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Advanced comminution modelling: part 2 - mills
Applied Mathematical Modelling ( IF 5 ) Pub Date : 2020-12-01 , DOI: 10.1016/j.apm.2020.06.048
Paul W. Cleary , Sharen J. Cummins , Matt D. Sinnott , Gary W. Delaney , Rob D. Morrison

Abstract This second part paper explores rock breakage mechanisms, the life cycle of rocks in mills and the strong influence of end walls on charge motion within mills. We present recent advances in particle-based modelling of mills for comminution focused around wear and the effect of slurry and slurry phase grinding. Three mill scenarios are considered: 1. Media flow and the resulting wear evolution of the belly and end wall liners and the resulting change in mill performance for a full industrial scale dry ball mill (modelled using DEM) 2. Axial slurry transport and mixing in a wet overflow industrial scale ball mill (modelled using fully coupled DEM and SPH) 3. Effect of mill speed on slurry and solid charge motion and the resulting grinding of fine particles in a 1.8 m diameter wet Hardinge pilot mill (modelled using fully coupled DEM and SPH with advection-diffusion-population balance equations solved for the slurry size distribution for each SPH particle) These demonstrate the nature and level of fidelity that is now possible to include in particle-scale comminution models. They provide insights into the critical importance of curtain flows generated by the end walls of tumbling mills, on wear behaviour on liners, on the structure of slurry pools and mill discharge and on the adverse effect on grinding of increasing mill speed.

中文翻译:

高级粉碎建模:第 2 部分 - 磨粉机

摘要 第二部分论文探讨了岩石破碎机制、磨机中岩石的生命周期以及端壁对磨机内装料运动的强烈影响。我们介绍了基于颗粒的磨机粉碎建模的最新进展,重点围绕磨损以及浆料和浆料相研磨的影响。考虑了三种磨机情况: 1. 介质流动以及由此产生的机腹和端壁衬板的磨损演变以及由此产生的全工业规模干式球磨机的磨机性能变化(使用 DEM 建模) 2. 轴向泥浆输送和混合湿式溢流工业规模球磨机(使用完全耦合的 DEM 和 SPH 建模) 3. 磨机速度对浆料和固体进料运动的影响以及由此产生的细颗粒在 1. 8 m 直径湿法 Hardinge 中试磨(使用完全耦合的 DEM 和 SPH 建模,通过对流-扩散-种群平衡方程求解每个 SPH 颗粒的浆料尺寸分布)这些证明了现在可以包含在颗粒中的性质和保真度水平- 规模粉碎模型。它们提供了对滚磨机端壁产生的帘流的关键重要性、衬板的磨损行为、浆池和磨机排放的结构以及提高磨机速度对研磨的不利影响的见解。
更新日期:2020-12-01
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