Abstract The micro-processes inside comminution machines are decisive for the grinding result and the overall process efficiency. Especially the estimation of the amount of particles which is captured and stressed between colliding grinding media is of great interest in order to model and optimize the mill operation for dry fine grinding processes. This study investigates the capturing of fine dry particles by means of simplified experiments using a drop-weight tester: While an increase of both the powder flowability and the material fineness were shown to enhance the displacement of the particles out of the zone between a static plate and a falling ball, higher impact velocities and larger media sizes increase the particle capturing. Additionally, the capturing becomes more dependent on the above-mentioned parameters for finer feed materials. Finally, an extension of the active-volume-model, originally developed by Schonert, was proposed to describe the impact of those parameters more adequately.

中文翻译：

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通过落锤试验评估研磨介质之间干燥细颗粒的捕获

摘要 粉碎机内部的微细加工过程对磨削效果和整体加工效率具有决定性作用。尤其是对在碰撞研磨介质之间捕获和受压的颗粒数量的估计，对于模拟和优化干式细磨过程的磨机操作具有重要意义。本研究通过使用落锤测试仪的简化实验研究了细小干燥颗粒的捕获：同时显示粉末流动性和材料细度的增加会增强颗粒从静态板之间的区域移出下落的球、更高的冲击速度和更大的介质尺寸会增加颗粒捕获。此外，对于更细的进料，捕获变得更加依赖于上述参数。