Numerical Simulation Analysis Of Ball Mill Medium Dynamics

Ball mill is an indispensable grinding and crushing equipment in mining,ceramics,cement and other industries,and also a high energy consumption equipment in the above industries.The annual power consumption of the ball mill reaches 5% of the total power generation in the country,and its high energy consumption has caused a huge demand in addition to its low grinding efficiency.The main factor that determines the energy consumption of the ball mill is the kinematic behavior of the grinding media.However,people have not yet fully mastered the complex grinding behavior of the ball mill.Aiming at the motion behavior of ball mill grinding media,this paper uses existing related software and discrete element methods to study the motion behavior of ball mill grinding media,aiming to seek the motion characteristics of ball mill grinding media and the changing law of the grinding process,in order to improve the ball mill Grinding efficiency and optimizing the working condition parameters of existing ball mills provide a certain theoretical and technical basis.The main research contents of this article include: the numerical simulation method proves the importance and necessity of the material in the numerical analysis of grinding;the design of a simulation test of the effect of the particle size of the material on the motion of the grinding medium,and the analysis of the effect of the particle size of the material on the movement path of the grinding medium Change process;using the discrete element Hertz-Mindlin with Bonding contact model to simulate the grinding process of the ball mill,analyze the ball mill grinding characteristics and the distribution of high-efficiency crushing areas in the mill;carry out the test of the influence of the working condition parameters on the grinding efficiency The influence of the three working condition parameters of rotation rate,filling rate and lifting bar height on the grinding efficiency of the ball mill.First of all,the feasibility and reliability of the numerical simulation method in this paper are verified by numerical simulation,and the differences of the medium movement track and speed between the two cases of whether there is material or not are compared.It is pointed out that the existence of material has an important influence on the grinding medium movement,which makes the grinding numerical analysis of the ball mill closer to the actual situation.At the same time,two groups of control tests are designed to analyze the material The influence of the particle size onthe grinding medium and the influence of the height of the lifting bar on the moving track of the grinding medium are determined.Then,using Hertz Mindlin with binding contact model,the simulation test of grinding process of ball mill is established,and the movement of grinding media and the change rule of grinding and crushing are obtained.At the same time,combining the distribution characteristics of the force of grinding media on materials,the distribution of high-efficiency crushing area and crushing characteristics of ball mill are pointed out.At last,a series of simulation tests are set up to simulate the process of material crushing,and the influence characteristics of three working conditions parameters on the grinding efficiency of the ball mill are obtained.The effects of the changes of the ball mill speed rate,filling rate and lifting bar height on the grinding efficiency of the ball mill and the change characteristics of the material crushing rate in the grinding process were analyzed.The research in this paper provides a reference for the numerical simulation design of the ball mill,which is of great significance to the design and grinding analysis of the ball mill.