Metal Recovery from Electronic Waste: Biological Versus Chemical Leaching for Recovery of Copper and Gold

2018 ◽  
Author(s):  
Arda Işildar
Keyword(s):  
Electronic Waste ◽  
Metal Recovery ◽  
Chemical Leaching

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.

scholarly journals ASSESSMENT OF METAL RECOVERY FROM RAW SPENT HYDRODESULFURIZATION CATALYST THROUGH BIOLEACHING AND CHEMICAL LEACHING

2016 ◽  
Vol 9 (4) ◽  
pp. 137-145 ◽  
Author(s):  
P. F. Ferreira ◽  
E. F. C. Sérvulo ◽  
D. M. Ferreira ◽  
F. J. S. Oliveira
Keyword(s):  
Metal Recovery ◽  
Chemical Leaching

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

scholarly journals Uptake and Recovery of Gold from Simulated Hydrometallurgical Liquors by Adsorption on Pine Bark Tannin Resin

Water ◽  
2020 ◽  
Vol 12 (12) ◽  
pp. 3456
Author(s):  
Maria Beatriz Q. L. F. Torrinha ◽  
Hugo A. M. Bacelo ◽  
Sílvia C. R. Santos ◽  
Rui A. R. Boaventura ◽  
Cidália M. S. Botelho
Keyword(s):  
Electronic Waste ◽  
Precious Metals ◽  
Selective Extraction ◽  
Pine Bark ◽  
Future Research ◽  
Aqua Regia ◽  
Chemical Leaching ◽  
Thiourea Solution ◽  
Pseudo Second Order ◽  
Adsorption Desorption

The recovery of critical and precious metals from waste electrical and electronic equipment (WEEE) is an environmental and economic imperative. Biosorption has been considered a key technology for the selective extraction of gold from hydrometallurgical liquors obtained in the chemical leaching of e-waste. In this work, the potential of tannin resins prepared from Pinus pinaster bark to sequester and recover gold(III) from hydrochloric acid and aqua regia solutions was assessed. Equilibrium isotherms were experimentally determined and maximum adsorption capacities of 343 ± 38 and 270 ± 19 mg g−1 were found for Au uptake from HCl and HCl/HNO3 (3:1 v/v) solutions containing 1.0 mol L−1 H+. Higher levels of acidity (and chloride ligands) significantly impaired the adsorption of gold from both kinds of leaching solutions, especially in the aqua regia system, in which the adsorbent underperformed. Pseudo-first and pseudo-second order models successfully described the kinetic data. The adsorbent presented high selectivity towards gold. Actually, in simulated aqua regia WEEE liquors, Au(III) was extensively adsorbed, compared to Cu(II), Fe(III), Ni(II), Pd(II), and Zn(II). In three adsorption–desorption cycles, the adsorption capacity of the regenerated adsorbent moderately decreased (19%), although the gold elution in acidic thiourea solution had been quite limited. Future research is needed to examine more closely the elution of gold from the exhausted adsorbents. The results obtained in this work show good perspectives as regards the application of pine bark tannin resins for the selective extraction of Au from electronic waste leach liquors.

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.

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