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- Title
Tribo-charging and electrostatic separation of vehicle polymer particles using a new type of fluidized bed.
- Authors
Zhang, Hongshen; Gao, Xiang; Xu, Shengqi
- Abstract
High value-added reuse of waste vehicle polymers can effectively alleviate the global resource shortage and environmental degradation. How to separate mixed polymers cleanly and efficiently is an important prerequisite for their reuse. In the paper, polyamide (PA)/ polypropylene (PP)/acrylonitrile-butadiene-styrene (ABS) and polyethylene (PE)/PP/polyvinylchloride (PVC) of vehicle polymer mixed particles are taken as the research objects, and the tribo-electrostatic separation of three-component mixed particles is studied using the designed double-stage device for tribo-aero-electrostatic separation. First, the optimal installation angle of the fluidized bed reflow plate is determined to be 45° by using the coupling method of computational fluid dynamics and discrete element. Second, the gas velocity for forming a fast bed and the optimal charging time for two sets of mixed particles are identified by tribo-charging experiments. The separation voltage for the two sets of mixed particles is also determined using COMSOL software. Furthermore, based on the determined parameters, two sets of tribo-electrostatic separation experiments are carried out. Results showed that the purities of PA and ABS particles are more than 91%, the purities of the PE, PP (white), and PVC particles are more than 85%. The research provides a reference for the two-stage tribo-electrostatic separation of vehicle polymer mixed particles.
- Subjects
ELECTROSTATIC separation; POLYMER fractionation; COMPUTATIONAL fluid dynamics; ACRYLONITRILE butadiene styrene resins; WASTE recycling; ENVIRONMENTAL degradation; POLYMERS
- Publication
Process Safety & Environmental Protection: Transactions of the Institution of Chemical Engineers Part B, 2023, Vol 178, p331
- ISSN
0957-5820
- Publication type
Article
- DOI
10.1016/j.psep.2023.08.038