阴极射线管锥玻璃碳热还原强化酸浸脱铅
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摘要
通过碳热还原强化酸浸的方法高效去除CRT锥玻璃中的重金属铅,同时将脱铅残渣转变为玻璃微珠产品。实验考察了还原温度、碳粉加入量和保温时间对锥玻璃中铅浸出效果的影响。研究结果表明,经碳热还原预处理后锥玻璃中的氧化铅转变为单质铅并主要富集在玻璃微珠表面,通过酸浸处理可高效回收锥玻璃中的铅。当锥玻璃与10%碳粉混合均匀,在1 200℃条件下处理30 min,锥玻璃中铅的浸出效率可达94.80%,脱铅残渣为粒径范围1~15μm的玻璃微珠。
In this paper,Pb O in funnel glass was efficiently removed by acid leaching enhanced by carbon thermal reduction and the residue was prepared into glass microspheres synchronously. The influencing factors included the reduction temperature,amount of carbon added,and the holding time. The results indicated that Pb O in the funnel glass can be quickly reduced to metallic Pb and were mainly located on the surface of the glass microspheres. Therefore,the generated Pb can be efficiently removed by acid leaching. The leaching rate of Pb was 94. 80% when the temperature,added carbon amount,and holding time were fixed at 1 200 ℃,10% and30 min,respectively. Spherical glass microspheres of 1 to 15 μm were obtained after the acid leaching treatment.
In this paper,Pb O in funnel glass was efficiently removed by acid leaching enhanced by carbon thermal reduction and the residue was prepared into glass microspheres synchronously. The influencing factors included the reduction temperature,amount of carbon added,and the holding time. The results indicated that Pb O in the funnel glass can be quickly reduced to metallic Pb and were mainly located on the surface of the glass microspheres. Therefore,the generated Pb can be efficiently removed by acid leaching. The leaching rate of Pb was 94. 80% when the temperature,added carbon amount,and holding time were fixed at 1 200 ℃,10% and30 min,respectively. Spherical glass microspheres of 1 to 15 μm were obtained after the acid leaching treatment.
引文
[1]李金惠,温雪峰.电子废物处理技术.北京:中国环境科学出版社,2006
[2]CHEN Mengjun,ZHANG Fushen,ZHU Jianxin.Effective utilization of waste cathode ray tube glass-crystalline silicotitanate synthesis.Journal of Hazardous Materials,2010,182(1/2/3):45-49
[3]MéAR F.,YOT P.,CAMBON M.,et al.The characterization of waste cathode-ray tube glass.Waste Management,2006,26(12):1468-1476
[4]YAMASHITA M.,WANNAGON A.,MATSUMOTO S.,et al.Leaching behavior of CRT funnel glass.Journal of Hazardous Materials,2010,184(1/2/3):58-64
[5]YOT P.G.,MAR F.Characterization of lead,barium and strontium leachability from foam glasses elaborated using waste cathode ray-tube glasses.Journal of Hazardous Materials,2011,185(1):236-241
[6]连汇汇,苑文仪,吴晓阳,等.利用废CRT屏玻璃为原料制备泡沫玻璃.环境工程学报,2012,6(1):292-296LIAN Huihui,YUAN Wenyi,WU Xiaoyang,et al.Foam glass prepared from scrap CRT panel glass.Chinese Journal of Environmental Engineering,2012,6(1):292-296(in Chinese)
[7]阎利,史抗洪,刘应宗.废弃CRT玻璃的建材化处理处置与再生利用.安阳工学院学报,2005(6):4-9YAN Li,SHI Kanghong,LIU Yingzong.Approaches to the treatment,disposal and resource recovery of end-of-life of crt glass deserted as building material.Journal of Anyang Institute of Technology,2005(6):4-9(in Chinese)
