Selective Separation of Post-consumed Plastics (PET&PVC) by Flotation Method
Currently,recycling technologies use relatively homogeneous plastics because hand-sorting waste feed is too expensive.Many promising technologies for separating mixed thermoplastics are being investigated,but they are still uneconomical and unreliable.Burning plastics for recycling is not used because of poisonous gases released when their burning.PET and PVC cannot be separated using conventional gravity separation techniques because their specific gravities overlap;PET density changes from 1.33 g/cc to 1.37 g/cc and PVC density is between 1.32 g/cc and 1.37 g/cc.For this reason,plastic recycling needs new techniques.Among these techniques froth flotation,also used in mineral processing,can be useful for its cost and simplicity.In this method,a plastic is selected from mixture,tried to regain its natural property,hydrophobicity.In this study the experiments were applied by using plasticizer reagents to make the selected plastics hydrophobic and using NaOH to render the other hydrophilic.Post-consumed PET and PVC are evaluated by concerning the effects of selected parameters (particle size,concentration of plasticizer reagent,amount of NaOH,conditioning time and the effect of conditioning temperature).At the end of the experiments,optimum parameters for selective flotation of PET from PVC was found as particle size of -4.76 + 3.36 mm,NaOH amount of 30 kg/t,conditioning temperature of 75℃,conditioning time of 30 minutes,reagent amount of 300 mg/L.Consequently,PET was recovered with 99.7% purity and 57% efficiency.
PET PVC Flotation Plasticizer Hydrophobicity
A.G(u)ney T.Saracoglu F.Burat M.O.Kangal
Istanbul Technical University,Mineral Processing Department,Istanbul,Turkey
国际会议
XXIV International Mineral Processing Congress(第24届国际矿物加工大会)
北京
英文
3670-3676
2008-09-24（万方平台首次上网日期，不代表论文的发表时间）