Recycling Technologies of PCBs

Mandot, Vivek; Saraswat, Vimal; Jaitawat, Nikunj

doi:10.26476/josa.2017.01.01.6-11

Cited by 5 publications

(2 citation statements)

References 15 publications

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“…• Gasification: Alternatively, gasification processes can be used to convert plastic waste into carbon monoxide and hydrogen, which can be used as raw material for the synthesis of methanol. Gasification has the advantage of avoiding the generation of brominated dioxins by heating plastics at a high temperature followed by a rapid shock cooling under a controlled environment with oxygen and/or steam [85], [86].…”

Section: ) Physical Recycling Methodsmentioning

confidence: 99%

e-WASTE: Everything an ICT Scientist and Developer Should Know

2019

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Every dazzling announcement of a new smart phone or trendy digital device is the prelude to more tons of electronic waste (e-waste) being produced. This e-waste, or electronic scrap, is often improperly added to common garbage, rather than being separated into suitable containers that facilitate the recovery of toxic materials and valuable metals. We are beginning to become aware of the problems that e-waste can generate to our health and the environment. However, most of us are still not motivated enough to take an active part in reversing the situation. The aim of this article is to contribute to increase this motivation by pointing out the significant problem that e-waste represents and its social and environmental implications. We have chosen this forum in which multidisciplinary researchers in ICT from all countries access on regularly to explain the serious problems we are exposed to when we do not make a responsible and correct use of technology. In this paper, we also survey the composition of contemporary electronic devices and the possibilities and difficulties of recycling the elements they contain. As researchers, our contributions in science enable us to find solutions to current problems and to design more and more powerful intelligent devices. But responsible researchers must be aware of the negative effects that this industry causes us and, consequently, assume their commitment with more sustainable designs and developments. Therefore, the knowledge of e-waste issues is crucial also in the scientific world. Researchers should consider this problem and contribute to minimize it or find new solutions to manage it. These must be the additional challenges in our projects.

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Section: ) Physical Recycling Methodsmentioning

confidence: 99%

e-WASTE: Everything an ICT Scientist and Developer Should Know

2019

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“…In addition, PCBs contain one of the highest concentrations of rare and precious metals (RPM). Therefore, such waste has the potential to become a sustainable source of RPM for the manufacturing of future generation electronic equipment [11].…”

Section: Introductionmentioning

confidence: 99%

Selective Disintegration–Milling to Obtain Metal-Rich Particle Fractions from E-Waste

Blumbergs

Serga

Shishkin

et al. 2022

Metals

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Various metals and semiconductors containing printed circuit boards (PCBs) are abundant in any electronic device equipped with controlling and computing features. These devices inevitably constitute e-waste after the end of service life. The typical construction of PCBs includes mechanically and chemically resistive materials, which significantly reduce the reaction rate or even avoid accessing chemical reagents (dissolvents) to target metals. Additionally, the presence of relatively reactive polymers and compounds from PCBs requires high energy consumption and reactive supply due to the formation of undesirable and sometimes environmentally hazardous reaction products. Preliminarily milling PCBs into powder is a promising method for increasing the reaction rate and avoiding liquid and gaseous emissions. Unfortunately, current state-of-the-art milling methods also lead to the presence of significantly more reactive polymers still adhered to milled target metal particles. This paper aims to find a novel and double-step disintegration–milling approach that can provide the formation of metal-rich particle size fractions. The morphology, particle fraction sizes, bulk density, and metal content in produced particles were measured and compared. Research results show the highest bulk density (up to 6.8 g·cm−3) and total metal content (up to 95.2 wt.%) in finest sieved fractions after the one-step milling of PCBs. Therefore, about half of the tested metallic element concentrations are higher in the one-step milled specimen and with lower adhered plastics concentrations than in double-step milled samples.

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