표제지
목차
ABSTRACT 11
제1장 서론 13
제1절 연구배경 13
제2절 마찰하전을 이용한 분리기술의 역사 15
제3절 국내외 플라스틱 재질분리 현황 16
제2장 이론적 배경 19
제1절 정전선별 19
1. 코로나 방전형 22
2. 정전유도형 23
3. 마찰하전형 23
제2절 마찰하전형 정전선별 25
1. 마찰하전형 정전선별의 원리 25
2. 마찰하전 메커니즘 27
3. 전기장 내에서 입자의 거동 30
4. 플라스틱의 대전서열 37
5. 마찰하전 방식 38
6. 하전 및 분리 효율에 영향을 미치는 인자 42
제3장 시료 및 실험방법 43
제1절 시료 및 실험장치 43
1. 시료의 특성 43
2. 실험장치 44
제2절 실험방법 47
1. 마찰하전 특성 연구 47
2. 재질분리 연구 49
제4장 실험결과 및 고찰 51
제1절 마찰하전 특성 연구 51
1. Work function 값 도출 51
2. 하전물질 선정 실험 53
3. 체류시간과 단일·혼합시료에 따른 하전량 54
4. 회전속도에 따른 하전량 54
5. 상대습도에 따른 하전량 55
제2절 재질분리 연구 55
1. 전압세기의 영향 55
2. 공기속도의 영향 61
3. 분리대 위치의 영향 62
4. 상대습도의 영향 62
5. PBT 제거율과 ABS 회수율의 관계 63
제5장 결론 71
참고문헌 73
감사의 글 76
Table 1. Kinds and application of electrostatic separator. 21
Table 2. Comparison of four published triboelectric series. 38
Table 3. Work function of plastics. 52
Fig. 1. Kinds and principle of electrostatic separations. 20
Fig. 2. Principle and schematic of corona electrostatic separation. 24
Fig. 3. Principle and schematic of induction eletrostatic separation. 24
Fig. 4. Principle and schematic of triboelectrostatic separation. 25
Fig. 5. Charging principle of particles by collision. 26
Fig. 6. Schematic representation of triboelectrostatic separation. 26
Fig. 7. Contact charge between two metals, A and B: (a) before contact, (b) after contact. (Lowell and Rose-Innes) 28
Fig. 8. Contact charge between metal and insulator. (Rose-Innes, A. C.) 29
Fig. 9. Moving characteristic of charged particles in electric field. 31
Fig. 10. Moving of charged particle in electrode. 32
Fig. 11. Force acting on particle falling in a transverse electric field. 33
Fig. 12. Schematic diagram of particle movement in electric field. 36
Fig. 13. Various tribo chargers of triboelectrostatic separation. 39
Fig. 14. Equipments developed for triboelectrostatic separation. 40
Fig. 15. The charger of a vertical motion developed for work function and tribo series of plastics. 41
Fig. 16. Factors effecting on charging characteristics and separation efficiency on triboelectrostatic separation. 42
Fig. 17. ABS & PBT mixing waste plastic used in this study. 43
Fig. 18. Bench scale triboelectrostatic separator used in this study. 45
Fig. 19. Part details of bench scale triboelectrostatic separator. 46
Fig. 20. A vertical-reciprocation charger set and peripheral measurement. 47
Fig. 21. Flowchart of tribo-charging test by vertical motion charger. 48
Fig. 22. Cutting mill for size reduction of plastic. 48
Fig. 23. Flowchart of material separation test by triboelectrostatic separator. 50
Fig. 24. Deriving method of work function. 52
Fig. 25. Work Function of ABS & PBT used in this study. 56
Fig. 26. Charging property of ABS and PBT as charging materials. 57
Fig. 27. The effect of retention time on charge density of single and mixed plastics. 58
Fig. 28. The effect of rpm on charge density of ABS & PBT. 59
Fig. 29. The effect of relative humidity on charge density of ABS & PBT. 60
Fig. 30. The effect of applied potential on PBT removal and ABS recovery in triboelectrostatic separation. 64
Fig. 31. The effect of air velocity on PBT removal and ABS recovery in triboelectrostatic separation. 65
Fig. 32. The effect of splitter position on PBT removal and ABS recovery in triboelectrostatic separation. 66
Fig. 33. The effect of relative humidity on PBT removal and ABS recovery in triboelectrostatic separation. 67
Fig. 34. Result of repeat tests on optimum conditions of triboelectrostatic separation. 68
Fig. 35. Relation of PBT removal and ABS recovery in triboelectrostatic separation. 69
Fig. 36. Photo of ABS and PBT plastics separated by triboelecrostatic separation. 70