,the grinding test is carried out in the laboratory in the school,through the coarse grade +0.20 mm yield in the grinding product,the intermediate optional grade 0.20-0.010 mm yield,the intermediate easy-selection grade 0.10-0.028 mm yield,over-grinding-The comprehensive comparison of the yield of 0.010 mm and the fineness of-0.074 mm shows that the optimal initial loading of the ?4.8×7.0m ball mill is ?70: ?60: ?50: ?40: ?30=20:30:25:10 :15;3.6 × 6.0m ball mill best initial loading ball is ?80: ?70: ?60: ?50: ?40=20:30:25:10:15,according to theoretical research and actual situation on the site ?4.8×7.0m The mill adds the ball load to ?70: ?60: ?50 = 50: 20: 30,? 3.6 × 6.0 m mill plus ball load is ?80: ?70: ?50 = 50: 30: 20.On the basis of the laboratory grinding test,the best initial ball-loading scheme of the two mills was selected,and the grinding kinetics study was carried out together with the on-site program to verify the grinding effect of the laboratory.The grinding kinetics test was different in different schemes.Under the time,the particle size composition of the grinding products at different times of different schemes was sieved and analyzed,and finally the influence of the k value of the kinetic parameters on the grinding rate was greater than the m value,and each of the two ball optimal ball loading schemes was obtained.The k value of the narrow particle size is larger than the k value of the on-site ball-loading scheme;the particle size of the grinding products at each time of the three schemes is analyzed,and the optimal initial loading of the two mills is obtained with the extension of time.The optimization effect of the scheme is more and more obvious.When the time reaches a critical value,the rate of excessive coarse fraction reduction and fineness increase between the three schemes is basically the same.The results of the laboratory research were applied to the plant for industrial application,and the steel balls in the two ?4.8×7.0m overflow ball mills and one ?3.6×6.0m overflow ball mill were replaced at one time.The results of industrial tests show that:(1)After the operation of the high-pressure roller mill,the efficiency of the ball mill has been significantly improved.The efficiency of the 1# ball mill has increased from 245.47 t/h to 348.57 t/h,an increase of 42.00%;2# ball mill The efficiency of the station increased from 248.25 t/h to 343.18 t/h,an increase of 38.24%;the efficiency of the 3# ball mill increased from 116.75 t/h to 146.01 t/h,an increase of 25.06%,thus reducing the grain size of the ball mill after grinding.The processing capacity of the machine will be greatly improved,which is in line with the principle of “multiple crushing and less grinding”;(2)the difficulty of selecting +0.10 mm coarse particles in the overflow is reduced by 5.5 percentage points,and the easy selection of the grain size is-0.1+0.038 mm.Increase by 1.8 percentage points;(3)1#,2#,3# ball mill steel ball consumption has a different range of reduction,respectively decreased by 12.09%,6.41%,5.41%,after replacing the steel ball with a high-chromium ball,grinding The unit consumption of the steel ball was significantly reduced,and the 1#,2#,and 3# ball mills were reduced by 43.74%,38.36%,and 44.29%,respectively.