多因素对聚氯乙烯和废弃液晶显示屏协同热解氯化提铟的影响
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摘要
聚氯乙烯(polyvinyl chloride,PVC)和废弃液晶显示屏(liquid crystal displays,LCDs)协同热解,可利用PVC产生的氯化氢提取LCDs中的铟,实现废弃PVC塑料和LCDs废物综合利用。通过PVC和LCDs协同热解实验,在PVC热解温度和载气流速一定条件下,采用采用Design-Expert 8.0.5b软件对氯铟比、氯化温度、氯化时间等因素进行实验方案设计和结果分析。结果表明,在其他操作条件一定的前提下,氯铟比、氯化温度、氯化时间对铟回收率的影响均为显著;通过分析实验结果并建立数学模型,最终得到实际可操作的最佳实验条件,其结果为氯化温度为500℃、氯化时间为30 min和氯铟比为11∶1,铟回收率为97.50%。本研究对于废弃PVC塑料和LCDs的资源化综合利用具有重要的参考价值。
Hydrogen chloride generated via polyvinyl chloride(PVC) pyrolysis could be used to recover indium from waste liquid crystal displays(LCDs) via chloridizing metallurgy processes,which in turn achieve the comprehensive utilization of the waste PVC plastic and LCDs. Design-Expert 8. 0. 5b was used to design and analyze the results of experiments to obtain the optimal indium recovery with a constant PVC pyrolysis temperature andcarrier gas flow rate and varying Cl/In ratio,chlorination temperature,and chlorination time. The results indicate that these three factors exert significant influences on the recovery of indium. The indium recovery of each experiment was analyzed,and a mathematical model was established. Indium recovery could reach 97. 50% at the optimal actual operating conditions,i. e.,chlorination temperature of 500 ℃,chlorination time of 30 min,and Cl/In value of 11 ∶ 1. The present study may provide important guidance for the recycling and comprehensive utilization of waste PVC plastic and LCDs.
Hydrogen chloride generated via polyvinyl chloride(PVC) pyrolysis could be used to recover indium from waste liquid crystal displays(LCDs) via chloridizing metallurgy processes,which in turn achieve the comprehensive utilization of the waste PVC plastic and LCDs. Design-Expert 8. 0. 5b was used to design and analyze the results of experiments to obtain the optimal indium recovery with a constant PVC pyrolysis temperature andcarrier gas flow rate and varying Cl/In ratio,chlorination temperature,and chlorination time. The results indicate that these three factors exert significant influences on the recovery of indium. The indium recovery of each experiment was analyzed,and a mathematical model was established. Indium recovery could reach 97. 50% at the optimal actual operating conditions,i. e.,chlorination temperature of 500 ℃,chlorination time of 30 min,and Cl/In value of 11 ∶ 1. The present study may provide important guidance for the recycling and comprehensive utilization of waste PVC plastic and LCDs.
引文
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[2]NNOROM I C,OSIBANJO O.Overview of electronic waste(e-waste)management practices and legislations,and their poor applications in the developing countries[J].Resources,Conservation and Recycling,2008,52(6):843-858
[3]ZHANG Shunli,FORSSBERG E.Mechanical separation-oriented characterization of electronic scrap[J].Resources,Conservation and Recycling,1997,21(4):247-269
[4]翟秀静,周亚光.稀散金属[M].安徽:中国科技大学出版社,2009:81
[5]HE Yunxia,MA En,XU Zhenming.Recycling indium from waste liquid crystal display panel by vacuum carbon-reduction[J].Journal of Hazardous Materials,2014,268:185-190
[6]TAKAHASHI K,SASAKI A,DODBIBA G,et al.Recovering indium from the liquid crystal display of discarded cellular phones by means of chloride-Induced vaporization at relatively low temperature[J].Metallurgical and Materials Transactions A,2009,40A:891-900
[7]LI Jinhui,GAO Song,DUAN Huabo,et al.Recovery of valuable materials from waste liquid crystal display panel[J].Waste Management,2009,29(7):2033-2039
[8]WANG Xinying,LU Xuebin,ZHANG Shuting.Study on the waste liquid crystal display treatment:Focus on the resource recovery[J].Journal of Hazardous Materials,2013,244-245:342-347
[9]LEE C,JEONG M,KILICASLAN M F,et al.Recovery of indium from used LCD panel by a time efficient and environmentally sound method assisted HEBM[J].Waste Management,2013,33(3):730-734
[10]LI Ruidi,YUAN Tiechui,FAN Wenbo,et al.Recovery of indium by acid leaching waste ITO target based on neural network[J].Transactions of Nonferrous Metals Society of China,2014,24(1):257-262
[11]MATSUDA M,AKIYOSHI Y,AKIYOSHI Y.Recovery of indium in the sulfuric acid leaching solution of zinc slag with chelate resin[J].Nippon Kagaku Zassi,1989(12):2012-2017
[12]MA En,LU Rixin,XU Zhenming.An efficient rough vacuum-chlorinated separation method for the recovery of indium from waste liquid crystal display panels[J].Green Chemistry,2012,14:3395-3401
[13]Steady growth forecast for global PVC market till 2021[J].Popular Plastics and Packaging,2014,59(9):71-72
[14]ZHU H M,JIANG X G,YAN J H,et al.TG-FTIR analysis of PVC thermal degradation and HCl removal[J].Journal of Analytical and Applied Pyrolysis,2008,82(1):1-9
[15]SUN Qinglei,SHI Xingang,LIN Yunliang,et al.Thermogravimetric-mass spectrometric study of the pyrolysis behavior of PVC[J].Journal of China University of Mining and Technolgy,2007,17(2):242-245
[16]任浩华,王帅,王芳杰,等.PVC热解过程中HCl的生成及其影响因素[J].中国环境科学,2015,35(8):2460-2469
[17]王帅,关杰,任浩华,等.低温碱溶脱除液晶显示器(LCD)玻璃基板粉末中的硅和铝[J].环境工程学报,2015,9(12):6078-6082
[18]GUAN Jie,WANG Shuai,REN Haohua,et al.Indium recovery from waste liquid crystal displays by polyvinyl chloride waste[J].RSC Advances,2015,5(124):102836-102843
[19]陶有俊,Daniel Tao,赵跃民,等.采用Design-Expert设计进行优化Falcon分选试验[J].中国矿业大学学报,2005,34(3):343-348
[20]梁华,祝俊,钮琰星,等.采用Design-Expert设计进行低温压制饼新型混合溶剂提油研究[J].粮油加工,2008(7):60-63