Research on key factors of kinematic law of tower mill’s media based on laboratory experiments and discrete element method, J. He, S. Lu, Q. Zhu, D. Wang, X. Sun, and J. Yao
- Organization:
- The Southern African Institute of Mining and Metallurgy
- Pages:
- 14
- File Size:
- 4020 KB
- Publication Date:
- Jan 1, 2020
Abstract
Tower mill is considered to have a better regrinding and fine grinding effect compared with ball
mill, and its application is much broader. The spiral agitator of the tower mill is driven by the motor.
Media inside the mill is under the combined actions of the spiral mechanism, the cylinder, and media
nearby, and these parameters are key factors affecting the grinding effect. However, it is not possible to
obtain detailed information of kinematic law of media based only on traditional laboratory experiments,
let alone the relationship between parameters of kinematic law of media and grinding effect.
Experimentation is the only way to develop industrial equipment. However, this is time-consuming and
costly, which hampers the further research of the tower mill’s grinding mechanism.
The paper selects two structural parameters (gap between the edge of the spiral agitator and the
cylinder wall, ratio between the diameter of cylinder and that of the spiral shaft.) and three operating
parameters (diameter of media, filling ratio, the speed at the edge of the spiral agitator) as variables to
do an orthogonal designed experiment of five factors, four levels, and thereby obtaining change law of
grinding indicators of different parameters. Experimental equipment may be simplified to enable an
applicable simulation strategy. Simulation based on a discrete element method is conducted to obtain
the change law of the speed of media, collision frequency, normal force, and radial force. The relational
curve between parameters of kinematic law of media and energy consumption of grinding is clarified,
and key factors affecting grinding efficiency are determined. Those factors will be used for optimising
the design and operating process. The research result of this paper obtained from laboratory experiments
and computer simulation provides data support and theoretical bases, and has directive meaning and
applicable value for tower mill’s optimisation and large-sized design.
Keywords: Tower mill, discrete element method, kinematic law of media, energy consumption of
grinding
Citation
APA: (2020) Research on key factors of kinematic law of tower mill’s media based on laboratory experiments and discrete element method, J. He, S. Lu, Q. Zhu, D. Wang, X. Sun, and J. Yao
MLA: Research on key factors of kinematic law of tower mill’s media based on laboratory experiments and discrete element method, J. He, S. Lu, Q. Zhu, D. Wang, X. Sun, and J. Yao. The Southern African Institute of Mining and Metallurgy, 2020.