Analysis of particle motion characteristics in Henan Hongxing ball mill

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Analysis of mixing motion characteristics of granular materials in ball mill

Ball mill It is widely used in the coal pulverizing system of thermal power plants in China, and is widely used in other industries. According to the abrasive principle of ball mill, the abrasive efficiency of ball mill depends on the contact efficiency between abrasive medium and granular material. The mixing uniformity of granular materials directly reflects the contact efficiency between particles: the higher the contact rate is, the better the mixing degree is. The mixing motion of granular materials in ball mill is very complex, and it is affected by gravity, centrifugal force, friction force and mechanical resistance. The particle motion characteristics in the mill are analyzed below.

 Ball mill

The discrete element method can be used to simulate the mixing process of particles in the ball mill. The three-dimensional mathematical model is established by tracking each particle in the ball mill, considering its gravity, friction and collision force. The influence of particle size, particle density and uneven particle size on the mixing characteristics of particles in the ball mill is emphatically discussed, revealing the complexity of the ball mill The mixing motion of particles was studied.

 Ball mill

Through the research and analysis of the above process, it is found that with the increase of the rotation number of the ball mill, the particles in each region gradually mix evenly. The particles in the near wall area are directly affected by the wall of the ball mill. Under the action of centrifugal force and friction force, the particles are lifted to a certain height by the armor, and then the particles are dropped freely under the action of gravity, falling and bumping on the particles below, mostly staying on the surface of the material layer (internal area). At the same time, with the rotation of the ball mill, when the inclination angle of the material layer is equal to or greater than its natural inclination angle, the particles in the inner region begin to fall down and just fall to the area near the wall and contact with the wall directly. In this way, the particle exchange between the inner region and the near wall region is formed, and the particle mixing motion is intense. However, the particles in the middle region are not directly affected by the side wall, only under the action of gravity and collision friction between particles, there is a small amount of particles exchange with the near wall area and the internal area, and the particle mixing movement is not intense. Therefore, the intensity of particle mixing in different regions of the ball mill is different, which leads to the particle mixing uniformity in the near wall region is better than that in the internal region.

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