Influence of ball size distribution on grinding effect in horizontal planetary ball mill

• The law of ball size distribution (Dbsd) in the horizontal planetary ball mill is studied by the DEM, and takes the simulation results compared with the grinding test results, reveals practical significance of the simulation.
• We have obtained the specific rates of breakage can be determined by the mean contact force.
• Friction work reduces with the rise of the larger-size balls in Dbsd, and experiments show that contact area of the material also reduces, the finished product match Rosin–Rammler–Bennet (RRB) equation completely.

The law of ball size distribution in the horizontal planetary ball mill is studied by the discrete element method. The results show that the maximum impact energy could be acquired when filling rate is 24%, moreover the biggest mean contact force and the highest energy utilization ratio of balls could be acquired when the speed ratio is 1.5. The mean contact force increases with the proportion increasing of the large balls, which means ball size distribution has some effect on the crushing and grinding process. And according to the experimental results for comparative analysis, the specific rates of breakage Si increases with the proportion rise of large balls in ball size distribution, meanwhile Si can be determined by the mean contact force(Fmcf): Si=A·10kfmcfSi=A·10kfmcf, where the constant A is 0.437, the gradient k is 0.0252. At last the specific surface area of the product is measured and the particle size distribution (under 80 μm) is analyzed by Rosin–Rammler–Bennet equation. The results show that with the proportion increasing of the large balls, the specific surface area decreases, while the uniformity coefficient and the characteristic diameter increases.

The process of DEM simulations. The results of experimental: 1. Influence of Ball Size Distribution on Grinding Effect in Horizontal Planetary Ball Mill. 2. Jiaguan Zhang, Yang Bai, Hai Dong, QiongWu, Xuchu Ye. 3. The paper mainly studies the influence of ball size distribution on grinding effect in horizontal planetary ball mill by using a combination of DEM simulation and experimental methods.Figure optionsDownload as PowerPoint slide