Triboelectrostatic separation of brominated flame retardants polymers from mixed granular wastes
Résumé
The general purpose of the present paper is to study the feasibility of removing brominated flame retardants (BFR) polymers from mixed granular wastes using tribo-electrostatic separation. The study was carried out on mixtures consisting in equal quantities of high impact polystyrene (HIPS) particles either BFR-free or containing 40000 ppm of brome (4.7%). Three triboelectric charging devices were used: a vibrating tribocharger (a container made of stainless steel, polystyrene or polypropylene and fixed on a vibrating table); a rotating cylinder tribocharger made of polyvinyl chloride; a fluidized bed tribocharger, the walls of which were made of poly methyl methacrylate. The selective sorting of the granular mixture was performed using a roll type electrostatic separator. The results confirm that separating BFR HIPS from BFR-free HIPS is feasible. Best separation results were obtained for the mixture tribocharged in the fluidized bed tribocharger.
Mots clés
triboelectrostatic separation
brominated flame retardants polymers
high impact polystyrene particles
triboelectric charging devices
vibrating tribocharger
container
rotating cylinder tribocharger
fluidized bed tribocharger
mixed granular waste
stainless steel
polypropylene
polyvinyl chloride
poly methyl methacrylate
sorting process