[8]MéAR F.,YOT P.,CAMBON M.,et al.The changes in lead silicate glasses induced by the addition of a reducing agent(Ti N or Si C).Journal of Non-Crystalline Solids,2005,351(40/41/42):3314-3319
[9]MéAR F.O.,YOT P.G.,KOLOBOV A.V.,et al.Local structure around lead,barium and strontium in waste cathode-ray tube glasses.Journal of Non-Crystalline Solids,2007,353(52/53/54):4640-4646
[10]苑文仪,李金惠,张承龙,等.机械活化对CRT锥玻璃浸出动力学的影响.环境工程学报,2014,8(8):3390-3394YUAN Wenyi,LI Jinhui,ZHANG Chenglong,et al.Influence of mechanical activation on leaching kinetics of CRT funnel glass.Chinese Journal of Environmental Engineering,2014,8(8):3390-3394(in Chinese)
[11]SASAI R.,KUBO H.,KAMIYA M.,et al.Development of an eco-friendly material recycling process for spent lead glass using a mechanochemical process and Na2EDTA reagent.Environmental Science&Technology,2008,42(11):4159-4164
[12]MIYOSHI H.,CHEN Danping,AKAI T.A novel process utilizing subcritical water to remove lead from wasted lead silicate glass.Chemistry Letters,2004,33(8):956-957
[13]SATERLAY A.J.,WILKINS S.J.,COMPTON R.G.Towards greener disposal of waste cathode ray tubes via ultrasonically enhanced lead leaching.Green Chemistry,2001,3(4):149-155
[14]YOT P.G.,MéAR F.O.Influence of Al N,Ti N and Si C reduction on the structural environment of lead in waste cathode-ray tubes glass:An X-ray absorption spectroscopy study.Journal of Physics:Condensed Matter,2009,21(28):285104-285111
[15]XING Mingfei,ZHANG Fushen.Nano-lead particle synthesis from waste cathode ray-tube funnel glass.Journal of Hazardous Materials,2011,194:407-413
[16]王建波,陈梦君,张付申,等.阴极射线管锥玻璃真空碳热还原除铅机理研究.环境科学与技术,2013,36(4):125-128WANG Jianbo,CHEN Mengjun,ZHANG Fushen,et al.Vacuum carbonthermic reduction analysis for removing lead from cathode ray tube funnel glass.Environmental Science&Technology,2013,36(4):125-128(in Chinese)
[17]高燕,吴从亮,谢菲琳,等.利用陶粒和玻璃微珠制备轻质高强混凝土的研究.砖瓦,2013(11):9-12GAO Yan,WU Congliang,XIE Feilin,et al.Preparation of high-strength lightweight concrete with glass beads and ceramsite.Block-Brick-Tile,2013(11):9-12(in Chinese)
[18]陈永鑫,姚正军,周金堂,等.中空玻璃微珠增强酚醛泡沫的压缩性能及热稳定性.复合材料学报,2014,31(4):873-879CHEN Yongxin,YAO Zhengjun,ZHOU Jintang,et al.Compressive property and thermal stability of hollow glass bead reinforced phenolic foams.Acta Materiae Compositae Sinica,2014,31(4):873-879(in Chinese)
[2]CHEN Mengjun,ZHANG Fushen,ZHU Jianxin.Effective utilization of waste cathode ray tube glass-crystalline silicotitanate synthesis.Journal of Hazardous Materials,2010,182(1/2/3):45-49
[3]MéAR F.,YOT P.,CAMBON M.,et al.The characterization of waste cathode-ray tube glass.Waste Management,2006,26(12):1468-1476
[4]YAMASHITA M.,WANNAGON A.,MATSUMOTO S.,et al.Leaching behavior of CRT funnel glass.Journal of Hazardous Materials,2010,184(1/2/3):58-64
