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

2019 ◽  
Vol 234 (7) ◽  
pp. 1061-1074
Author(s):  
Zixin Yin ◽  
Yuxing Peng ◽  
Tongqing Li ◽  
Zhencai Zhu ◽  
Zhangfa Yu ◽  
...  
Keyword(s):  
Wear Rate ◽  
Ball Mill ◽  
Wear Behavior ◽  
Operating Parameter ◽  
Experimental Results ◽  
Ball Mills ◽  
Dem Simulation ◽  
Wear Process ◽  
Grinding Media ◽  
Mill Speed

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.

Experimental study of charge dynamics in a laboratory-scale ball mill

2017 ◽  
Vol 232 (19) ◽  
pp. 3491-3499 ◽  
Author(s):  
Zixin Yin ◽  
Yuxing Peng ◽  
Zhencai Zhu ◽  
Zhangfa Yu ◽  
Tongqing Li ◽  
...  
Keyword(s):  
Moisture Content ◽  
Ball Mill ◽  
Laboratory Scale ◽  
Experimental Results ◽  
Content Increase ◽  
Mass Ratio ◽  
Charge Dynamics ◽  
Grinding Media ◽  
Mill Speed ◽  
Trajectory Simulations

To understand and describe the behavior of charge dynamics in mills, a series of dry and wet grinding tests were performed on a laboratory-scale ball mill. The comparisons between experimental results and grinding media trajectory simulations were addressed. Results show that the grinding media trajectory simulations exhibit a good agreement with the experimental results. The shoulder angle was proportional to mill speed and ball filling. The toe angle was inversely proportional to ball filling, but the impact point angle was appeared to invariant to ball filling and inversely proportional to mill speed. By means of motion analysis of the charge, a good grinding efficiency can be obtained when the ball filling ranging from 20% to 40% and the mill speed ranging from 70% to 80%. For dry tests, the orthogonal analysis indicates that the influence order of four factors on power-mass ratio is ball filling, mill speed, powder-grinding media ratio and lifter profile and the influence order of four factors on −0.074 mm yield is mill speed, ball filling, powder-grinding media ratio and lifter profile. The best dry tests are a combination of 70% of critical speed, 20% of ball filling, 0.8 of powder-grinding media ratio and waveform lifter. Correspondingly, the power-mass ratio can increase by 28.27% and the production of −0.074 mm can increase by 50.38%. For wet tests, the variations of −0.074 mm yield on mill speed and moisture content increase up to a maximum and then decrease rapidly. The −0.074 mm yield can reach a maximum at the 80% of mill speed and 50% of moisture content.

scholarly journals Electromechanical Dynamic Behaviour and Start-Up Evaluation of Tumbling Ball Mills

2018 ◽  
Vol 2018 ◽  
pp. 1-13
Author(s):  
Weidong Lv ◽  
Guoqiang Wang ◽  
He Tian
Keyword(s):  
Dynamic Model ◽  
Ball Mill ◽  
Electromechanical Coupling ◽  
Coupling Model ◽  
Angular Speed ◽  
Experimental Results ◽  
Ball Mills ◽  
Start Up ◽  
Dynamic Simulator ◽  
Simulation Results

This paper presents a dynamic simulator of the electromechanical coupling start-up of a ball mill. The electromechanical coupling model based on the dynamic model of the ball mill, the characteristic equation of the clutch, and the dynamic model of the induction motor is established. Comparison between the simulation results of angular speed, load torque and current obtained from the model, and the experimental results is conducted to validate the correctness of these simulation results. Results show that the simulation results of the electromechanical model are highly consistent with the experimental results. Two indexes are proposed for evaluation. Finally, a 4500 kW ball mill is used to analyse the start-up process with different operation parameters of the air clutch. The effect of the engagement time and the pressure of the air clutch on the torque, current, and shock extent is analysed. Moreover, the optimum inflation time is determined.

scholarly journals Optimization of Wear Process Parameters on 17-Cr Ferritic ODS Steel

2019 ◽  
Vol 9 (2) ◽  
pp. 1828-1836
Keyword(s):  
Wear Rate ◽  
Process Parameters ◽  
Wear Behavior ◽  
Oxide Dispersion Strengthened ◽  
Oxide Dispersion ◽  
Sliding Velocity ◽  
Oxide Dispersion Strengthened Steel ◽  
Wear Process ◽  
Ods Steel ◽  
Sliding Distance

