Abstract:

The charge of polymer particles for vehicles in a friction barrel?type tribicharger was explored preliminarily， and the friction charge sequences of six types of vehicle polymer particles including polypropylene （PP）， polyurethane （PU）， polyamide （PA）， polyethylene （PE）， polyvinyl chloride （PVC）， and acrylonitrile?butadiene?styrene （ABS） were investigated using a friction barrel?type tribicharger based on the Faraday cage. The charge laws were verified by taking ABS and PA as examples under different rotational speeds （n） and charge time （t） with the friction barrel?type tribicharger， and the optimal electrostatic separation parameters of ABS and PA were determined. The results indicated that the charge of polymer particles was proportional to n and t. The friction charge sequence of polymer particles for vehicles was as follows： （-） PE→ABS→PVC→PU→polymethyl methacrylate→PP→PA （+）. The optimal separation parameters of ABS and PA were determined to be n=20 r/min and t=1 min. Under this condition， the separation purity of ABS and PA reached 94.18 % and 99.86 %， respectively. The recovery rates of ABS and PA were 88.4 % and 75.3 %， respectively. This resulted in a total recovery rate of 90.15 %.

Key words: electrostatic separation, friction barrel?type tribicharger, vehicle polymer, triboelectric charging sequence