Investigation of the effect of filling level on the wear and vibration of a SAG mill by DEM--颗粒学报PARTICUOLOGY

Xie, C., Zhao, Y., Song, T., & Zhao, Y. (2022). Investigation of the effect of filling level on the wear and vibration of a SAG mill by DEM. Particuology, 63, 24-34. https://doi.org/10.1016/j.partic.2021.04.009

Investigation of the effect of filling level on the wear and vibration of a SAG mill by DEM

Changhua Xie ^{a 1}, Yuan Zhao ^{a 1}, Tao Song ^{b c}, Yongzhi Zhao ^a^*

a Institute of Process Equipment, Zhejiang University, Hangzhou 310027, China
b State Key Laboratory of Process Automation in Mining & Metallurgy, Beijing 100160, China
c Beijing Key Laboratory of Process Automation in Mining & Metallurgy, Beijing 100160, China

10.1016/j.partic.2021.04.009

Volume 63, April 2022, Pages 24-34

Received 21 December 2020, Revised 18 February 2021, Accepted 9 April 2021, Available online 9 May 2021, Version of Record 18 November 2021.

E-mail: yzzhao@zju.edu.cn

Highlights

• Influence of filling level on material movement behavior in SAG mill is analyzed.

• Influence of filling level on grinding performance is analyzed with collision energy.

• Influences of filling level on liner and grinding media wear are analyzed.

• The vibration of mill is discussed based on the collision energy on liner.

Abstract

Semi-autogenous grinding (SAG) mill is widely used in the grinding process of coal and ores because of its strong applicability, large capacity and low consumption of grinding media. Therefore, the research of SAG mill is still of great important practical significance. Among those parameters of the SAG mill, the filling level is very important for it is not only directly related to the processing capacity of the mill, but also affects the operation cost and stability of mill. In this paper, combined with shear impact energy model (SIEM) and discrete element method (DEM), the particle collision energy spectrum was applied to analyze the influence of ore filling level and media filling level on the power draw of the mill, the impact energy on ore, and the wear of liner and media in a slice of an industrial SAG mill. It was found that increasing the ore filling level would increase energy consumption and reduce the energy efficiency and the wear of liner and grinding media. Furthermore, the vibration of mill was explored from the collision energy on liner. The results showed that the low frequency but high energy collision between grinding media and liner was the main reason for liner wear and mill vibration.

Graphical abstract

Keywords

Filling level; SAG mill; Collision energy; DEM; Wear; Vibration

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