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《Research of Environmental Sciences》 2016-02
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Research on Flotation Technique for End-of-Life Vehicle Interior Plastics

GUO Jin;GUO Yuwen;RUAN Jiuli;QIAO Qi;ZHANG Jianqiang;Faculty of Geosciences and Environmental Engineering,Southwest Jiaotong University;Ministry of Environmental Protection Key Laboratory of Eco-Industry,Chinese Research Academy of Environmental Sciences;  
It is difficult to separate interior plastic components in end-of-life vehicles( ELVs) due to their complex types. As flotation has been considered one of the most efficient techniques for plastic separation,efficiency of separating interior plastic components of ELVs with flotation technique was explored. Aiming at separating four kinds of interior plastic components of ELVs,a designed flotation column was used in the laboratory to investigate the effects of parameters such as flotation fluid flow,dissolved-air tank pressure and wetting agent concentration on the flotation behaviors. The results showed that the primary flotation of PP/ABS/PC/PVC achieved the optimal effect with PP/ABS as floating materials and PC/PVC as sinking materials under 15 mg/L of tannic acid as wetting agent,0. 22 MPa of dissolved-air tank pressure and 10 L/min of flotation fluid flow. Floating rates of PP/ABS were 100% and 98. 63% respectively,while sinking rates of PC/PVC were 98. 95% and 100% respectively. In the secondary flotation,PP and ABS were separated completely under 10 mg/L of tannic acid as wetting agent,0 MPa of dissolved-air tank pressure and 6 L/min of flotation fluid flow. PC/PVC 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 mg/L of tannic acid and 10 mmol/L dibutyl sebacate as wetting agent,0. 24 MPa of dissolved-air tank pressure and 10 L/min of flotation fluid flow. After two stages of flotation screening,the separating rates of PP,ABS,PC 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.
【Fund】: 国家高技术研究发展计划(863)项目(2012AA063007)
【CateGory Index】: X705
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