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

Waste electrical and electronic equipment (WEEE) generation is a global problem. Despite the growing awareness and deterring legislation, most of the WEEE is disposed improperly, i.e. landfilled or otherwise shipped overseas, and treated in sub-standard conditions. Les mer
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Legg i
Vår pris: 1350,-

(Paperback) Fri frakt!
Leveringstid: Sendes innen 21 dager
På grunn av Brexit-tilpasninger og tiltak for å begrense covid-19 kan det dessverre oppstå forsinket levering.

Om boka

Waste electrical and electronic equipment (WEEE) generation is a global problem. Despite the growing awareness and deterring legislation, most of the WEEE is disposed improperly, i.e. landfilled or otherwise shipped overseas, and treated in sub-standard conditions. Informal recycling of WEEE has catastrophic effects on humans and the environment. WEEE contains considerable quantities of valuable metals such as base metals, precious metals and rare earth elements (REE). Metal recovery from WEEE is conventionally carried out by pyrometallurgical and hydrometallurgical methods.


In this PhD research, novel metal recovery technologies from WEEE are investigated. Using acidophilic and cyanide-generating bacteria, copper and gold were removed from crushed electronic waste with removal efficiencies of 98.4 and 44.0%, respectively. The leached metals in solution were recovered using sulfidic precipitation and electrowinning separation techniques. Finally, a techno-economic assessment of the technology was studied. This research addresses the knowledge gap on two metal extraction approaches, namely chemical and biological, from a secondary source of metals. The essential parameters of the selective metal recovery processes, scale-up potential, techno-economic and sustainability assessment have been studied.

Fakta

Innholdsfortegnelse

Introduction
1.1 Introduction
1.2 Research goals and questions
1.3 Research approach and methodology
1.4 Structure of this dissertation


2 Electronic waste as a secondary source of metals, its management and recovery technologies
Abstract
2.1 Introduction
2.2 Global and regional WEEE generation
2.3 Waste as a secondary resource in transition to a circular economy
2.4 Improper management of WEEE
2.5 Transboundary movement of WEEE
2.6 Metals in WEEE
2.7 Metal recovery from WEEE
2.8 Physical pretreatment of WEEE
2.9 Treatment and refining of WEEE
2.10 Conclusions and perspectives


3 Biorecovery of metals from electronic waste - A review
Abstract
3.1 Introduction
3.2 Microbial mobilization of metals from electronic waste
3.3 Biorecovery of metals
3.4 Conclusions


4 Characterization of discarded printed circuit boards and a multi-criteria analysis approach for metal recovery technology selection
Abstract
4.1 Introduction
4.2 Methodology
4.3 Results
4.4 Discussion
4.5 Conclusions


5 Bioleaching of copper and gold from discarded printed circuit boards
Abstract
5.1 Introduction
5.2 Materials and methods
5.3 Results
5.4 Discussion
5.5 Conclusions


6 Two-step leaching of valuable metals from discarded printed circuit boards, process kinetics, and optimization using response surface methodology
Abstract
6.1 Introduction
6.2 Materials and methods
6.3 Results
6.4 Leaching of copper in oxidative medium
6.5 Leaching of gold in ammoniacal thiosulfate medium
6.6 Discussion
6.7 Conclusions


7 Selective recovery of copper from the leachate solution by sulfide precipitation and electrowinning
Abstract
7.1 Introduction
7.2 Materials and methods
7.3 Results
7.4 Discussion
7.5 Conclusions


8 Techno-economic assessment and environmental sustainability analysis of a newly developed metal recovery technology
Abstract
8.1 Introduction
8.2 Methodology
8.3 Sustainability assessment of the newly developed technology
8.4 Techno-economic assessment of the processes
8.5 Results
8.6 Conclusions


9 General discussion and conclusions
9.1 Introduction
9.2 Motivation for metal recovery from WEEE
9.3 Electronic waste as a secondary source of metals
9.4 Metal extraction from the discarded PCB
9.5 Recovery: electrowinning versus sulfidic precipitation
9.6 Techno-economic assessment and environmental sustainability analysis of an emerging technology at an early stage of development
9.7 Strategies for the development of a sustainable technology to recover metals from electronic waste
9.8 Overall conclusions


References