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Physical model of granule adhesion to the belt-electrodes of a tribo-aero-electrostatic separator
LI Jia 1 * #,Lucian Dascalescu 2,Mohamed Miloudi 2,Mihai Bilici 2,XU Zhenming 3
1.School of Environmental Science and Engineering, Shanhai Jiao Tong University, ShangHai 200240
2.P'Institute, UPR 3346, CNRS- University of Poitiers- ENSMA
3.School of Environmental Science and Engineering, Shanhai Jiao Tong University
*Correspondence author
#Submitted by
Subject:
Funding: Open Project of Key Laboratory of Solid Waste Treatment and Resource Recycle(No.09gk01), Shanghai Natural Science Foundation(No.10ZR1415900), Doctoral Fund of Ministry of Education of China(No.20090073120041), National Natural Science Foundation of China (No.51008192)
Opened online:17 January 2013
Accepted by: none
Citation: LI Jia,Lucian Dascalescu,Mohamed Miloudi.Physical model of granule adhesion to the belt-electrodes of a tribo-aero-electrostatic separator[OL]. [17 January 2013] http://en.paper.edu.cn/en_releasepaper/content/4508382
 
 
Recent studies have demonstrated the effectiveness of tribo-aero-electrostatic separation technologies, which consist in the selective sorting of mixed granular insulating materials 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 put the theoretical bases for the optimization of this process, i. e. maximize the total mass of the granules collected at the two electrodes that generate the electric field. The various forces that drive a granule of given mass and electric charge through the electric field and make it stick to an electrode are expressed as functions of the several input variables and parameters of the process, such as the applied high-voltage or the surface roughness, the size and the position of the electrodes. The concepts of "critical electrostatic field" and "virtual climbing distance" are introduced. The prediction of the theoretical model are confirmed by the results of three sets of experiments, carried out on samples of a granular mixture consisting of 50% Acrylonitrile Butadiene Styrene (ABS) and 50% High Impact Polystyrene (HIPS), originating from the recycling of waste electric and electronic equipment. Higher separation efficiency was obtained when the electric field in the active zone was intensified by the use of an additional electrode connected to the ground and when the collecting electrodes were covered by a thin insulating layer.
Keywords:Environmental Engineering; tribo-aero-electrostatic separator; waste plastic; recycling
 
 
 

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