PP 75% ABS - PC PVC4 25% 13 3 TA tannic acid Lifshitz-van der waals 8 60 kg t

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1 Research of Environmental Sciences Vol 29 No 2 Feb 2016 J GUO Jin GUO Yuwen RUAN Jiuli et al Research on flotation technique for end-of-life vehicle interior plasticsj Research of Environmental Sciences * PP ABS - - PC PVC 0 22 MPa 10 Lmin ρ15 mgl PP ABS PC PVC PP ABS 100% 98 63% PC PVC 98 95% 100% 0 MPa 6 Lmin ρ10 mgl PPABS 0 24 MPa 10 Lmin 10 mgl 10 mmoll PCPVC PC 92 87% PVC 91 41% PP ABS PC PVC 100% 98 63% 92 87% 91 41% X383X A DOI j issn Research on Flotation Technique for End-of-Life Vehicle Interior Plastics GUO Jin 1 2 GUO Yuwen 2* RUAN Jiuli 2 QIAO Qi 2 ZHANG Jianqiang 1 1 Faculty of Geosciences and Environmental EngineeringSouthwest Jiaotong UniversityChengdu China 2 Ministry of Environmental Protection Key Laboratory of Eco-IndustryChinese Research Academy of Environmental SciencesBeijing China AbstractIt is difficult to separate interior plastic components in end-of-life vehicles ELVsdue to their complex types As flotation has been considered one of the most efficient techniques for plastic separationefficiency of separating interior plastic components of ELVs with flotation technique was explored Aiming at separating four kinds of interior plastic components of ELVsa designed flotation column was used in the laboratory to investigate the effects of parameters such as flotation fluid flowdissolved-air tank pressure and wetting agent concentration on the flotation behaviors The results showed that the primary flotation of PPABSPCPVC achieved the optimal effect with PPABS as floating materials and PCPVC as sinking materials under 15 mgl of tannic acid as wetting agent0 22 MPa of dissolved-air tank pressure and 10 Lmin of flotation fluid flow Floating rates of PPABS were 100% and 98 63% respectivelywhile sinking rates of PCPVC were 98 95% and 100% respectively In the secondary flotationpp and ABS were separated completely under 10 mgl of tannic acid as wetting agent 0 MPa of dissolved-air tank pressure and 6 Lmin of flotation fluid flow PCPVC separation in the secondary flotation achieved the optimal effect with PC floating rate being 92 87% and PVC sinking rate being 91 41% under 10 mgl of tannic acid and 10 mmoll dibutyl sebacate as wetting agent0 24 MPa of dissolved-air tank pressure and 10 Lmin of flotation fluid flow After two stages of flotation screeningthe separating rates of PPABSPC and PVC finally reached 100% 98 63% 92 87% and 91 41% respectively This indicated that the two-stage flotation process developed could achieve effective separation of the four kinds of mixed plastics The two-stage flotation process developed has broad application prospects in separating interior plastic components of ELVs AA jushuaiguojin@ 163 com * guoyw@ craes org cn Keywords end-of-life vehicle plastics flotation resource regeneration 2000

2 PP 75% ABS - PC PVC4 25% 13 3 TA tannic acid Lifshitz-van der waals 8 60 kg t DBS dibutyl sebacate Shibata 25 PVC PC POM PVC PC POM 90 17% 83 16% 99 12% Drelich 26 NaOH PVC PET PVC PET 95% 1 Fig 1 Adsorption model of tannic acid TAon plastic surface

3 % 33 PP ABS PC PVC PP ABS PC PVC 20 g 1 Table 1 List of vehicle interior plastics 15 min 4 PP ABS PC PVC PUR HIPS GFRP GMT SMC 1 2 ρ 4 PP ABS PC F i = M i M itot 100% 1 PVC 5 ~ 10 mm S i = 100% - F i 2 F i i % S i i 1 3 % M i i gm itot i g PP ABS PC PVC PP ABSPC PVC PP ABS PC PVC PP ABS PC PVC PET PC PS PP ABS PET PVC PS 34 PC PVC 1 2 PP ABS PC PVC PP ABS PP ABS PC PVC PP ABS 0 16 MPa 30 mgl 15 min 6 ~ 14 Lmin 3 3 PP PC PVC PP 2 Fig 2 Schematic of flotation equipment 3 PP ABS PC PVC Fig 3 Effects of different flotation fluid flow on PP ABS PC PVC flotation efficiency

