Experimental study the impact forces of tumbling mills

Author:

Soleymani MM1,Fooladi Mahani M1,Rezaeizadeh M2

Affiliation:

1. Mechanical Engineering Department, Shahid Bahonar University, Kerman, Iran

2. Mechanical Engineering Department, Graduate University of Advanced Technology, Kerman, Iran

Abstract

Impact forces are one of the mechanisms for grinding in mill. This takes place when the particles elevated by the lifters get into cascade motion and their fall on the load causes the breakage of other particles. The present paper aimed to study the impact forces in terms of variables like: mill speed, solid charge filling (ball filling), slurry concentration, and slurry filling. In this work, the influence of these operating parameters was investigated using a pilot mill. To this end, a copper ore was used to prepare slurry at different solid concentration. The tests covered a range of slurry filling from 0 to 2 with five different balls filling between 12% and 36% of mill volume and six different speeds between 60% and 85% of critical speed. The results delineate that the increase in the mill speed leads to a remarkable increase in the amount and frequency of the impact forces. Increasing the charge volume leads to decrease the maximum impact forces. The results show that with the increase in slurry filling and the resulting formation of a pool, the impact forces will decrease. Moreover, it is found that with the increase in slurry concentration, the slurry will act as a damper decreasing the impact forces.

Publisher

SAGE Publications

Subject

Industrial and Manufacturing Engineering,Mechanical Engineering

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1. Modelling the power draw of tumbling mills: A comprehensive review;Physicochemical Problems of Mineral Processing;2022-06-25

2. Rod Mill Product Control and Its Relation to Energy Consumption: A Case Study;Minerals;2022-01-30

3. Experimental Study of Operational Parameters on Product Size Distribution of Tumbling Mill;Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering;2021-12-14

4. Establishing the effect of a decrease in power intensity of self-oscillating grinding in a tumbling mill with a reduction in an intrachamber fill;Eastern-European Journal of Enterprise Technologies;2019-11-12

5. Towards a Pool-based Model of Volumetric Slurry Hold-up for Cylindrical Ball Mills;Mineral Processing and Extractive Metallurgy Review;2019-07-29

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