Study on collisions of steel balls in grinding mill at different rotation speeds

被引：0
|
作者：
Li T. [1 ]
Lin S. [1 ]
Zhang B. [1 ]
Zhang J. [1 ]
Jiao F. [1 ]
Qin W. [1 ]
Zhang Y. [1 ]
机构：
[1] School of Minerals Processing and Bioengineering, Central South University, Changsha
来源：
Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology) | 2019年 / 50卷 / 02期
基金：
中国国家自然科学基金;
关键词：
Ball grinding mill; Collision; DEM (discrete element method); Rotation speed;
D O I：
10.11817/j.issn.1672-7207.2019.02.001
中图分类号：
学科分类号：
摘要：
Through theoretical calculations of steel balls in the outmost layer and DEM (discrete element method) simulations on ball grinding mill of which the effective internal diameter is 5.35 m, the effects of rotation speeds on the motion of steel balls and collisions in the ball mill were studied. The results show that the leaving angle, the landing angle, the falling height of steel balls, the kinetic energy at the landing point, the impact energy and the attrition energy depend on rotation speed of ball grinding mill when the steel ball is thrown off. The numbers of balls in throwing motion increase obviously with the increase of rotation speed, and the frequency of high collision energy and average collision energy also increase with the increase of rotation speed, which is beneficial to the grinding of the harder and larger size of ore. However, the energy loss proportion of ball-ball and ball-liner collisions is promoted. The energy loss proportion of ball-rock collisions is reduced, which will reduce the energy utilization of mill and the service life of liner, and will increase the loss of steel. © 2019, Central South University Press. All right reserved.
引用
收藏
页码：251 / 256
页数：5
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