Study On The Effects Of Working Parameters On Grinding Performance In A Horizontal Stirring Mill

Horizontal stirring mill is the key equipment for preparation of ultrafine powder by mechanical method, It has been widely used in aerospace, mining and metallurgy, coating, paint and other industries because of its advantages of high energy utilization rate and low noise. Obtaining the ideal size of products at the same time reducing the power dissipation of stirring mill are the problem what many researchers in grinding field have been working on. However, the development of stirring mill is relative slow and the theory foundation is not perfect compared with the traditional ball mill. In addition, the grinding effect is the effect of the rotation, filling rate, material ball ratio and mediums’ physical properties of stirring mill. Long term since, the grinding theory of stirring mill has no great breakthrough.Therefore, in this paper the useful power of stirring mill was studied in-depth based on the research at home and abroad, and the effects of working parameters on the particle size of the product has been studied from the view point of experiment. Then the working parameters of mill has been optimized according to the rule. This paper selects three working parameters-speed, filling rate, ratio of material to ball which have main effect on the mill to study. Firstly, the useful power of stirring mill is studied theoretically based on the plastic dislocation theory and the Maxwell velocity distribution theory and establish the useful power model of the mill considering the material. Secondly, the experimental program is developed based the three factors’ Box-behnken design and expansion the experiment in a φ230×338 horizontal stirring mill, then the speed, filling rate, material ball ratio on the particle size of the grinding product and particle size distribution law is analyzed. Finally, the coarse telomere size, uniformity coefficient and specific energy consumption’s response surface regression model have established respectively, and find the corresponding parameter combination when three best values were achieved.The study found that the coarse telomere size obtain the best value of 5.20μm when the speed is 1210.27r/min, the filling rate is 0.74 and the material ball ratio is 0.6, the uniformity coefficient obtain the best value of 0.491 when the speed is 1367.88r/min, the filling rate is 0.67 and the material ball ratio is 0.9, and the specific energy obtain the best value of 0.094 when the speed is 1040.92r/min, the filling rate is 0.69 and the material ball ratio is 0.78. At the same time, the useful power model of the mill is verified according to the experiment result. These study will provide scientific basis for selecting working parameters for stirring mill in different industries’requirement.