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Electrostatic separation of HIPS/ABS and HIPS/ABS-PC plastic - PowerPoint PPT Presentation

Electrostatic separation of HIPS/ABS and HIPS/ABS-PC plastic mixtures from IT equipment using fluidized bed tribocharging L. Calin 1 , A. Catinean 1 , M. Bilici 1 , L. Dascalescu 2 , A. Samuila 1 1 Technical University of Cluj-Napoca/Romania 2


  1. Electrostatic separation of HIPS/ABS and HIPS/ABS-PC plastic mixtures from IT equipment using fluidized bed tribocharging L. Calin 1 , A. Catinean 1 , M. Bilici 1 , L. Dascalescu 2 , A. Samuila 1 1 Technical University of Cluj-Napoca/Romania 2 University of Poitiers/IUT Angouleme/France 1/1 1

  2. Introduction Plastic waste in EU 25.8·10 6 tons/year collected for recycling: less than 30 % Plastic from WEEE: • highly engineered different type of plastics • includes additives should not be mixed • bounded with complex products • more than one types of polymer 2/1 1

  3. Triboelectrostatic separation Separation of “plastic – plastic” mixtures • Tribocharging of the plastic mixture • Separation in high intensity electric field Tribocharging mechanisms of the plastic granules Free-fall triboelectrostatic Triboelectric series 3/11 separator

  4. Fluidized bed tribocharging device Tribocharging process • The granular material is maintained in fmuidized bed by the action of the vertical air fmow • Granules get charge by repeated collisions with each other • Granules of difgerent material acquire charge of opposite polarity Principle of the fmuidized (triboelectric series) bed 4/11 • Charged granules are fed tribocharging device

  5. Materials Engineering plastics Size distribution and appearance in WEEE (IT waste) for the three samples used in the triboelectrostatic separation experiments The market value of the recycled ABS, HIPS and ABS-PC is much higher if they are separated from each other 5/11

  6. Experimental setup and Method Triboelectrost atic separation method - the sample is maintained in the tribocharging device for a set amount of time - the components of the granular mixture acquire charge of opposite polarity - the charged Experimental set-up with fluidized bed tribocharging granules are fed in device and free-fall electrostatic separator the free fall 6/11

  7. Preliminary experiments • Choosing the material of the tribocharging chamber • Setting the optimal tribocharging time The granules charge increases Better triboelectrification is obtained non-linearly with the if the chamber’s walls give the tribocharging time and presents a granules the same charge polarity saturation tendency as by collision with granules of the other component Charge polarity of the granules Tribocharg ing chamber ABS ABS-PC HIPS material (black) (green) (white) AL negative negative negative PET positive positive negative PP positive positive positive 7/11

  8. Results and discussion Separation of balanced (50% - 50%) HIPS/ABS-PC mixture Material distribution in the Flow sheet diagram of the single step collecting boxes and appearance triboelectrostatic separation experiment 8/11

  9. Results and discussion Separation of a heavily unbalanced mixture (90% - 10%) HIPS/ABS-PC Material distribution Flow sheet diagram of the two step in the collecting boxes triboelectrostatic separation 9/11

  10. Results and discussion Separation of a heavily unbalanced mixture (10% - 90%) HIPS/ABS Flow sheet diagram of the Material distribution triboelectrostatic separation experiment in the collecting boxes 10/1 1

  11. Conclusions  The experimental results confirm the feasibility of the separation of HIPS, ABS-PC, and ABS originated from IT waste in the free-fall electrostatic separator, with prior tribocharging in a fluidized bed device  The highest recovery rates and purities were obtained for balanced mixtures  In the case of heavily unbalanced mixtures high recovery rate and purity close to 100% were obtained for the majority material concentrate, while the minority material concentrate has high recovery rate but lower purity  A second triboelectrostatic separation of the minority material concentrate improves significantly the quality of the separation products 11/1 1

  12. Thank you very much ! Adrian.Samuila@ethm.utcluj.ro laurflorentincalin@yahoo.com

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