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See detailEffects of operational parameters on the bio-assisted leaching of metals from pyrolyzed printed circuit boards
Arinanda, Muhammad ULiege; van Haute, Quentin; Lambert, Fanny ULiege et al

in Minerals Engineering (2019), 134

End-of-life printed circuit boards have been subjected to proprietary pyrolysis resulting in a copper-rich char. This study details their downstream processing by hydrometallurgy for copper recovery. The ... [more ▼]

End-of-life printed circuit boards have been subjected to proprietary pyrolysis resulting in a copper-rich char. This study details their downstream processing by hydrometallurgy for copper recovery. The pyrolysed PCBs were reacted with two different bioleaching solutions containing mixed mesophilic microbial consortia and a synthetic chemical solution for comparative purposes. The influence of char pre-treatment, reactor type, working temperature, and the origin of leaching solution on the dissolution of the zero valent copper was studied. It was found, that the type of reactor had a more pronounced effect than the origin of bacterial solution in bringing copper in solution. Characterisation of the leached char confirmed the importance of the pre-treatment step. Other than ferric iron concentration and temperature, the leaching effciency and kinetics were largely influenced by the bacterial activity. The fact that copper was brought into solution by ferric iron at starting concentrations well below the stoichiometric requirement, implies bacterial regeneration of the ferric iron and its cycling in the system. [less ▲]

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See detailEffects of operational parameters on the bio-assisted leaching of metals from pyrolyzed printed circuit boards
Arinanda, Muhammad ULiege; van Haute, Quentin; Lambert, Fanny ULiege et al

in Minerals Engineering (2019), 134

End-of-life printed circuit boards have been subjected to proprietary pyrolysis resulting in a copper-rich char. This study details their downstream processing by hydrometallurgy for copper recovery. The ... [more ▼]

End-of-life printed circuit boards have been subjected to proprietary pyrolysis resulting in a copper-rich char. This study details their downstream processing by hydrometallurgy for copper recovery. The pyrolysed PCBs were reacted with two different bioleaching solutions containing mixed mesophilic microbial consortia and a synthetic chemical solution for comparative purposes. The influence of char pre-treatment, reactor type, working temperature, and the origin of leaching solution on the dissolution of the zero valent copper was studied. It was found, that the type of reactor had a more pronounced effect than the origin of bacterial solution in bringing copper in solution. Characterisation of the leached char confirmed the importance of the pre-treatment step. Other than ferric iron concentration and temperature, the leaching effciency and kinetics were largely influenced by the bacterial activity. The fact that copper was brought into solution by ferric iron at starting concentrations well below the stoichiometric requirement, implies bacterial regeneration of the ferric iron and its cycling in the system. [less ▲]

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See detailPossibilities for Co(III) dissolution from an oxidized ore through simultaneous bioleaching of pyrite
Zeka, Leon; Lambert, Fanny ULiege; Frenay, Jean ULiege et al

in Minerals Engineering (2015), 75

Solubilisation of Co(III) from a heterogenite met in copper cobaltiferous oxide ore has been realized through reductive leaching using ferrous iron generated via bio-oxidation of pyrite. Biotic and ... [more ▼]

Solubilisation of Co(III) from a heterogenite met in copper cobaltiferous oxide ore has been realized through reductive leaching using ferrous iron generated via bio-oxidation of pyrite. Biotic and abiotic experiments at various pulp densities and redox potentials have been performed and results compared. Cobalt leaching at elevated redox potential is possible, offering cost reduction benefits due to reduced consumption of ferrous iron. At elevated potential of 625 mV, however, the initial rate of cobalt leaching has been found as 115 mg/(g ore)⋅(24 h), lower than the rate of 865 mg/(g ore)⋅(24 h) registered at 505 mV. Less stochiometric amount of ferrous iron was required when cobalt leaching was coupled to pyrite bioleaching, with 75% of cobalt recovered for 12 h at the optimally found conditions. It could be inferred that the Fe3+–Fe2+ cycle exists and is efficiently maintained through bacterial presence in the studied system. [less ▲]

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See detailCopper extraction from coarsely ground printed circuit boards using moderate thermophilic bacteria in a rotating-drum reactor
Rodrigues, Michael; Leão, Versiane; Gomes, Otavio et al

in Waste Management (2015), 41

The current work reports on a new approach for copper bioleaching from Printed Circuit Board (PCB) by moderate thermophiles in a rotating-drum reactor. Initially leaching of PCB was carried out in shake ... [more ▼]

The current work reports on a new approach for copper bioleaching from Printed Circuit Board (PCB) by moderate thermophiles in a rotating-drum reactor. Initially leaching of PCB was carried out in shake flasks to assess the effects of particle size ( 208 lm + 147 lm), ferrous iron concentration (1.25–10.0 g/L) and pH (1.5–2.5) on copper leaching using mesophile and moderate thermophile microorganisms. Only at a relatively low solid content (10.0 g/L) complete copper extraction was achieved from the particle size investigated. Conversely, high copper extractions were possible from coarse-ground PCB (20 mm-long) working with increased solids concentration (up to 25.0 g/L). Because there was as the faster leaching kinetics at 50 C Sulfobacillus thermosulfidooxidans was selected for experiments in a rotating-drum reactor with the coarser-sized PCB sheets. Under optimal conditions, copper extraction reached 85%, in 8 days and microscopic observations by SEM–EDS of the on nonleached and leached material suggested that metal dissolution from the internal layers was restricted by the fact that metal surface was not entirely available and accessible for the solution in the case of the 20 mm-size sheets. [less ▲]

