Abstract

The impacts of the plastic particles on the vertical electrodes of the free-fall tribo-electrostatic separator (FFTES) is one of the main drawbacks of this separator for sorting millimeter-size particles. The impact on the electrode causes in general a strong reflection of the particles causing the decrease of the separation purity because the particles impacting with the electrode are ejected further toward the compartment of the other material. This paper is aimed to investigate a modified FFTES configuration with rotating cylindrical electrodes instead of flat vertical electrodes to overcome the particle impacting effect. An experimental and a numerical analysis were carried out in which the main significant factors were investigated. The experiments carried out using binary mixtures of mm-size particles showed that the rotating electrodes attenuates considerably the reflection velocity in the horizontal plane causing a significant increase of the separator performance in terms of purity and recovery rates.

摘要

塑料颗粒对自由落体摩擦静电分离器 (FFTES) 垂直电极的影响是这种分离器用于分选毫米级颗粒的主要缺点之一。对电极的撞击通常会导致颗粒的强烈反射，从而导致分离纯度的降低，因为与电极撞击的颗粒被进一步喷向其他材料的隔室。本文旨在研究一种改进的 FFTES 配置，使用旋转圆柱形电极代替扁平垂直电极，以克服粒子撞击效应。进行了实验和数值分析，其中研究了主要的重要因素。