论文信息 - Analysis of Effect of Pin Configuration on Beads Motion in a Stirred Mill by DEM

Analysis of Effect of Pin Configuration on Beads Motion in a Stirred Mill by DEM

Beads motion in a stirred mill filled with a slurry was simulated by the Discrete Element Method (DEM), enabling to calculate the impact energy of beads. Since the specific impact energy of beads is known to be well correlated with the grinding rate constant, it was monitored as an effective index of grinding performance in the simulation work. The present work is to investigate effect of the pin configuration, particularly, the number of pins attached on the agitator and their length on the beads motion as well as the impact energy. The pins were attached on the axis of the agitator equi-interval in the circumference direction and 3-line in the horizontal axis in the mill. We have found that the beads motion is dependent on the number of pins, and the specific impact energy reaches the maximum value at 8 in number of pins under the present condition. In addition, the maximum value under the specific impact energy is shifted towards large number of pins as the beads filling ratio increases. The specific impact energy of beads is increased with an increase in pin length.

[1] P. Cundall,et al. A discrete numerical model for granular assemblies , 1979 .

[2] J. Kano,et al. Estimation of Size Reduction Rate of Gibbsite in Tumbling Mills with Different Diameters by Computer Simulation , 1999 .

[3] Arno Kwade,et al. Wet comminution in stirred media mills — research and its practical application , 1999 .

[4] Y. Tsuji,et al. Discrete particle simulation of two-dimensional fluidized bed , 1993 .

[5] Christine Frances,et al. On modelling of submicronic wet milling processes in bead mills , 2004 .

[6] Junya Kano,et al. Ball mill simulation in wet grinding using a tumbling mill and its correlation to grinding rate , 2004 .

[7] Runyu Yang,et al. DEM simulation of the flow of grinding media in IsaMill , 2006 .

[8] Junya Kano,et al. Correlation of powder characteristics of talc during Planetary Ball Milling with the impact energy of the balls simulated by the Particle Element Method , 1998 .

[9] Jörg Schwedes,et al. Theoretical and experimental investigation on particle and fluid motion in stirred media mills , 1999 .

[10] R. Hogg,et al. Breakage mechanisms and mill performance in ultrafine grinding , 1999 .

[11] Ecevit Bilgili,et al. Nano-milling of pigment agglomerates using a wet stirred media mill: Elucidation of the kinetics and breakage mechanisms , 2006 .