A Numerical Study of Separation Performance of Vibrating Flip-Flow Screens for Cohesive Particles

Vibrating flip-flow screens (VFFS) are widely used to separate high-viscosity and fine materials. The most remarkable characteristic is that the vibration intensity of screen frame only 2–3 g (g represents gravitational acceleration), while surface can reach 30–50 g. This effectively solves problem blocking aperture in screening process moist particles. In this paper, approximate state motion sieve mat realized by setting discrete rigid at multiple points on elastic VFFS. effects energy levels between particles separated via performance were compared analyzed. results show flow characteristics have a great influence separation performance. For 8 mm particle screening, particle’s velocity dominates its movement behavior range 0–8 J/m2 energy. feeding end region (Sections 1 2), with increase energy, decreases, contact time increases, so passage increases. When level continues increase, agglomerate together due effect cohesive force, agglomeration greater than velocity. Due particles, difficulty passing through yields various size fractions decrease some extent. transporting process, agglomerated need travel certain distance before depolymerization, stronger adhesive force larger depolymerization distance. Therefore, for case higher percentage near discharging 3 4) greater. above research helpful better understand optimize