4 % PC PVC 0 ABS 4 64% 5 56% 10 Lmin PP ABS PC PVC4 10 Lmin ρ 30 mgl 4 4 PP 5 PP ABS PC PC PVC ABS PVC Fig 5 Effects of wetting agent at different 0 22 MPa 38 41% concentrations on PP ABS PC PVC flotation efficiency ABS ABS ABS 5 mgl 0 22 MPa 4 15 min6 ~ 14 Lmin PP 100% ABS 6 LminABS 14 11% PP ABS PP ABS 6 Lmin 4 PP ABS PC PVC Fig 4 Effects of different dissolved-air tank pressure on PP ABS PC PVC flotation efficiency 0 22 MPa 10 Lmin ρ0 mgl 30 mgl 4 5 PP 100% ABS PC PVC ρ ρ15 mgl ABS 98 63% PC 1 05% PVC 0 4 ρ PP ABS PP ABS 7 7 PP 100% 100% 98 63% PC PVC ABS ρ 1 05% 0 4 ρ 10 mgl ABS 0 PP % PP PP ABS ABS PC PVC ABS 0 MPa ABS PP 6 PP ABS Fig 6 Effects of different flotation fluid flow on PP ABS flotation efficiency 6 Lmin 0 MPa ABS 49 23% 8 69%

5 MPa 7 PP ABS Fig 7 Effects of wetting agent at different concentrations on PP ABS flotation efficiency PC PVC PC PVC PC PVC Fig 9 Effects of different dissolved-air tank 0 16 MPa pressure on PC PVC flotation efficiency 10 mgl 6 mmoll PC PVC 15 min 6 ~ MPa Lmin 8 10 Lmin PVC PC 6 Lmin PC PC PVC ρ 10 65% 10 Lmin PC 0 mgl c 2 mmoll 13 32% PC 20 mmoll 10 PC PVC 10 Lmin PC PVC c 10 8 PC PVC Fig 8 Effects of different flotation fluid flow on PC PVC flotation efficiency 10 Lmin 10 mgl DBS 6 mmoll 15 min c 9 9 PVC PVC PC PVC 0 55% 6 90% PC 0 24 MPa 10 Lmin 10 mgl PC 10 mmoll 0 24 MPa PC PC 92 87% PVC 78 16% 91 41% PC PVC mmoll PC PVC 93 61% 15 62% ρ 10 mgl c 2 mmoll 20 mmoll 2 10 c 10 mmoll PC PVC 92 87% 8 59% ρ 20 mgl c PC PVC c 10 mmoll PC PVC 79 68% 4 7% PC c

6 c PC PVC Fig 10 Effects of DBS at different concentrations on PC PVC flotation efficiency 11 Fig 11 Flotation technique flowchart PP ABS PC PVC4 3 PP ABS PC PVC PP ABS PC PVC 2 ~ 4 a 11 PP ABS PC PVC