The main aim of this article deals with the wear behavior of mechanically alloyed 17-Cr oxide dispersion strengthened (ODS) Ferritic steel consolidated through Vacuum Hot Pressing (VHP) at temperature level of 1170 °C under pressure level of 60 MPa with 60 minutes as holding time and with rate of cooling of 50 ˚C /min and a vacuum level of 10-3 torr. The persuade of wear process parameters were investigated based on the load applied, sliding velocity and sliding distance at a temperature of 350°C on dry sliding track of 17-Cr Ferritic oxide dispersion strengthened steel (Fe-17Cr-0.35Y2O3 -1.5ZrO2 -4Al (%wt). Wear test was conducted in a dry atmosphere using a pinon-disc wear testing machine. Wear behavior of 17-Cr Ferritic ODS steel was analyzed by using Taguchi approach. To examine the process parameter during high temperature wear rate analysis of variance and signal to noise ratios were used. During the wear analysis sliding distance was found to be influential parameters of wear rate for 17-Cr Ferritic oxide dispersion strengthened steel succeeded by functional load and sliding velocity. The regression model was found to calculate the rate of wear for 17-Cr Ferritic oxide dispersion strengthened steel.

scholarly journals Study on heat transfer behavior and thermal breakage characteristic of the charge in ball mills

2021 ◽  
Vol 13 (3) ◽  
pp. 168781402199496
Author(s):  
Tongqing Li ◽  
Zixin Yin ◽  
Guiyi Wu
Keyword(s):  
Heat Transfer ◽  
Ball Mill ◽  
Iron Ore ◽  
Heating Temperature ◽  
Temperature Fields ◽  
Ball Mills ◽  
Optimal Feed ◽  
Underlying Mechanisms ◽  
Mill Speed ◽  
Charge Temperature

Ball mill is the widely used comminution device for the size reduction of iron ore particles, yet the underlying mechanisms of heat transfer and thermal breakage inside the mills heretofore are not deeply understood. Therefore, the Discrete element method was carried out to study the effect of operating parameters on charge temperature, and the batch grinding experiments of iron ores were conducted to verify the heating temperatures using a laboratory ball mill. Results show that increasing mill speed will result in the charge temperature increasing initially and then decreasing. The temperature fields of the charge and load behavior remain approximately the same for the different ball filling. The main findings of this study are that the heating temperature can contribute to enhancing the breakage behavior of iron ore particles, and correspondingly the optimal feed sizes for different heating temperatures are determined to be 2.48 mm, 2.63 mm, 2.78 mm, and 3.59 mm, respectively.

scholarly journals Analysis of Wear-Resistant Surface with Pangolin Scale Morphology by DEM Simulation

2020 ◽  
Vol 10 (8) ◽  
pp. 2896
Author(s):  
Rui Zhang ◽  
Haibin Yu ◽  
Hao Pang ◽  
Guangming Chen ◽  
Weihsun Tai
Keyword(s):  
Wear Rate ◽  
Abrasive Wear ◽  
Wear Behavior ◽  
Scale Model ◽  
Geometrical Shape ◽  
Displacement Fields ◽  
Dem Simulation ◽  
Wear Rates ◽  
Scale Models ◽  
Pangolin Scale

Based on the Discrete Element Method (DEM), an abrasive wear system composed of pangolin scale models and abrasive sand was established. The wear morphology of pangolin scale models under different velocities were simulated by PFC2D®. Their wear behaviors were discussed with regard to the contact bond fields, the contact force chains, the velocity fields and the displacement fields of the abrasive wear system. Moreover, the resistance of the pangolin scale models under different velocities were analyzed. In the DEM simulation, the fracture and debris locomotion on the scale model were observed at a meso-microscopic scale. The results show that the geometrical shape of the pangolin scale is helpful for decreasing the boundary stress, with the wear rate decreasing when the velocity is higher than 0.62 m·s−1. The wear rate is no more than 0.006 g/m under the abrasive sand, with a radius of 0.11–0.20 mm. The wear rates of the pangolin scale model agree with the experimental results, and the DEM provides a new way to study the abrasive wear behavior of this non-smooth biological surface.

