Effect of the operating parameter and grinding media on the wear properties of lifter in ball mills

Abstract

The wear of lifter in ball mill directly affects the grinding efficiency and economic cost. However, how to evaluate the variation of wear process and predict the wear distribution of lifter is poorly developed. To this end, a laboratory-scale ball mill was used to evaluate the variation of wear process of the lifter in different milling conditions of mill speed, ball filling, grinding media size and shape. Besides, a wear prediction method was used to compare and validate the experimental results. The experimental results showed that the Abbott-Firestone curve can evaluate the lifter surface topography. The wear rate of the lifter specimen is increased first and then decreased with mill speed and grinding media size. Increasing ball filling will increase the wear rate, and the grinding media shape of ball has a maximum wear rate. The wear characteristics of the lifter specimen are consisting of impact pit, indentation, plastic deformation and scratch. Furthermore, the discrete element method (DEM) simulation showed that the wear behavior on the upper surface is higher than that on the side surface of the lifter. The DEM simulation with Archard wear model is an effective tool to investigate the wear distribution on the lifter, which is in good consistent with the wear behavior measured by the experiment.

Collision Energy Analysis within the Vertical Shaft Impact Crusher Based on the Computational Fluid Dynamics-Discrete Element Method

“…The majority of this low-energy dissipation occurs as sound or heat. Hence, these collisions do not damage the particles. , …”

“…An increase in the rotational speed decreases the tangential low-energy collision frequency and increases the tangential high-energy collision frequency. This indicates that, with an increase in the rotational speed, a part of tangential low-energy collision transfers to tangential high-energy collision, leading to severe crusher wear and a more rounded-shaped product …”

“…To enhance the statistical analysis of energy distribution in the crushing chamber, the crushing chamber is partitioned into 80 × 80 × 1 grids utilizing the EDEM postprocessing function. Following the rotor being stabilized, the cumulative energy absorbed and dissipated by the particles throughout a single cycle of operation is computed the resulting data is visually represented using Matlab, 30 and the simulation results are shown in Figures 6−8 According to Figures 6−8, at the same feed rate, with an increase in the rotational speed, the energy distribution in the crushing chamber gradually becomes sparser while the energy dissipation is gradually increased. It is also observed that the collision within the rotor decreases gradually.…”

“…Hence, these collisions do not damage the particles. 29,30 The collision frequency of lower energy gradually decreases with an increase in rotational speed. In comparison, the collision frequency of higher energy gradually increases.…”

Study on the mechanical effect and wear behaviour of middle trough of a scraper conveyor based on DEM–MBD

“…They analysed the wear distribution on the lifter using DEM. 20 Yan et al used the coupled FEM–DEM to study the strong nonlinear friction fluctuation and gap dilatancy between two plates under different external-load, shear-velocity and elastic-modulus conditions. 21 In terms of transport equipment, Forsström and Jonsén established a simulation model of a dump truck using FEM–DEM and performed a rotating-drum test to calibrate the wear parameters and predict the absolute wear of the structure of a tipper body.…”