[5]YOT P.G.,MAR F.Characterization of lead,barium and strontium leachability from foam glasses elaborated using waste cathode ray-tube glasses.Journal of Hazardous Materials,2011,185(1):236-241
[6]连汇汇,苑文仪,吴晓阳,等.利用废CRT屏玻璃为原料制备泡沫玻璃.环境工程学报,2012,6(1):292-296LIAN Huihui,YUAN Wenyi,WU Xiaoyang,et al.Foam glass prepared from scrap CRT panel glass.Chinese Journal of Environmental Engineering,2012,6(1):292-296(in Chinese)
[7]阎利,史抗洪,刘应宗.废弃CRT玻璃的建材化处理处置与再生利用.安阳工学院学报,2005(6):4-9YAN Li,SHI Kanghong,LIU Yingzong.Approaches to the treatment,disposal and resource recovery of end-of-life of crt glass deserted as building material.Journal of Anyang Institute of Technology,2005(6):4-9(in Chinese)
[8]MéAR F.,YOT P.,CAMBON M.,et al.The changes in lead silicate glasses induced by the addition of a reducing agent(Ti N or Si C).Journal of Non-Crystalline Solids,2005,351(40/41/42):3314-3319
[9]MéAR F.O.,YOT P.G.,KOLOBOV A.V.,et al.Local structure around lead,barium and strontium in waste cathode-ray tube glasses.Journal of Non-Crystalline Solids,2007,353(52/53/54):4640-4646
[10]苑文仪,李金惠,张承龙,等.机械活化对CRT锥玻璃浸出动力学的影响.环境工程学报,2014,8(8):3390-3394YUAN Wenyi,LI Jinhui,ZHANG Chenglong,et al.Influence of mechanical activation on leaching kinetics of CRT funnel glass.Chinese Journal of Environmental Engineering,2014,8(8):3390-3394(in Chinese)
[11]SASAI R.,KUBO H.,KAMIYA M.,et al.Development of an eco-friendly material recycling process for spent lead glass using a mechanochemical process and Na2EDTA reagent.Environmental Science&Technology,2008,42(11):4159-4164
[12]MIYOSHI H.,CHEN Danping,AKAI T.A novel process utilizing subcritical water to remove lead from wasted lead silicate glass.Chemistry Letters,2004,33(8):956-957
[13]SATERLAY A.J.,WILKINS S.J.,COMPTON R.G.Towards greener disposal of waste cathode ray tubes via ultrasonically enhanced lead leaching.Green Chemistry,2001,3(4):149-155
[14]YOT P.G.,MéAR F.O.Influence of Al N,Ti N and Si C reduction on the structural environment of lead in waste cathode-ray tubes glass:An X-ray absorption spectroscopy study.Journal of Physics:Condensed Matter,2009,21(28):285104-285111
[15]XING Mingfei,ZHANG Fushen.Nano-lead particle synthesis from waste cathode ray-tube funnel glass.Journal of Hazardous Materials,2011,194:407-413
[16]王建波,陈梦君,张付申,等.阴极射线管锥玻璃真空碳热还原除铅机理研究.环境科学与技术,2013,36(4):125-128WANG Jianbo,CHEN Mengjun,ZHANG Fushen,et al.Vacuum carbonthermic reduction analysis for removing lead from cathode ray tube funnel glass.Environmental Science&Technology,2013,36(4):125-128(in Chinese)
[17]高燕,吴从亮,谢菲琳,等.利用陶粒和玻璃微珠制备轻质高强混凝土的研究.砖瓦,2013(11):9-12GAO Yan,WU Congliang,XIE Feilin,et al.Preparation of high-strength lightweight concrete with glass beads and ceramsite.Block-Brick-Tile,2013(11):9-12(in Chinese)
[18]陈永鑫,姚正军,周金堂,等.中空玻璃微珠增强酚醛泡沫的压缩性能及热稳定性.复合材料学报,2014,31(4):873-879CHEN Yongxin,YAO Zhengjun,ZHOU Jintang,et al.Compressive property and thermal stability of hollow glass bead reinforced phenolic foams.Acta Materiae Compositae Sinica,2014,31(4):873-879(in Chinese)