Experimental study of the effect of ambient air humidity on the efficiency of tribo-aero-electrostatic separation of mixed granular solids

M. Miloudi, M. Remadnia, C. Dragan, K. Medles, A. Tilmatine, L. Dascalescu
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引用次数: 3

Abstract

Mixed granular insulating materials can be electro-statically separated by tribocharging them in a fluidized bed affected by an electric field orthogonally oriented to the direction of the fluidization air. The aim of the present paper is to evaluate the effect of ambient air humidity on the outcome of this tribo-aero-electrostatic separation process, i.e. the mass of the granules collected at the two electrodes that generate the electric field. The mixture to be separated was composed of Acrylonitrile Butadiene Styrene (ABS) and High Impact Polystyrene (HIPS) originating from the recycling of waste electric and electronic equipment. A set of experiments carried out for two durations (30 s and 60 s), at two values of ambient relative humidity (RH = 20% and RH = 40%), pointed out that the separation becomes efficient beyond a certain value of the initial mass of the mixtures. The experimental design methodology and commercial software MODDE 5.0 were then employed for investigating the effects of two process variables: the speed of the metallic conveyors that serve as high-voltage electrodes, and the humidity of ambient air. The effectiveness of separation was found to depend significantly on the latter factor. Surface potential decay measurements performed on charged layers of the two sorts of particles facilitate the interpretation of separation results: at higher RH, the hydrophilic ABS granules loose faster their charge when in contact with a grounded plate. As a consequence, they are in less number than the HIPS granules to be collected at the exit of the tribo-aero-electrostatic separation chamber.
环境空气湿度对混合颗粒固体摩擦-空气-静电分离效率影响的实验研究
混合颗粒状绝缘材料可以在与流化气流方向正交的电场作用下,在流化床中进行摩擦充电,从而实现静电分离。本文的目的是评估环境空气湿度对这种摩擦-空气-静电分离过程结果的影响,即在产生电场的两个电极处收集的颗粒的质量。待分离的混合物由丙烯腈-丁二烯-苯乙烯(ABS)和高冲击聚苯乙烯(HIPS)组成,这些聚苯乙烯来源于废旧电器和电子设备的回收。在两种环境相对湿度值(RH = 20%和RH = 40%)下进行的两组持续时间(30 s和60 s)的实验表明,在混合物的初始质量超过一定值时,分离是有效的。然后采用实验设计方法和商业软件MODDE 5.0来研究两个过程变量的影响:作为高压电极的金属输送机的速度和环境空气的湿度。发现分离的有效性在很大程度上取决于后一个因素。在两种颗粒的带电层上进行的表面电位衰减测量有助于对分离结果的解释:在较高的相对湿度下,亲水性ABS颗粒与接地板接触时,其电荷松散得更快。因此,它们的数量少于在摩擦-空气-静电分离室出口收集的HIPS颗粒。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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