Abstract:

Particles were mainly comminuted by ball mill within unconfined beds and nipped configuration was bound up with particle breakage. The experimental results and simulation show that the sizes of media balls and quartz particles have influences on the height of nipped bed, and the smaller ball and larger particle make the bed thin. A mathematical model that described the heights of nipped bed based on experimental data regression was proposed. The formula of the nipped range was deduced from the bed heights and self-locking of beds. The model and formula were validated using experimental data with good agreement.

Key words: nipped height of particle bed, nipped range, ball diameter, particle size

摘要：

颗粒的球磨粉碎以介质球间非限制料层破碎为主，料层的夹持特性与颗粒破碎密切相关。通过石英颗粒料层挤压实验和离散元仿真发现，介质球径和颗粒粒度对夹持料层厚度存在显著的影响：介质球径小则料层薄、颗粒粒度小则料层厚。通过对实验数据的回归分析，构建了石英颗粒的夹持料层高度计算模型；依据料层高度与料层自锁条件给出了料层夹持范围计算公式，计算模型和公式与料层挤压实验结果符合较好。

关键词: 夹持料层高度, 夹持范围, 球径, 颗粒粒度