The Effect of Graphite Content on the Wear Behavior of Ni/WC/G Composite Coating

2015 ◽  
Vol 1120-1121 ◽  
pp. 702-706
Author(s):  
Gui Rong Yang ◽  
Chao Peng Huang ◽  
Wen Ming Song ◽  
Ying Ma ◽  
Yuan Hao
Keyword(s):  
Friction Coefficient ◽  
Wear Rate ◽  
Composite Coating ◽  
Wear Behavior ◽  
Wear Loss ◽  
Graphite Content ◽  
Wear Process ◽  
Changing Trend ◽  
Main Support ◽  
Worn Surface

The Ni/WC/G composite coating was fabricated through vacuum cladding. The effect of graphite content on the wear behavior was investigated, and the worn surface was observed through scanning electron microscopy (SEM). The friction coefficient decreased with the increasing graphite content until the graphite content was 6%, and then increased when the graphite content was 8%. The wear rate decreased with the increasing graphite content for all graphite content. The wear loss of GCr15plate decreased with the increasing graphite content until the graphite content was 6%, and the wear loss of plate was rising when graphite was 8%. There was a layer composed of wear debris that containing oxides and graphite. The covering area increased with the increasing graphite content, which agreed with the changing trend of friction coefficient and wear rate. The net texture-like structure was formed among the composite coating, which could be the main support for load during wear process. There was little single WC particle protruding for support the wear load. Therefore, the Ni-based substrate was not easily to be worn.

scholarly journals On Some Mechanical Properties and Wear Behavior of Sintered Bronze Based Composites Reinforced with Some Aluminides Microadditives

2017 ◽  
Vol 22 (2) ◽  
pp. 293-302 ◽  
Author(s):  
E. Feldshtein ◽  
P. Kiełek ◽  
T. Kiełek ◽  
L. Dyachkova ◽  
A. Letsko
Keyword(s):  
Mechanical Properties ◽  
Flexural Strength ◽  
Wear Rate ◽  
Contact Surface ◽  
Wear Behavior ◽  
Wear Process ◽  
Principal Reason ◽  
Sintered Bronze

AbstractIn the paper, the changes in some mechanical properties and wear behavior of CuSn10 sintered bronze and MMCs based on this bronze reinforced with composite ultrafine aluminide powders FeAl/15 % Al2O3, NiAl/15 % Al2O3and Ti-46Al-8Cr are described. It was observed that the presence of aluminides in the MMCs leads to an increase in the hardness, but the flexural strength may increase or decrease depending on the type of aluminide. The presence of aluminides in the MMC reduces the wear rate considerably. It is decreased in the direction of FeAl/15 % Al2O3→ NiAl/15 % Al2O3→ Ti-46Al-8Cr aluminides and for the best MMC composition the advantage is about 20 times. In the MMCs wear process, micro-craters are formed on the contact surface and it is the principal reason of a decrease in the wear rate.

Analysis of Mill Performance of Industrial Scale Ball Mill Using DEM Simulation

2013 ◽  
Vol 634-638 ◽  
pp. 3732-3736
Author(s):  
Hong Cheng Li ◽  
Wei Min Dong ◽  
Xing Ping Xie
Keyword(s):  
Discrete Element Method ◽  
Ball Mill ◽  
Reference Value ◽  
Empirical Models ◽  
Industrial Scale ◽  
Grinding Process ◽  
Ball Mills ◽  
Dem Simulation ◽  
Parameter Values ◽  
Selection Of

The simulation of grinding process of an industrial scale ball mill was carried out using the discrete element method (DEM). Combining the information from DEM simulation and theoretical or empirical models, the related parameter values of mill performance are obtained, which have some reference value to the design, optimization and selection of ball mills.

The effect of fiber orientation on wear behavior of glass fiber-epoxy filled with particles

2018 ◽  
Vol 70 (8) ◽  
pp. 1552-1559 ◽  
Author(s):  
Ragab K. Abdel-Magied ◽  
Mohamed F. Aly ◽  
Heba I. Elkhouly
Keyword(s):  
Wear Rate ◽  
Glass Fiber ◽  
Fiber Orientation ◽  
Wear Behavior ◽  
Normal Load ◽  
Experimental Tests ◽  
Experimental Results ◽  
Specimen Preparation ◽  
Effective Parameters ◽  
Content Type

Purpose The fiber orientation is considered one of the important parameters that have an effect on the characteristics of composites. This paper aims to investigate the effect of fiber orientation on the abrasive wear of the glass-epoxy (G-E) composites with different silicon carbide (SiC) filler weights (Wt.%). Design/methodology/approach The wear rate of glass fiber reinforced with angle-ply 0º, ±45º and 90º is discussed. The G-E composites with different weights of SiC filler at angle ±45º are considered. Hand lay-up technique was adopted for specimen preparation. The influence of effective parameters such as filler Wt. %, normal load, abrasive size and abrading distance on the wear rate was presented and discussed. Findings Experimental tests including pin on disk, micro-hardness and scanning electron microscope were carried out to investigate the composite characteristics. Originality/value The experimental results showed that the resistance wear was superior in case of ±45º fiber orientations. A validation of the experimental results using Taguchi approach to verify the optimal wear rate parameters was presented.

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