Electrostatic Separation of Metals and Plastics From Waste Electrical and Electronic Equipment

Dăscălescu, Lucian; Zeghloul, Thami; Iuga, A.

doi:10.1016/b978-0-12-803363-0.00004-3

Cited by 51 publications

(14 citation statements)

References 88 publications

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“…For an effective separation from waste of PA and PC plastic components, a tribo-aero-electrostatic separator was used in [119]. It may also be useful to separate the highly enriched PVC fraction from cable waste [120].…”

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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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 design and principle of operation of the electrostatic separator (ES) depend on the type and physical properties of the input material being separated. Analyzing the scientific literature resources as well as patent descriptions, it can be concluded that there is a large number of different designs and methods of operation of electrostatic separators [18], [21][22][23][24][25]. In general, in terms of the principle of operation two major types of ES can be distinguished: (a) separators in which the difference of charge decay of the materials is utilized to perform separation and (b) separators utilising triboelectric phenomena.…”

Section: Electrostatic Plastic Waste Separationmentioning

confidence: 99%

Concept and Design of the Test Bench for Electrostatic Separation in Plastic Recycling Application

Czarnecka‐Komorowska

Jędryczka²,

Sędziak³

et al. 2022

MATEC Web Conf.

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Plastics recycling has become a key industry in developed countries, to reduce ecological damage and save non-renewable resources. This paper discusses the concept and the design of electrostatic separator as a test bench for the separation of different plastics in recycling applications. In the automotive recycling process, all these waste materials must be processed further for re-entering the cycle or thermal utilization. The following application presents the possibility of research and technological tests by changing several parameters, such as a position of the electrodes, control of the polarity and voltage, variable speed of feeder and drum, and also tribo-electrification parameters (time, intensity). The impact of process parameters on the efficiency of the plastic separation can be analyzed by the developed a specialized computer vision system. The preliminary results of conducted tests showed that separation is dependent on many variations of parameters. The results of this study indicate that the proposed innovative design of the research stand ensures the high research potential of the proposed equipment.

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“…The sorting and processing will vary greatly from location to location due to different plastic waste collection processes, waste stream composition, recycling infrastructures, available equipment, and capacity, but also by the recycled plastic type market demand [21]. There are several separation and identification techniques which can be used, such as sinkfloat [65,66], froth flotation [67], near/mid infrared spectroscopy [68][69][70], X-ray fluorescence spectroscopy [71,72], hydrocyclones [73][74][75], tribo-electrostatic [76][77][78], magnetic density sorting [79,80], magnetic levitation [81,82], hyperspectral imaging [83][84][85], laser induced breakdown spectroscopy [86][87][88], hybrid jig [89], and many others. There are several reviews in the literature discussing the techniques, principles, advantages, and drawbacks in detail [18,46,79,[90][91][92][93][94].…”

Section: Mechanical Recyclingmentioning

confidence: 99%

Polyolefins and Polyethylene Terephthalate Package Wastes: Recycling and Use in Composites

et al. 2021

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Plastics are versatile materials used in a variety of sectors that have seen a rapid increase in their global production. Millions of tonnes of plastic wastes are generated each year, which puts pressure on plastic waste management methods to prevent their accumulation within the environment. Recycling is an attractive disposal method and aids the initiative of a circular plastic economy, but recycling still has challenges to overcome. This review starts with an overview of the current European recycling strategies for solid plastic waste and the challenges faced. Emphasis lies on the recycling of polyolefins (POs) and polyethylene terephthalate (PET) which are found in plastic packaging, as packaging contributes a signification proportion to solid plastic wastes. Both sections, the recycling of POs and PET, discuss the sources of wastes, chemical and mechanical recycling, effects of recycling on the material properties, strategies to improve the performance of recycled POs and PET, and finally the applications of recycled POs and PET. The review concludes with a discussion of the future potential and opportunities of recycled POs and PET.

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Electrostatic Separation of Metals and Plastics From Waste Electrical and Electronic Equipment

Cited by 51 publications

References 88 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

Concept and Design of the Test Bench for Electrostatic Separation in Plastic Recycling Application

Polyolefins and Polyethylene Terephthalate Package Wastes: Recycling and Use in Composites

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