Sustainability of metal recovery from E-waste

Debnath, Biswajit; Chowdhury, Ranjana; Ghosh, Sadhan Kumar

doi:10.1007/s11783-018-1044-9

Cited by 111 publications

(49 citation statements)

References 44 publications

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“…The metal recovery technique enables the recovery or extraction of various valuable/heavy metals from waste materials through different industrial or laboratory methods. [48] With diminishing natural resources, the demand for the recovery of precious metals from alternative sources has increased. As several waste materials are composed of different heavy metals, concerns over the extraction of valuable metals with more efficient methods has attracted the attention of researchers.…”

Section: Metal Extractionmentioning

confidence: 99%

Characterization, Processing, and Application of Heavy Fuel Oil Ash, an Industrial Waste Material – A Review

Basha

Aziz

Maslehuddin

et al. 2020

The Chemical Record

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Heavy fuel oil ash (HFOA) is generated as an industrial waste material during the combustion of heavy fuel oil in power/desalination plants. With increasing energy demands, a significant volume of HFOA is generated. It is generally disposed of in landfills, causing environmental pollution, as it contains several toxic elements. Recently, efforts were made towards developing strategies for reusing industrial waste materials and creating value-added products from the waste materials. Despite significant information available in the literature on the utilization of HFOA, there is still a need for a thorough and systematic review on the characterization and utilization of HFOA in various applications. Consequently, this paper aims to present a critical review of the literature on HFOA generation, its chemical composition, physical properties, morphology, and applications. It is encouraging to note that HFOA has been used in several potential applications, such as the preparation of activated carbon and carbon nanotubes, metal recovery, environmental pollutant removal, polymer composites and construction materials, etc. However, the development of several value-added materials utilizing HFOA and its applications in other areas such as coatings, cathodic protection systems, and phase change materialswould emerge as a new topic of research. It is expected that this review will act as a precursor for further research on the use of HFOA in industrial applications. Since the use of HFOA will lead to environmental, economic, and technical benefits, research in the utilization of this industrial waste material is highly recommended.

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Section: Metal Extractionmentioning

confidence: 99%

Characterization, Processing, and Application of Heavy Fuel Oil Ash, an Industrial Waste Material – A Review

Basha

Aziz

Maslehuddin

et al. 2020

The Chemical Record

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“…13 Hence, considerable efforts have been made to develop the environmentally-friendly biotechnological processing of e-waste. 14 Besides the use of lesshazardous biogenic lixiviants in a cost-effective manner, the operational flexibility, lower energy consumption, and selectivity towards individual metals are potential advantages to applying bioleaching techniques into e-waste recycling. A pictorial representation, revealing the advantages of e-waste recycling in terms of a biotechnological-driven process, is shown in Fig.…”

Section: Introductionmentioning

confidence: 99%

Biotechnological recycling of critical metals from waste printed circuit boards

Srivastava

Ilyas

Kim

et al. 2020

J of Chemical Tech & Biotech

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Critical metals are key raw materials for new generation clean energy production. The extraction of critical metals often follows the difficult processing of primary ores and they are many times recovered as the companion metals. With the depletion of primary reserves, the focus has now shifted to processing the urban mines, like electronic (e-)waste. Among the different types of e-waste, the waste printed circuit boards (WPCBs) are the major reservoir of high-value critical metals and are usually treated by the traditional pyro-and/or hydro-metallurgical techniques. However, the application of microbial activities in metals recycling is rapidly emerging as a green technology in comparison to smelter or chemical processing. The application of microorganisms (bacteria/fungi) in WPCBs' recycling is being increasingly explored in order to meet the parallel objectives of resource recovery and pollution mitigation. Therefore, the present article assesses the current frontiers in bioleaching of critical metals from WPCBs and contains discussions on process fundamentals, challenges, and perspectives. The applicability of microbial recycling of WPCBs at a higher scale in terms of a circular economy and urban mining notion, the techno-economic analysis, and environmental sustainability in comparison to the chemical processing route are also discussed.

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“…As such, it is evident that there is a need to develop more sustainable processes which can not only efficiently recycle tantalum from secondary sources but do so using milder reagents [12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

“…[8][9][10][11]. As such, it is evident that there is a need to develop more sustainable processes which can not only efficiently recycle tantalum from secondary sources but do so using milder reagents [12][13][14][15]. Recent efforts towards fluoride-free tantalum recovery processes have focused on alkaline matrices to generate polyoxotantalates that are recovered at elevated temperatures by solvent extraction [16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Tantalum Recycling by Solvent Extraction: Chloride Is Better than Fluoride

Kinsman

Crevecoeur

Singh-Morgan

et al. 2020

Metals

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The recycling of tantalum (Ta) is becoming increasingly important due to the criticality of its supply from a conflict mineral. It is used extensively in modern electronics, such as in capacitors, and so electronic waste is a potentially valuable secondary source of this metal. However, the recycling of Ta is difficult, not least because of the challenges of its leaching and subsequent separation from other metals. In this work, we show that Ta(V) halides, such as TaCl5 and TaF5, which can potentially be accessed from Ta metal upon acid halide leaching, can be recovered by solvent extraction using a simple primary amide reagent. The need for high halide concentrations in the aqueous phase implies the formation of the hexahalide salts [TaX6]− (X = F, Cl) and that an anion-swing mechanism operates. While extraction of the fluorides is poor (up to 45%), excellent extraction under chloride conditions is found (>99%) and presents an alternative route to Ta recycling.

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Sustainability of metal recovery from E-waste

Cited by 111 publications

References 44 publications

Characterization, Processing, and Application of Heavy Fuel Oil Ash, an Industrial Waste Material – A Review

Characterization, Processing, and Application of Heavy Fuel Oil Ash, an Industrial Waste Material – A Review

Biotechnological recycling of critical metals from waste printed circuit boards

Tantalum Recycling by Solvent Extraction: Chloride Is Better than Fluoride

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