Particle Behavior and Aperture Optimization of Variable Vibration-Amplitude Screening Based on Discrete Element...

Area of Science:

• Mechanical Engineering
• Particle Technology
• Separation Science

Background:

• Novel screening technologies are emerging from particle-scale studies.
• The variable amplitude equal thickness vibration screen (VAETVS) is one such innovation.
• Optimizing VAETVS performance is crucial for efficient material separation.

Purpose of the Study:

• To investigate the optimization of VAETVS using varied aperture sizes.
• To analyze particle dynamics and spatial distribution under different screen configurations.
• To develop a predictive model for screening efficiency based on aperture variations.

Main Methods:

• Utilizing the discrete element method (DEM) for simulations.
• Varying aperture sizes across three distinct screen panels.
• Analyzing particle mass distribution and screening efficiency.
• Applying the Box-Behnken response surface method for modeling.

Main Results:

• VAETVS can be optimized using varied amplitudes and aperture sizes.
• Amplitude variance is particularly effective for hard sieve and hindrance particles.
• A significant increase in the difference of coarse and fine particle mass distribution was observed from feed to discharge end.
• Increasing aperture sizes generally enhances this particle mass difference.

Conclusions:

• Variable aperture sizes offer an effective optimization strategy for VAETVS.
• A mathematical model was developed to predict screening efficiency.
• Optimal aperture sizes and opening areas were identified for maximum screening efficiency (86.35% and 87.82% respectively).