Discrete Particle Simulation of Particle Flow in the IsaMill Process

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• 作者：C. T. Jayasundara ; R. Y. Yang ; A. B. Yu ; D. Curry
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2006
• 出版时间：August 30, 2006
• 年：2006
• 卷：45
• 期：18
• 页码：6349 - 6359
• 全文大小：766K
• 年卷期：v.45,no.18(August 30, 2006)
• ISSN：1520-5045

文摘

IsaMill is a high-speed stirred mill that has been newly developed in the mineral industry for fine and ultrafinegrinding. In this paper, a numerical model that is based on the discrete element method (DEM) was developedto study particle flow in a simplified IsaMill. The DEM model was validated by comparing the simulatedresults of the flow pattern, mixing pattern, and power draw with those measured from a same-scale laboratorymill. Spatial distributions of microdynamic variables related to flow structure such as local porosity andforce structure such as particle interaction forces, collision velocity, and collision frequency in different regionsof the mill were analyzed. The results showed that particles near disks move more vigorously than thoseclose to side walls. Large velocities were observed in the vicinity of the disks, with the tangential componentbeing dominant, followed by the radial velocity. While high collision frequency occurred in the region betweendisks, high collision energy occurred near disks. Among the three contact forces analyzed, the maximumcontact force was more representative and could be related to the collision energy. An attempt was also madeto correlate the collision energy and frequency with the measurable variables such as local velocity and porosity.The findings are useful to understanding the flow of particles and its relation to particle-particle interactionsand grinding performance in IsaMill.