Characteristic of low-temperature pyrolysis of printed circuit boards subjected to various atmosphere

Li, Jinhui; Duan, Huabo; Yu, Keli; Liu, Lili; Wang, Siting

doi:10.1016/j.resconrec.2009.12.011

Cited by 101 publications

(32 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The temperature region in which the HBr was released from BFRs was between 200 and 300°C. It has been reported that in traditional thermal degradation process, BFRs was decomposed from 297°C to 400°C [27]. Hence, compared with the traditional thermal degradation process, the degradation temperature region of BFRs can be obviously reduced under the SBWO reaction conditions.…”

Section: Debromination Behavior Of Waste Pcbs In Sbwo Co-treatmentmentioning

confidence: 99%

Co-treatment of waste printed circuit boards and polyvinyl chloride by subcritical water oxidation: Removal of brominated flame retardants and recovery of Cu and Pb

Xiu

Zhang

2014

Chemical Engineering Journal

View full text Add to dashboard Cite

h i g h l i g h t sWe report an effective process for co-treatment of waste PCBs and PVC. Brominated flame retardants can be decomposed efficiently in co-treatment. Dechlorination of PVC was complete and safe. Cu and Pb in waste printed circuit boards can be recovered efficiently. Sn and Cr can be immobilized efficiently in the residue after co-treatment. t r a c tIn this work, an effective process for removal of brominated flame retardants (BFRs) and recovery of Cu and Pb from waste printed circuit boards (PCBs) was developed. In the process, waste PCBs and polyvinyl chloride (PVC) were co-treated by subcritical water oxidation (SBWO). PVC was used as a hydrochloric acid source and waste PCBs was used as a neutralizing reagent for the produced HCl. The dechlorination of PVC, removal of BFRs, and recovery of Cu and Pb could be achieved simultaneously by the one-step SBWO reaction. Experimental results showed that the dechlorination of PVC was complete when SBWO temperature exceeded 250°C. SBWO co-treatment was high efficient for the leaching of Cu and Pb from waste PCBs, and XRD spectra indicated that Sn was immobilized as SnO 2 in the residue after co-treatment. The optimum SBWO co-treatment conditions were temperature of 350°C, time of 60 min, solidliquid ratio of 1:9 g/ml, and PVC-to-PCBs ratio of 1:1, respectively. In the optimized co-treatment, 98.9% of Cu and 80% of Pb were recovered, while the leaching efficiencies of Sn and Cr were 15.3% and 3.9%, respectively. Meanwhile, approximately 100% of the bromine was changed into HBr and enriched in water after co-treatment.

show abstract

Section: Debromination Behavior Of Waste Pcbs In Sbwo Co-treatmentmentioning

confidence: 99%

Co-treatment of waste printed circuit boards and polyvinyl chloride by subcritical water oxidation: Removal of brominated flame retardants and recovery of Cu and Pb

Xiu

Zhang

2014

Chemical Engineering Journal

View full text Add to dashboard Cite

show abstract

“…3, in which PCBs are treated under horizontal rotating equipment at temperature from 240 to 280 °C to separate solder, transistors, capacitors and circuit boards. Within this range of temperature, only solders are melt while the rests are restricted weight loss [43]. The outputs per tonne of treated PCBs from this process consist of approximately 44 kg of solder metals, 176 kg of average and small components (e.g., chips, transistors, small capacitors), 100 kg of the second largest size components (7) Adding sodium bisulfite to the solution∶ 2AuCl 3 (5), (5*), (6) and (7) Table 3 (e.g., capacitors) and the rest is the largest parts: boards (after removal of components) at the amount of 680 kg.…”

Section: Pcb Treatmentmentioning

confidence: 99%

Processes in informal end-processing of e-waste generated from personal computers in Vietnam

Tran

Salhofer

2017

J Mater Cycles Waste Manag

View full text Add to dashboard Cite

“…were disassembled, the PCBs were first cut into 10 cm × 2 cm pieces and then pretreated by thermal shock process followed the methods of Li et al [27] with minor modifications. Thermal shock process was carried out at 270 • C for 30 min in a tubular type muffle furnace for the improvement of crushing performance.…”

Section: Materials and Sample Preparationmentioning

confidence: 99%

Synthesis of cuprous chloride and simultaneous recovery of Ag and Pd from waste printed circuit boards

Zhang

2013

Journal of Hazardous Materials

View full text Add to dashboard Cite

h i g h l i g h t s• An environmentally friendly process was developed for high quality cuprous chloride synthesis from waste PCBs.• Neither corrosive acid nor strong oxidant was used in the process.• Ag and Pd were simultaneously recovered during cuprous chloride synthesis.• A much faster reaction rate was achieved compared with other recovery methods.a r t i c l e i n f o t r a c tA benign and effective process for cuprous chloride synthesis and simultaneously recovery of Ag and Pd from waste printed circuit boards (PCBs) was developed in the present study. The main merit of the process is that neither corrosive acid nor strong oxidant was used. The PCBs were firstly pretreated by thermal shock process to obtain metallic particles (MPs), then cuprous chloride was synthesized by reacting MPs with cupric sulfate in the presence of sodium chloride. The optimum V Nacl /m CuSO 4 (mL/g) ratio, [Cu]/[Cu 2+ ] mole ratio, treatment time and operation temperature were 6, 0.95, 30 min and 60 • C, respectively. Approximately 98.5% of Cu could be recovered from the PCBs through two synthesis circles. During the synthesis process, Ag and Pd could be simultaneously recovered by forming a stable chloride complex since Cu 2+ played the role of oxidant in the system. The recovery percentages of Ag and Pd were 93.9% and 95.3%, respectively. Accordingly, it is believed that the process developed in the current study is benign and practical for copper and precious metal (Ag, Pd) recovery from waste PCBs.

show abstract

Characteristic of low-temperature pyrolysis of printed circuit boards subjected to various atmosphere

Cited by 101 publications

References 30 publications

Co-treatment of waste printed circuit boards and polyvinyl chloride by subcritical water oxidation: Removal of brominated flame retardants and recovery of Cu and Pb

Co-treatment of waste printed circuit boards and polyvinyl chloride by subcritical water oxidation: Removal of brominated flame retardants and recovery of Cu and Pb

Processes in informal end-processing of e-waste generated from personal computers in Vietnam

Synthesis of cuprous chloride and simultaneous recovery of Ag and Pd from waste printed circuit boards

Contact Info

Product

Resources

About