Thermal degradation of a FR-4 type printed circuit board, PCB, containing brominated flame retardant has been studied both in inert and oxidative atmosphere for the emission control of harmful brominated compounds. Th...Thermal degradation of a FR-4 type printed circuit board, PCB, containing brominated flame retardant has been studied both in inert and oxidative atmosphere for the emission control of harmful brominated compounds. The presence of oxygen in atmosphere resulted in the reduction of the yield of hydrogen bromide, one of the major brominated compounds in thermal treatment, and in the enhancement of the formation of bromine and hypobromous acid. The intentional addition of zinc oxide to the PCB powder sample gave rise to the fixation of Br as zinc bromide. It also resulted in the promotion of the release of brominated compounds in comparison to the case of pure PCB. Thus, the addition of the oxide can be a benefit with respect to the bromine fixation and the kinetics of thermal treatment of PCB as well as metal recovery.展开更多
综述了热解技术在废旧印刷电路板(printed c ircu it board,PCB)处理及资源化中应用的研究状况。热解技术可以改善和提高PCB中金属物质的回收效果,减少污染。同时,以热解为基础的PCB中非金属物质回收技术也有着很好的发展前景。PCB热解...综述了热解技术在废旧印刷电路板(printed c ircu it board,PCB)处理及资源化中应用的研究状况。热解技术可以改善和提高PCB中金属物质的回收效果,减少污染。同时,以热解为基础的PCB中非金属物质回收技术也有着很好的发展前景。PCB热解动力学的研究表明其在1000℃以下的热解过程可划分为分别服从不同反应机理的2个阶段。PCB热解产物中的油、气产物可以回收作为化工原料或燃料。PCB热解过程中含溴阻燃剂的转化和迁移规律以及热解产物中含溴污染物的控制和脱除、热解技术与其他PCB资源化技术的合理有效整合是今后研究的重点。展开更多
文摘Thermal degradation of a FR-4 type printed circuit board, PCB, containing brominated flame retardant has been studied both in inert and oxidative atmosphere for the emission control of harmful brominated compounds. The presence of oxygen in atmosphere resulted in the reduction of the yield of hydrogen bromide, one of the major brominated compounds in thermal treatment, and in the enhancement of the formation of bromine and hypobromous acid. The intentional addition of zinc oxide to the PCB powder sample gave rise to the fixation of Br as zinc bromide. It also resulted in the promotion of the release of brominated compounds in comparison to the case of pure PCB. Thus, the addition of the oxide can be a benefit with respect to the bromine fixation and the kinetics of thermal treatment of PCB as well as metal recovery.
文摘综述了热解技术在废旧印刷电路板(printed c ircu it board,PCB)处理及资源化中应用的研究状况。热解技术可以改善和提高PCB中金属物质的回收效果,减少污染。同时,以热解为基础的PCB中非金属物质回收技术也有着很好的发展前景。PCB热解动力学的研究表明其在1000℃以下的热解过程可划分为分别服从不同反应机理的2个阶段。PCB热解产物中的油、气产物可以回收作为化工原料或燃料。PCB热解过程中含溴阻燃剂的转化和迁移规律以及热解产物中含溴污染物的控制和脱除、热解技术与其他PCB资源化技术的合理有效整合是今后研究的重点。
