Triboelectric series and charging properties of plastics using the designed vertical-reciprocation charger

Park, Chul Hyun; Park, Jai Koo; Jeon, Ho Seok; Chun, Byoung Chul

doi:10.1016/j.elstat.2008.07.001

Cited by 91 publications

(32 citation statements)

References 29 publications

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“…The triboelectric polymers sequence [112] is an important separation indicator. The sequence explains the polarities gained from the charged particles of plastic, for instance:…”

Section: Triboelectrostatic Separationmentioning

confidence: 99%

Advanced Recovery Techniques for Waste Materials from IT and Telecommunication Equipment Printed Circuit Boards

2019

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Waste from information technology (IT) and telecommunication equipment (WITTE) constitutes a significant fraction of waste from electrical and electronic equipment (WEEE). The presence of rare metals and hazardous materials (e.g., heavy metals or flame retardants) makes the necessary recycling procedures difficult and expensive. Important efforts are being made for Waste Printed Circuit Board (WPCB) recycling because, even if they only amount to 5-10% of the WITTE weight, they constitute up to 80% of the recovered value. This paper summarizes the recycling techniques applicable to WPCBs. In the first part, dismantling and mechanical recycling techniques are presented. Within the frame of electro-mechanical separation technology, the chain process of shredding, washing, and sieving, followed by one or a combination of magnetic, eddy current, corona electrostatic, triboelectrostatic, or gravity separation techniques, is presented. The chemical and electrochemical processes are of utmost importance for the fine separation of metals coming from complex equipment such as WPCBs. Thermal recycling techniques such as pyrolysis and thermal treatment are presented as complementary solutions for achieving both an extra separation stage and thermal energy. As the recycling processes of WPCBs require adequate, efficient, and ecological recycling techniques, the aim of this survey is to identify and highlight the most important ones. Due to the high economic value of the resulting raw materials relative to the WPCBs' weight and composition, their recycling represents both a necessary environmental protection action, as well as an economic opportunity.

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“…The triboelectric polymers sequence [112] is an important separation indicator. The sequence explains the polarities gained from the charged particles of plastic, for instance:…”

Section: Triboelectrostatic Separationmentioning

confidence: 99%

Advanced Recovery Techniques for Waste Materials from IT and Telecommunication Equipment Printed Circuit Boards

2019

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“…The sign obtained by plastic granules and the PET sheet can be explained in relation with the triboelectric series, based on the difference between the work function of the various materials. According to the triboelectric series [19][20], at impact with the PET sheet, the PVC and HDPE granules acquire negative charge, while the PA granules get positively charged. PET (4.42 eV) sheet charges positively in the presence of PVC (5.32 eV) and HDPE (4.72 eV) because its work function is lower.…”

Section: Introductionmentioning

confidence: 99%

Experimental study of the tribocharging process of plastic granular materials on a vibratory feeder device

Buda

Bilici

Samuilă

et al. 2013

IEEE Trans. Dielect. Electr. Insul.

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Triboelectrostatic separation of granular plastics wastes is a technology that is more and more employed in the recycling industry. The paper is aimed at characterizing the tribocharging of Polyvinyl Chloride (PVC), Polyamide (PA) and High Density Polyethylene (HDPE) granules on a vibratory feeder tray covered by a Polyethylene Terephthalate (PET) sheet, in order to evaluate the possibility of using this device in a continuous tribo-electrostatic separation process. A capacitive probe was used to evaluate the surface charge density on the PET sheet. When the tray of the vibratory feeder was grounded, the charge density at the surface of the PET sheet was found to increase slightly after every tribocharging experiment, while the charge of PA granules saturated at 2.6 nC/g. In the case of an isolated PET sheet, its surface charge density is rapidly increasing and tends to saturate, limiting the charge/mass ratio of PA granules at 1.4 nC/g. Similar results were recorded for other tested materials, proving the efficiency of the tribocharging on the PET tray of the vibratory feeder.

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“…The resultant static charge is not usually noticeable unless it occurs in a system where the conductivity of the material surface is low, allowing the charge to build up to high levels [18][19][20][21][22]. This static build-up, which is a significant burden in the handling of large amounts of fine dry powders such as flour or powdered chemicals and polymers, can be effectively employed for sorting differently-charged particles in an electric field [23,24].…”

Section: Introductionmentioning

confidence: 99%

Set‐point identification of a free‐fall triboelectrostatic separation process for plastic particles

Tilmatine

Dascalescu

2010

International Journal of Environmental Studies

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Triboelectric series and charging properties of plastics using the designed vertical-reciprocation charger

Cited by 91 publications

References 29 publications

Advanced Recovery Techniques for Waste Materials from IT and Telecommunication Equipment Printed Circuit Boards

Advanced Recovery Techniques for Waste Materials from IT and Telecommunication Equipment Printed Circuit Boards

Experimental study of the tribocharging process of plastic granular materials on a vibratory feeder device

Set‐point identification of a free‐fall triboelectrostatic separation process for plastic particles

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