The energy efficiency of dry fine grinding process of powders dramatically declines with decreasing particle size, and represents a growing concern in various cutting-edge technical applications for pharmaceutical and cosmetic products, advanced-ceramics, and food industry. In this paper, we report on a detailed experimental analysis of the long-term grinding behavior of silica sand as a model material in an oscillatory ball mill for a broad range of the values of vibration frequency and amount of powder. We show that the re-agglomeration of fine particles unambiguously explains the anomalous increase of grinding power consumption. We also find that the agglomeration phenomena are correlated with the volume fraction of the class of finest particles. A nonlinear comminution model is shown to capture this effect for the prediction of the evolution of the specific surface area.

中文翻译：

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硅砂干法球磨过程中磨削能和粒度的演变

干粉细磨过程的能源效率随着粒径的减小而急剧下降，并且在制药和化妆品、先进陶瓷和食品工业的各种尖端技术应用中日益受到关注。在本文中，我们报告了对作为振荡球磨机模型材料的硅砂长期研磨行为的详细实验分析，其振动频率值和粉末量值范围很广。我们表明细颗粒的重新团聚明确解释了研磨功耗的异常增加。我们还发现团聚现象与最细颗粒类别的体积分数相关。