Influence of Dielectric Barrier Discharge treatment on the triboelectric charging and the electrostatic separation of plastic particles
Résumé
Effective triboelectric charging is a prerequisite of the successful electrostatic separation of granular insulating materials. If the triboelectric effect imparted them high levels of charge of opposite polarities, the particles can be easily separated in a high-intensity electric field. The dielectric barrier discharge (DBD), commonly used for ozone production, air depollution or surface treatment is able to change the triboelectric properties of plastics. Depending on the conditions of DBD treatment (amplitude and frequency of the voltage applied to the electrode system, the duration of the exposure…) the triboelectric charge of plastics can be improved or decreased. The aim of this study is to compare the results of triboelectric charging and electrostatic separation of DBD-treated and untreated plastic particles originating from WEEE. Triboelectric series were established for nine different plastics (ABS, HIPS, PC, Cristal PC, PE, PP, PS, Cristal PS and PVC) using a rotating cylinder tribocharging device. The cylinder of the device was made of either High-Density Polyethylene (HDPE) or Polyvinyl Chloride (PVC). The separation experiments were carried out on a rolltype electrostatic separator. The effects of DBD on plastic particles charging were very significant. Most of the studied plastics got a negative tribocharge after having been treated by DBD, whereas five or six of them were positively charged without DBD treatment, depending on the type of the cylinder of the tribocharging device. The modification of the triboelectric behavior highly affects the electrostatic separation of the six different mixtures that were tested: PE-HIPS, PE-PP, PE-PVC, PP-HIPS, PP-PVC and PVC-HIPS.
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