7 Mpa 10 J LI Guangyao Lmin PP ABS 0 Mpa 6 Lmin PC PVC 0 24 Mpa 10 Lmin b PP ABS PC PVC 15 discarded automobiles J mgl PP ABS 10 mgl PC PVC 10 mgl 10 mmoll Part Ⅰ a reviewj 268 c 4 PP ABS PC PVC 100% 98 63% 92 87% 91 41% Surface ozonation of polyvinyl chloride for its separation from waste References J JIN Yaning ZHOU Bingyan DING Mingyu et al Analysis of the generation and recycling of packaging waste in ChinaJ Reseach of Environmental Sciences J XIE Minghui LI Li YAN Dahai et al Life cycle assessment to determine environmental impacts from treatment of low-quality plastic packaging using refused-derived fuel method in Beijing J Reseach of Environmental Sciences dissolved air flotation on separation of waste plastics ABS and PS J FANG Haifeng HUANG Yonghe WANG Ke Research on recovery technology of non-metallic materials of ELV J Automotive Technology REN Guangying LIU Shaoyou et al Application and devoloping foreground of plastic for automotive industryj China RubberPlastics Technology and Equipment J ZHANG HongshenZHAO QinghuaCHEN Ming The current situation on recycling and use of typical plastic components of Automobile & Parts CARVALHO T DURO F FERREIRA C Separation of packaging plastics by froth flotation in a continuous pilot plantj Waste Management FRAUNHOLCZ N Separation of waste plastics by froth flotation Minerals Engineering BUZGA H Method and apparatus for separating different plastic productsus P PONGSTABODEE S KUNACHITPIMOL N DAMRONGLERD S Combination of three-stage sink-float method and selective flotation technique for separation of mixed post-consumer plastic wastej Waste Management REDDY M S OKUDA T KUROSE K TSAI T-Y NAKAI S et al plastic mixture by froth floatationj Journal of Material Cycles and Waste Management J CARVALHO M T FERREIRA C SANTOS L R et al Optimization of froth flotation procedure for poly ethylene terephthalate 2 recycling industry J Polymer Engineering and Science J D 16 D J LI Xiao GUO Yuwen RUAN Jiuli et al Impact of different sorting media on the waste plastics separation J Applied Mechanics and Materials ALTER H The recovery of plastics from waste with reference to froth flotation J Resources Consevation and Recycling WANG Hui WANG Chongqing FU Jianpang et al Flotability and flotation separation of polymer materials modulated by wetting agents J Waste Management WANG HuiCHEN XiaoleiBAI Yanget al Application of J Waste Management KANGAL M O Selective flotation technique for separation of PET and HDPE used in drinking water bottlesj Mineral Processing and Extractive Metallurgy Review J J ZHAO Yue HUANG Jia LI Yanpeng et al Research on bubble

8 2 253 attachment behaviour in the flotation process of waste plasticsj Reseach of Environmental Sciences TAKOUNGSAKDAKUN TPONGSTABODEE S Separation of mixed post-consumer PET-POM-PVC plastic waste using selective flotation J Separation and Purification Technology SHIBATA JMATSUMOTO SYAMAMOTO H et al Flotation separation of plastics using selective depressantsj International Journal of Mineral Processing DRELICH J PAYNE T KIM J H et al Selective froth flotation of PVC from PVCPET mixtures for the plastics recycling industry J Polymer Engineering & Science SHEN HuitingFORSSBERG EPUGH R Selective flotation separation of plastics by chemical conditioning with methyl cellulosej ResourcesConservation and Recycling SHEN Huiting PUGH R FORSSBERG E Floatability selectivity and flotation separation of plastics by using a surfactantj Colloids and Surfaces APhysicochemical and Engineering Aspects PASCOE R The use of selective depressants for the separation of ABS and HIPS by froth flotationj Minerals Engineering WANG ChongqingWANG HuiLIU Qun et al Separation of polycarbonate and acrylonitrile-butadiene-styrene waste plastics by froth flotation combined with ammonia pretreatmentj Waste Management KOBLER R W Polyvinyl chloride-polyethylene terephthalathe separation productus P WANG Hui GUO Chao FU Jiangang et al Adsorption behavior of weak hydrophilic substances on low-energy surface in aqueous mediumj Applied Surface Science J D

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untitled 20 1 2010 10 Vol.20 Special 1 The Chinese Journal of Nonferrous Metals Oct. 2010 1004-0609(2010)S1-s0127-05 Ti-6Al-4V 1 2 2 (1. 710016 2., 710049) 500~1 000 20 Ti-6Al-4V(TC4) TC4 800 TC4 800 TC4 TC4 800