Impact of nonconductive powder on electrostatic separation for recycling crushed waste printed circuit board

Wu, Jing; Qin, Yufeng; Zhou, Quan; Xu, Zhenming

doi:10.1016/j.jhazmat.2008.09.061

Cited by 23 publications

(16 citation statements)

References 11 publications

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“…Nonconductive powder (NP), produced during the grinding process, will bring about obvious surface phenomena in the separation process (Wu et al, 2009). In addition, the superficial moisture of feeding materials can affect the nonconductive particles’ conductivity and charge when they pass through the electrical field.…”

Section: The Case Studymentioning

confidence: 99%

Management strategies on the industrialization road of state-of- the-art technologies for e-waste recycling: the case study of electrostatic separation—a review

Xue

2012

Waste Manag Res

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Electronic waste (e-waste) management is pressing as global production has increased significantly in the past few years and is rising continuously at a fast rate. Many countries are facing hazardous e-waste mountains, most of which are disposed of by backyard recyclers, creating serious threats to public health and ecosystems. Industrialization of state-of-the-art recycling technologies is imperative to enhance the comprehensive utilization of resources and to protect the environment. This article aims to provide an overview of management strategies solving the crucial problems during the process of industrialization. A typical case study of electrostatic separation for recycling waste printed circuit boards was discussed in terms of parameters optimization, materials flow control, noise assessment, risk assessment, economic evaluation and social benefits analysis. The comprehensive view provided by the review could be helpful to the progress of the e-waste recycling industry.

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Section: The Case Studymentioning

confidence: 99%

Management strategies on the industrialization road of state-of- the-art technologies for e-waste recycling: the case study of electrostatic separation—a review

Xue

2012

Waste Manag Res

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“…There was still aggregated nonmetal powder found in the CES; screening and vibrating could be used to decrease the occurrence of the aggregated phenomenon, as shown in Figure 1(a), where the nonmetal aggregations block the feed inlet, which leads to most of the materials blocking the feed inlet. This phenomenon sharply decreases the productivity of CES (Wu et al, 2009). In the process of CES, when the electric field strength exceeds the dielectric field strength of air, the spark discharges happen, which impact the distribution of the electric field of CES (Mihalcioiu et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

“…When the van der Waals force acting between the nonmetal particles is greater than its gravity force, the aggregation is inevitable. Some of the ultra-fine particles aggregated together (Wu et al, 2009) and impacted the process of separation. There was still aggregated nonmetal powder found in the CES; screening and vibrating could be used to decrease the occurrence of the aggregated phenomenon, as shown in Figure 1(a), where the nonmetal aggregations block the feed inlet, which leads to most of the materials blocking the feed inlet.…”

Section: Introductionmentioning

confidence: 99%

Real-time monitoring system for improving corona electrostatic separation in the process of recovering waste printed circuit boards

Zhou

2014

Waste Manag Res

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Although corona electrostatic separation is successfully used in recycling waste printed circuit boards in industrial applications, there are problems that cannot be resolved completely, such as nonmetal particle aggregation and spark discharge. Both of these problems damage the process of separation and are not easy to identify during the process of separation in industrial applications. This paper provides a systematic study on a real-time monitoring system. Weight monitoring systems were established to continuously monitor the separation process. A Virtual Instrumentation program written by LabVIEW was utilized to sample and analyse the mass increment of the middling product. It includes four modules: historical data storage, steady-state analysis, data computing and alarm. Three kinds of operating conditions were used to verify the applicability of the monitoring system. It was found that the system achieved the goal of monitoring during the separation process and realized the function of real-time analysis of the received data. The system also gave comprehensible feedback on the accidents of material blockages in the feed inlet and high-voltage spark discharge. With the warning function of the alarm system, the whole monitoring system could save the human cost and help the new technology to be more easily applied in industry.

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“…The conductive and nonconductive particles entering the electric field are subjected to electrostatic induction and ionic bombardment. The conductive particles are quickly discharged to the grounded roller while the nonconductive particles are drawn to the spinning roller and into the holding compartments (Wu et al, 2008, Wu et al, 2009Li et al, 2008a;Li et al, 2008b).…”

Section: Introductionmentioning

confidence: 99%

Operational conditions of an electrostatic separator for concentrate copper from electronic waste

2018

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Interest in recycling for the recovery of valuable substances, such as precious metals from electric and electronic waste has been increasing year after year due to the large amount present in such waste compared to primary sources. There is environmental concern, since the amount of this kind of waste is increasing due to rapid technological advances. This study aimed to test the different operating conditions of an electrostatic separator for the concentration of copper from printer circuit boards (PCB). The PCBs were milled in knife mills and separated according to the difference of granule sizes into two fractions: A (<0.5 mm); B (0.5

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Impact of nonconductive powder on electrostatic separation for recycling crushed waste printed circuit board

Cited by 23 publications

References 11 publications

Management strategies on the industrialization road of state-of- the-art technologies for e-waste recycling: the case study of electrostatic separation—a review

Management strategies on the industrialization road of state-of- the-art technologies for e-waste recycling: the case study of electrostatic separation—a review

Real-time monitoring system for improving corona electrostatic separation in the process of recovering waste printed circuit boards

Operational conditions of an electrostatic separator for concentrate copper from electronic waste

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