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See detailCOPPER LEACHING FROM WASTE ELECTRIC CABLES BY BIOHYDROMETALLURGY
Lambert, Fanny ULiege; Bastin, David ULiege; Gaydardzhiev, Stoyan ULiege et al

in Minerals Engineering (2015)

This study examines the leaching of copper from waste electric cables by chemical leaching and leaching catalysed by Acidithiobacillus ferrooxidans in terms of leaching kinetics and reagents consumption ... [more ▼]

This study examines the leaching of copper from waste electric cables by chemical leaching and leaching catalysed by Acidithiobacillus ferrooxidans in terms of leaching kinetics and reagents consumption. Operational parameters such as the nature of the oxidant (Fe3+, O2), the initial ferric iron concentration (0-10 g/L) and the temperature (21-50°C) were identified to have an important influence on the degree of copper solubilisation. At optimal process conditions, copper extraction above 90% was achieved in both leaching systems, with a leaching duration of 1 day. The bacterial leaching system slightly outperformed the chemical one but the positive effect of regeneration of Fe3+ was limited. It appears that the Fe2+ bio-oxidation is not sufficiently optimised. Best results in terms of copper solubilisation kinetics were obtained for the abiotic test at 50°C and for the biotic test at 35°C. Moreover, the study showed that in same operating conditions, a lower acid consumption was recorded for the biotic test than for the abiotic test. [less ▲]

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See detailCopper recovery from waste electric cables by biohydrometallurgy
Lambert, Fanny ULiege; Bastin, David ULiege

Conference (2014, June 13)

This study examines the leaching of copper from waste electric cables by chemical leaching and leaching catalysed by Acidithiobacillus ferrooxidans in terms of leaching kinetics and reagents consumption ... [more ▼]

This study examines the leaching of copper from waste electric cables by chemical leaching and leaching catalysed by Acidithiobacillus ferrooxidans in terms of leaching kinetics and reagents consumption. Operational parameters such as the nature of the oxidant (Fe3+, O2), the initial ferric iron concentration (0-10 g/L) and the temperature (21-50°C) were identified to have an important influence on the degree of copper solubilisation. At optimal process conditions, copper extraction above 90% was achieved in both leaching systems, with a leaching duration of 1 day. The bacterial leaching system slightly outperformed the chemical one but the positive effect of regeneration of Fe3+ was limited. It appears that the Fe2+ bio-oxidation is not sufficiently optimised. Best results in terms of copper solubilisation kinetics were obtained for the abiotic test at 50°C and for the biotic test at 35°C. Moreover, the study showed that in same operating conditions, a lower acid consumption was recorded for the biotic test than for the abiotic test. [less ▲]

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See detailLa ruée vers l'or technologique
Lambert, Fanny ULiege

Conference given outside the academic context (2014)

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See detailBiohydrometallurgy, a key for recyclng crtical metals?
Lambert, Fanny ULiege

Conference (2013, December)

In Europe, recycling of end-of-life consumer goods appears as a strategy to secure raw materials supply and to preserve resources. Industrial processes exist to recycle a large number of metals (ferrous ... [more ▼]

In Europe, recycling of end-of-life consumer goods appears as a strategy to secure raw materials supply and to preserve resources. Industrial processes exist to recycle a large number of metals (ferrous metals, base metals and precious metals) but high technology metals, as some of the fourteen metals listed as critic in Europe, are currently not recycled from post-consuming applications. The PhD project focuses on the recycling of these high technology metals by an innovative process based on bio-hydrometallurgy. The main objective is the study of the possibility (technique and economic) to recover gallium from printed circuit boards. [less ▲]

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See detailThe bioleaching as a recycling process of polymetallic wastes
Lambert, Fanny ULiege

Conference (2011, January)

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See detailGetting more out of end-of-life vehicles: a bio hydrometallurgical approach
Lewis, Grégory ULiege; Lambert, Fanny ULiege

Conference (2010, November 09)

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See detailApplication de la biométallurgie dans le traitement des DEEE
Lambert, Fanny ULiege

Master's dissertation (2010)

The aim of this study is first to improve the comprehension of leaching and bioleaching processes in waste recycling – electric cables refuse mainly – and then to prove their feasibility. More ... [more ▼]

The aim of this study is first to improve the comprehension of leaching and bioleaching processes in waste recycling – electric cables refuse mainly – and then to prove their feasibility. More specifically, this study provides a comparison between the two technologies to highlight their respective advantages and disadvantages in order to determine the one that could be developed on an industrial scale. Different leaching and bioleaching tests where realized in the laboratory of the University of Liege. The sample used was the mechanical treatment refuse of electric cables supplied by the organism ARN, in the Netherlands. In addition to show the most suitable process for an industrial treatment, these tests’ aim was to determine the optimal parameters to solve copper (temperature, ferric iron concentration, bacteria). Some tests also develop the possibility to save reagents thanks to the use of pyrite as iron and sulphuric acid producer. The different tests performances were judged on several parameters: lixiviation rate, sulphuric acid consumption and lixiviation efficiency. These parameters allow clearing up the respective advantages and disadvantages of each process. They also determine optimal temperature and oxidant concentration. A total and quick copper dissolution is interesting, of course, but other elements are important too. The plastics degradation, due to the presence of acid, can hinder the plastics recycling process. Furthermore, this document proposes a bibliographical review in which current WEEE recycling processes are developed. Some information about the different bacteria used are given as well. Afterwards, the different tests and their results are presented in detail. They are followed by a general discussion that summarizes the main concepts mentioned in this thesis and is illustrated by an outline of several industrial flowsheets. [less ▲]

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