A novel process of extracting precious metals from waste printed circuit boards: Utilization of gold concentrate as a fluxing material

Park, Hyun Sik; Kim, Young Jae

doi:10.1016/j.jhazmat.2018.11.051

Cited by 54 publications

(18 citation statements)

References 20 publications

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“…The diverse heterogeneous constituents of PCBs facilitate selectivity and a natural hydrophobic response, thereby achieving an effective separation. The tapped density of the tailing and the concentrate was found to be around ~ 0.5 g/cm 3 and ~ 2.7 g/cm 3 , respectively. The recovery of metallic values from concentrate was observed to be ~ 72.3% with a metallic grade of ~ 92%, which consists of 77.9% Cu, 8.3% Sn, and 5.5% Pb.…”

Section: Discussionmentioning

confidence: 96%

“…3c. The tapped density for the representative sample was recorded ~ 0.45, 0.62, and 2.7 g/cm 3 for tailing 1, tailing 2, and the concentrate fraction, respectively. The substantial difference in the tapped density of different flotation products is observed, which reflects proper separation.…”

Section: Flotation Processmentioning

confidence: 99%

“…Printed circuit boards (PCBs) are an integral part of most electronic equipment and, on average, comprise 40% metals, 30% plastics, and 30% ceramics [2]. Effective utilization of waste PCBs offers tremendous recycling potential for the recovery of base metals (Cu, Ni, Fe, Sn, Pb) and precious metal (Au, Ag) values [3][4][5]. Poor recovery of the base and precious metals is a significant challenge for physical processing as they deport to the fine fraction as a by-product during size reduction.…”

Section: Introductionmentioning

confidence: 99%

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Processing of Discarded Printed Circuit Board Fines via Flotation

Barnwal

Mir

Dhawan

2020

J. Sustain. Metall.

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The recovery of metals from discarded printed circuit boards using environmentally-friendly physical routes is gaining importance. Physical separation of metal values from non-metallic constituents exploits various characteristics of crushed powder such as density, liberation, shape, size, and wettability. However, the generation of fines during grinding/crushing of the printed circuit boards is an unavoidable but essential by-product. The fine fractions are discarded due to the higher amounts of non-metallic fraction and poor separation of metallic values. In this study, the flotation process was studied to separate metallic and non-metallic values without the addition of external additives from the fine fraction of printed circuit boards (< 212 µm). The natural hydrophobic response of plastic and organic matter in fines stabilized the froth without additional reagents. The difference in tapped density for tailing (~ 0.5 g/cm 3 ) and concentrate (~ 2.7 g/cm 3 ) fraction ensures good separation. The metallic fraction increases from 14.3% in the feed to 91.7% in the concentrate. Recovery for metallic values was observed as ~ 72.3% with a purity of ~ 92% and comprised 77.9% Cu, 8.3% Sn, and 5.5% Pb.The contributing editor for this article was Veena Sahajwalla.

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Section: Discussionmentioning

confidence: 96%

Section: Flotation Processmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Processing of Discarded Printed Circuit Board Fines via Flotation

Barnwal

Mir

Dhawan

2020

J. Sustain. Metall.

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“…En la Figura 1 se ilustran los precios (USD/kg) de mercado para los metales base y los preciosos. Aunque el plástico sea cercano al 30 % o 35 % del peso del WEEE, la generación de valor de este componente es mínima debido a la heterogeneidad de los materiales que lo componen, lo que dificulta su separación y reciclaje [34]- [36].…”

Section: Minería Urbana: Reciclaje Y Aprovechamiento De Los Weeeunclassified

Revalorización de residuos de equipos eléctricos y electrónicos en Colombia: una alternativa para la obtención de metales preciosos y metales para la industria

Aristizábal-Alzate

González-Manosalva

Vargas

2021

TecnoL.

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El objetivo de este artículo es revisar el contexto mundial, y especialmente el colombiano, respecto al manejo de los residuos de equipos eléctricos y electrónicos, su aprovechamiento, recuperación y los principales métodos para la extracción de metales base y preciosos de alto valor agregado. Para ello, se realizó una revisión bibliográfica para obtener las cantidades de residuos, sus componentes principales y los métodos de extracción de metales base y preciosos; para Colombia, se realizó un estudio de caso, en el que, mediante un proceso de hidrometalurgia aplicado a teléfonos celulares, se calcularon las cantidades de metales base y preciosos que se pueden obtener. Se encontró que solo se aprovecha el 15,5 % de los residuos electrónicos en el mundo, que los principales componentes reciclables son el hierro (Fe), el cobre (Cu), el aluminio (Al), el plomo (Pb), el níquel (Ni), la plata (Ag), el oro (Au) y el paladio (Pd), y que el uso de los residuos electrónicos como fuente de metales podría reducir el consumo de energía entre 60 % y 95 %. Para el estudio de caso en Colombia, se encontró que se podrían obtener 3,8 t/año de Cu, 3,5 t/año de Fe, 56,5 kg/año de Ag, 6 kg/año de Pd y 10 kg/año de Au. Se concluye que es viable la recuperación de metales a partir de residuos eléctricos y electrónicos y que se deben buscar alternativas para aprovecharlos debido a su potencial valor agregado.

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“…Several other processes were investigated to recover metals from PCBs [6][7][8][9][10][11][12][13][14], but, considering the circular approach of the full recycling concept, even the recovery of the non-metallic fraction of PCBs was studied [10]. Debromination is a necessary treatment before any other recycling process.…”

Section: Introductionmentioning

confidence: 99%

Preliminary Study on Gold Recovery from High Grade E-Waste by Thiourea Leaching and Electrowinning

et al. 2021

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The present paper is focused on the extraction of gold from high-grade e-waste, i.e., spent electronic connectors and plates, by leaching and electrowinning. These connectors are usually made up of an alloy covered by a layer of gold; sometimes, in some of them, a plastic part is also present. The applied leaching system consisted of an acid solution of diluted sulfuric acid (0.2 mol/L) with thiourea (20 g/L) as a reagent and ferric sulfate (21.8 g/L) as an oxidant. This system was applied on three different high-grade e-waste, namely: (1) Connectors with the partial gold-plated surface (Au concentration—1139 mg/kg); (2) different types of connectors with some of which with completely gold-plated surface (Au concentration—590 mg/kg); and (3) connectors and plates with the completely gold-plated surface (Au concentration—7900 mg/kg). Gold dissolution yields of 52, 94, and 49% were achieved from the first, second, and third samples, respectively. About 95% of Au recovery was achieved after 1.5 h of electrowinning at a current efficiency of only 4.06% and current consumption of 3.02 kWh/kg of Au from the leach solution of the third sample.

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A novel process of extracting precious metals from waste printed circuit boards: Utilization of gold concentrate as a fluxing material

Cited by 54 publications

References 20 publications

Processing of Discarded Printed Circuit Board Fines via Flotation

Processing of Discarded Printed Circuit Board Fines via Flotation

Revalorización de residuos de equipos eléctricos y electrónicos en Colombia: una alternativa para la obtención de metales preciosos y metales para la industria

Preliminary Study on Gold Recovery from High Grade E-Waste by Thiourea Leaching and Electrowinning

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