废弃印刷线路板熔融盐气化及金属回收实验研究
文献类型：学位论文
| ; | |
| 作者 | 李飞 |
| 学位类别 | 博士 |
| 答辩日期 | 2007-06-08 |
| 授予单位 | 中国科学院广州能源研究所 |
| 授予地点 | 广州能源研究所 |
| 导师 | 陈勇 |
| 关键词 | 溴化环氧树脂 印刷线路板 熔融盐 气化 金属回收 |
| 其他题名 | Experimental study on molten salt gasification and metal recovery of waste printed circuit boards |
| 中文摘要 | Along with the rapid development of electronic information industry and the shorter and shorter lifecycle of electric and electronic equipments, the quantity of waste printed circuit boards (PCB) increases largely. Waste PCB contains substantial quantities of reusable materials and significant quantities of hazardous substances such as heavy metals, and brominated organic compounds. Molten salt gasification technology utilizing the high thermal conductivity and strong oxidizing property, provide a technically possiblility to decompose the polymers in PCB effectively, to destroy the brominated organic compounds completely and to prevent the release of organic contaminents. During the gasification process of PCB, the metal contents are detained in molten salt, and can be recovered by dealing with the salts. The molten salt gasification characterstics and metal recovery process of PCB were studied in this persent paper. Firstly the thermal decomposition process of a kind of brominted epoxy resin (BER) printed circuit boards was investigated by TG-FTIR and Py-GC/MS. The experimental results show that during the thermal decomposition process of BER, the brominated parts firtly degraded. The degradation of unbrominated parts happened at higher temperature and the pyrolysis products contained phenol, p-isopropylphenol, p-isopropenylacetylphenol, o-methylphenol and p-methylphenol. The effect of two different kinds of binary eutectic salts on the pyrolysis processes and pyrolysis products characterstics of PCB were studied with a bench scale molten salt reactor. The results show that the binary eutectic salts can decrease the liquid product yield. Consequently, the carbon conversion rate from PCB to gas products is increased greatly. The gasification experiment of PCB was carried out in a molten salt reactor. The results show that the main gas product of PCB molten salt gasification is H2 and CO, which accounts for 70vol% of total gas yield. The gas yield and carbon conversion rate increases with the equivalence ration. Along with the increase of the equivalence ration, the gas heating value decreaseed, and the gasification efficiency increased first and then decreased, which reach maximum 94% when the equivalence ration is 20%. The behavior of bromine during molten salt gasification were investigated. The results show that 73.8wt% bromine of feedstock has been neutralized and absorbed by molten salt, and only 0.006wt% bromine of feedstock was tested in gas products. The detention and distribute behavior of metal during molten salt gasification of PCB was investigated. The results show that over 90% Cu, Al, Ca, Cd, Co, Mg, Sb, Sn, Zn was detained in molten salt. the metallic fraction could be recycled with collecting and dealing with the bottom layers of molten salt. For example, the materials recycled from the bottom layer contained 92.76wt% metal, including 78.06wt% Cu and 9.89wt% Al. Finally, a prediction model on the molten salt gasification of PCB was proposed based on reaction kinetics. With the kinetics model, the steam and CO2 gasification process of PCB in molten salt were calculated. |
| 语种 | 中文 |
| 公开日期 | 2011-07-10 ; 2011-07-15 |
| 页码 | 125 |
| 源URL | [http://ir.giec.ac.cn/handle/344007/3995]  |
| 专题 | 中国科学院广州能源研究所 |
| 推荐引用方式 GB/T 7714 | 李飞. 废弃印刷线路板熔融盐气化及金属回收实验研究, Experimental study on molten salt gasification and metal recovery of waste printed circuit boards[D]. 广州能源研究所. 中国科学院广州能源研究所. 2007. |
入库方式： OAI收割
来源：广州能源研究所
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