Kinematic characteristics of key structures and time evolution law of material distribution characteristics during flip-flow screening

Abstract

Screening is widely used in classification, dehydration and desliming operations of mineral processing. Flip-flow screening is an important method for classifying fine materials. Here, the flip-flow screening method with high-frequency excitation is proposed, and a flip-flow screen prototype based on displacement excitation is fabricated. First, the kinematic characteristics of the moving end and screen plate are obtained using the vibration test system. The reliability and stability of the equipment are also verified. The time evolution law of the screened product distribution characteristics is elucidated through screening experiments. With an increase in screening time, the yield of the undersize products decreased gradually, and the weighted average particle size became closer to the specified screening particle size. Furthermore, the evolution of the screening effect with time under different excitation frequencies is explored. As screening time increases, the screening efficiency increases and the total misplaced materials decreases. When the frequency reached 16.5 Hz, the minimum content of total misplaced materials is 4.68% and the optimum screening efficiency is 89.55%.