Motion behavior of grinding balls plays a vital role in improving efficiency of particle crushing. A method of preparing micro-particles by changing ball-motion behavior in a flutter mill is proposed and multiple grinding experiments are conducted. Crushing performance parameters, such as breakage rate Si, production rates of fine particles Fiand Fi*, are studied in different motion conditions. From the results, a better crushing performance is attained in the coupled motion modes of rotating speed ratio of 85%, with a vibrating amplitude of 8 mm and a frequency of 12 Hz. In addition, the influence of ball-motion behavior on particle crushing performance is discussed. The ball-motion behaviors, such as the collision energy loss E, among grinding balls have some relationship with the particle crushing performance of Si. Therefore, this study not just provides an efficiency way of accumulating micro-particles, but also reveals how the ball-motion behavior influence particle crushing performance in the flutter mill.
LIANG Man, SUN Weihong, SUN Yi, SHAN Jihong. Influence of Grinding Ball-Motion Behavior on Particle Crushing Performance and a Way of Micro-particle Preparation in a Flutter Ball Mill[J]. Transactions of Nanjing University of Aeronautics & Astronautics,2021,38(3):450-461
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History
Manuscript received: March 10,2020
Manuscript revised: July 10,2020
Adopted:
Online Published: June 25,2021
Published:
表 4 Table 4 Orthogonal test table
表 2 Table 2 Chemical composition of the used silica sand
图1 A schematic diagram of a flutter ball mill[17]Fig.1
图2 Experimental set-up of the flutter ball millFig.2
图3 Testing results for the experimental set-up with the vibrating amplitude of 4 mmFig.3
图4 Simulation model and the motion-path of the cylinderFig.4
图5 Fine particle-size distribution in different motion conditionsFig.5
图6 Variation of F325 of particles with a size finer than 325 meshFig.6
图7 Variation of F650 of particles with a size finer than 650 meshFig.7
图8 Variation of F1 600 of particles with a size finer than 1 600 meshFig.8
图9 Comparison of F325, F650, and F1 600 in all groupsFig.9
图10 Values of Fi* in the flutter-motion conditionsFig.10
图11 First-order grinding dynamic plots for ten groupsFig.11
图12 Variation of particle breakage rate S1 in ten groupsFig.12
图13 Viscous damping in a linear contact model[38]Fig.13
图14 Mean contact force in ten groupsFig.14
图15 Collision energy loss among balls in ten groupsFig.15
图16 Linear dependence of Si to EFig.16
表 3 Table 3 Simulation parameters in EDEM model
表 5 Table 5 RRB liner regression results for the ground particles
LIANG Man, SUN Weihong, SUN Yi, SHAN Jihong. Influence of Grinding Ball-Motion Behavior on Particle Crushing Performance and a Way of Micro-particle Preparation in a Flutter Ball Mill[J]. Transactions of Nanjing University of Aeronautics & Astronautics,2021,38(3):450-461
LIANG Man, SUN Weihong, SUN Yi, SHAN Jihong. Influence of Grinding Ball-Motion Behavior on Particle Crushing Performance and a Way of Micro-particle Preparation in a Flutter Ball Mill[J]. Transactions of Nanjing University of Aeronautics & Astronautics,2021,38(3):450-461
LIANG Man, SUN Weihong, SUN Yi, SHAN Jihong. Influence of Grinding Ball-Motion Behavior on Particle Crushing Performance and a Way of Micro-particle Preparation in a Flutter Ball Mill[J]. Transactions of Nanjing University of Aeronautics & Astronautics,2021,38(3):450-461
LIANG Man, SUN Weihong, SUN Yi, SHAN Jihong. Influence of Grinding Ball-Motion Behavior on Particle Crushing Performance and a Way of Micro-particle Preparation in a Flutter Ball Mill[J]. Transactions of Nanjing University of Aeronautics & Astronautics,2021,38(3):450-461
LIANG Man, SUN Weihong, SUN Yi, SHAN Jihong. Influence of Grinding Ball-Motion Behavior on Particle Crushing Performance and a Way of Micro-particle Preparation in a Flutter Ball Mill[J]. Transactions of Nanjing University of Aeronautics & Astronautics,2021,38(3):450-461
LIANG Man, SUN Weihong, SUN Yi, SHAN Jihong. Influence of Grinding Ball-Motion Behavior on Particle Crushing Performance and a Way of Micro-particle Preparation in a Flutter Ball Mill[J]. Transactions of Nanjing University of Aeronautics & Astronautics,2021,38(3):450-461
LIANG Man, SUN Weihong, SUN Yi, SHAN Jihong. Influence of Grinding Ball-Motion Behavior on Particle Crushing Performance and a Way of Micro-particle Preparation in a Flutter Ball Mill[J]. Transactions of Nanjing University of Aeronautics & Astronautics,2021,38(3):450-461
LIANG Man, SUN Weihong, SUN Yi, SHAN Jihong. Influence of Grinding Ball-Motion Behavior on Particle Crushing Performance and a Way of Micro-particle Preparation in a Flutter Ball Mill[J]. Transactions of Nanjing University of Aeronautics & Astronautics,2021,38(3):450-461