scholarly journals A Review of Technology of Metal Recovery from Electronic Waste

10.5772/61569 ◽  
2016 ◽  
Author(s):  
Ari Vidyadhar
Keyword(s):  
Electronic Waste ◽  
Metal Recovery

Advancements in the treatment and processing of electronic waste with sustainability: a review of metal extraction and recovery technologies

2019 ◽  
Vol 21 (5) ◽  
pp. 919-936 ◽  
Author(s):  
Emily Hsu ◽  
Katayun Barmak ◽  
Alan C. West ◽  
Ah-Hyung A. Park
Keyword(s):  
Green Chemistry ◽  
Electronic Waste ◽  
Waste Recycling ◽  
Metal Recovery ◽  
Metal Extraction ◽  
Current Status

This review highlights the current status of e-waste recycling and provides insights on metal recovery from e-waste via green chemistry.

Electronic waste generation, regulation and metal recovery: a review

2020 ◽  
Author(s):  
Rajarathinam Nithya ◽  
Chandrasekaran Sivasankari ◽  
Arunachalam Thirunavukkarasu
Keyword(s):  
Electronic Waste ◽  
Metal Recovery ◽  
Waste Generation

Light-activated polydopamine coatings for efficient metal recovery from electronic waste

2021 ◽  
Vol 254 ◽  
pp. 117674 ◽  
Author(s):  
Kyeong Rak Kim ◽  
Jeonga Kim ◽  
Jin Woong Kim ◽  
Cafer T. Yavuz ◽  
Moon Young Yang ◽  
...  
Keyword(s):  
Electronic Waste ◽  
Metal Recovery

scholarly journals Resources Recovery from Electronic Waste

2020 ◽  
Author(s):  
Mohit Arora
Keyword(s):  
Nitric Acid ◽  
Printed Circuit Boards ◽  
Extraction Efficiency ◽  
Electronic Waste ◽  
Mineral Processing ◽  
Metal Recovery ◽  
Circuit Boards ◽  
Gold Extraction ◽  
Printed Circuit ◽  
Thiosulfate Leaching

Printed Circuit Boards in electronic scrap are richest source of base and precious metals, promoting economic drive for metal recovery. Recovery of these metals is a difficult exercise due to complex nature of electronic waste. India is one of the leading electronic waste processing hubs where more than 95% recyclers are unorganised/non-formal, lacking such a recovery facility. An efficient metal recovery protocol with lesser environmental impact remains unavailable to unorganised recyclers. In current study, an attempt has been made to combine various hydrometallurgical methods to achieve efficient metal recovery from Printed Circuit Boards. Mimicking mineral processing protocols for metal recovery from electronic waste has been a key feature of presented research. Printed Circuit Boards of personal computers were reduced to a size ≤ 2.5 mm and were used as sample for metal recovery. Copper and silver were extracted by selective leaching using Nitric Acid. Maximum extraction efficiency of 96.8% and 99.9% were achieved for copper and silver respectively. Nitric Acid was extracted using solvent extraction method to minimize the environmental damage of remaining waste as well as for reuse in next leaching cycle. Electrodeposition of copper was done on copper cathode with stainless steel and lead anodes with a maximum recovery efficiency of 89.6%. For extraction and recovery of gold and silver, various techniques used in mineral processing were applied in this research. Thiosulfate leaching was chosen for gold extraction due to its proven environment friendly properties. Maximum gold extraction efficiency of 74.3% has been achieved in this work. To recover gold from pregnant solution, zinc cementation approach was used. Up to 85.9% gold was recovered with zinc cementation. Success of thiosulfate leaching and cementation confirms the validity of mineralprocessing techniques in metal recovery from electronic waste. Research in this study can serve as a backbone for potential environmentally sound technology towards efficient metal recovery from electronic waste for small and medium scale recyclers.

scholarly journals Electrochemical Approaches for the Recovery of Metals from Electronic Waste: A Critical Review

Recycling ◽  
2021 ◽  
Vol 6 (3) ◽  
pp. 53
Author(s):  
Varun Rai ◽  
Daobin Liu ◽  
Dong Xia ◽  
Yamuna Jayaraman ◽  
Jean-Christophe P. Gabriel
Keyword(s):  
Critical Review ◽  
Recent Progress ◽  
Electronic Waste ◽  
Metal Recovery ◽  
Review Article ◽  
Ionic Form ◽  
Precise Control ◽  
Electrochemical Processes ◽  
Pre Treatment ◽  
Significant Attention

Electronic waste (e-waste) management and recycling are gaining significant attention due to the presence of precious, critical, or strategic metals combined with the associated environmental burden of recovering metals from natural mines. Metal recovery from e-waste is being prioritized in metallurgical extraction owing to the fast depletion of natural mineral ores and the limited geographical availability of critical and/or strategic metals. Following collection, sorting, and physical pre-treatment of e-waste, electrochemical processes-based metal recovery involves leaching metals in an ionic form in a suitable electrolyte. Electrochemical metal recovery from e-waste uses much less solvent (minimal reagent) and shows convenient and precise control, reduced energy consumption, and low environmental impact. This critical review article covers recent progress in such electrochemical metal recovery from e-waste, emphasizing the comparative significance of electrochemical methods over other methods in the context of an industrial perspective.

scholarly journals Precious metal recovery from electronic waste by a porous porphyrin polymer

2020 ◽  
pp. 202000606 ◽  
Author(s):  
Yeongran Hong ◽  
Damien Thirion ◽  
Saravanan Subramanian ◽  
Mi Yoo ◽  
Hyuk Choi ◽  
...  
Keyword(s):  
Precious Metal ◽  
Density Functional ◽  
Printed Circuit Boards ◽  
Electronic Waste ◽  
Precious Metals ◽  
Metal Recovery ◽  
Porous Polymer ◽  
Circuit Boards ◽  
Functional Theory ◽  
Printed Circuit

Urban mining of precious metals from electronic waste, such as printed circuit boards (PCB), is not yet feasible because of the lengthy isolation process, health risks, and environmental impact. Although porous polymers are particularly effective toward the capture of metal contaminants, those with porphyrin linkers have not yet been considered for precious metal recovery, despite their potential. Here, we report a porous porphyrin polymer that captures precious metals quantitatively from PCB leachate even in the presence of 63 elements from the Periodic Table. The nanoporous polymer is synthesized in two steps from widely available monomers without the need for costly catalysts and can be scaled up without loss of activity. Through a reductive capture mechanism, gold is recovered with 10 times the theoretical limit, reaching a record 1.62 g/g. With 99% uptake taking place in the first 30 min, the metal adsorbed to the porous polymer can be desorbed rapidly and reused for repetitive batches. Density functional theory (DFT) calculations indicate that energetically favorable multinuclear-Au binding enhances adsorption as clusters, leading to rapid capture, while Pt capture remains predominantly at single porphyrin sites.

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