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Triboelectrostatic Separation of Mixed Three Kinds of Plastics by a Two-stage Separation Process  

Park, Chul-Hyun (Korea Institute of Geoscience and Mineral Resources)
Jeon, Ho-Seok (Korea Institute of Geoscience and Mineral Resources)
Baek, Sang-Ho (Korea Institute of Geoscience and Mineral Resources)
Park, Jai-Koo (Hanyang University, Department of Geoenvironmental System Engineering)
Publication Information
Resources Recycling / v.16, no.5, 2007 , pp. 57-64 More about this Journal
Abstract
Triboelectrostatic separation of mixed three kinds of plastics, PVC, PET and PMMA, in the range of similar gravity has been performed through a two-stage separation process. Polypropylene (PP) and high-impact polystyrene (HIPS) were found to be the most effective materials for a tribo-charger in the separation of PVC, PET and PMMA. In the 1st stage using the PP cyclone charger, PVC grade and recovery depended considerably on the air velocity (10 m/s), the relative humidity (<30%), the electric field (>200 kV/m) and the splitter position (+2 cm from the center) in the triboelelctrostatic separator unit. At an optimum condition a PVC grade of 99.6% and a recovery of 97.5% was achieved. In the 2nd stage using the HIPS cyclone charger, a PMMA grade of 98.3% and a recovery of 97.0% was obtained under the conditions of 10m/s air velocity, over 250 kV/m electric field, central splitter position and less than 40% relative humidity.
Keywords
waste; material separation; waste plastics; tribe-charging; electrostatic;
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Times Cited By KSCI : 2  (Citation Analysis)
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