Effect of ionic liquid [MIm]HSO4 on WPCB metal-enriched scraps refined by slurry electrolysis

Qi, Yaping; Yi, Xiaoxia; Zhang, Yugai; Meng, Fansong; Shu, Jiancheng; Xiu, Fu-Rong; Sun, Zhi; Sun, Shuhui; Chen, Mengjun

doi:10.1007/s11356-019-06337-x

Cited by 23 publications

(8 citation statements)

References 38 publications

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“…As it can be observed, ionic liquids are mainly used to replace aqueous environments in order to enhance the recovery percentage of high value-added metals, as gold, palladium, copper or platinum and increasing current efficiency. In general terms, using a certain percentage of ILs enhances the recovery of the target metal and allows obtaining this metal as a power of a controlled size or morphology [ 37 , 38 , 39 , 40 ], including some works regarding the formation of metal nanotubes [ 41 ]. It is also common to observe that the metal recovery does not improve when the concentration of the IL increases above a given threshold.…”

Section: Use Of Ionic Liquids In Electrodepositionmentioning

confidence: 99%

“…The use of ILs not only improves the recovery and morphology of the target metal, but also increases the percentage of metal extracted from mineral ores or from electronic waste as waste printed circuits or used mobile phones [ 37 , 38 , 42 ]. In this line, an approach has been done when using mixtures of ILs to prepare a deep eutectic solvent mixture, which can be used to efficiently extract metals from mineral power and further recover them by electrodeposition [ 43 ].…”

Section: Use Of Ionic Liquids In Electrodepositionmentioning

confidence: 99%

“… For 80% H 2 SO 4 replaced: total metal recovery: 85%; purity: 89%; current efficiency: 52%; particle size of cathode metal powder; 3.77 μm. [ 38 ] To study copper leaching from waste mobile phones with different ILs and evaluate the influence of several operational variables. Waste printed circuit boards (PCBs): 83.31% Cu; 3.35% Fe; 12.44% Zn.…”

Section: Use Of Ionic Liquids In Electrodepositionmentioning

confidence: 99%

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An Old Technique with A Promising Future: Recent Advances in the Use of Electrodeposition for Metal Recovery

Delgado¹,

Fernández-Morales²,

Llanos³

2021

Molecules

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Although the first published works on electrodeposition dates from more than one century ago (1905), the uses of this technique in the recovery of metals are attracting an increasing interest from the scientific community in the recent years. Moreover, the intense use of metals in electronics and the necessity to assure a second life of these devices in a context of circular economy, have increased the interest of the scientific community on electrodeposition, with almost 3000 works published per year nowadays. In this review, we aim to revise the most relevant and recent publications in the application of electrodeposition for metal recovery. These contributions have been classified into four main groups of approaches: (1) treatment and reuse of wastewater; (2) use of ionic liquids; (3) use of bio-electrochemical processes (microbial fuel cells and microbial electrolysis cells) and (4) integration of electrodeposition with other processes (bioleaching, adsorption, membrane processes, etc.). This would increase the awareness about the importance of the technology and would serve as a starting point for anyone that aims to start working in the field.

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Section: Use Of Ionic Liquids In Electrodepositionmentioning

confidence: 99%

Section: Use Of Ionic Liquids In Electrodepositionmentioning

confidence: 99%

Section: Use Of Ionic Liquids In Electrodepositionmentioning

confidence: 99%

See 1 more Smart Citation

An Old Technique with A Promising Future: Recent Advances in the Use of Electrodeposition for Metal Recovery

Delgado¹,

Fernández-Morales²,

Llanos³

2021

Molecules

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“…In addition, microwave irradiation consumes less energy and can produce a larger crushing and lifting effect in a shorter irradiation time, which can greatly save energy compared to the traditional heat-assisted crushing method, and has certain economic benefits. 35 The study has important implications for microwave-assisted metal extraction from WPCB.…”

Section: Introductionmentioning

confidence: 99%

Effect of Microwave Pretreatment on the Leaching and Enrichment Effect of Copper in Waste Printed Circuit Boards

Huang

et al. 2023

ACS Omega

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The use of efficient and clean methods for the recycling of waste circuit boards is an ongoing challenge. In this research, the effect of microwave pretreatment on the leaching and enrichment of copper from waste print circuit board (WPCB) was studied. The morphology and chemical structure of WPCB particles before and after microwave pretreatment were analyzed by SEM/EDS and Fourier infrared spectroscopy. Leaching experiments and copper enrichment tests were designed to investigate the effect of different microwave irradiation powers and microwave irradiation times on the copper leaching rate and copper enrichment rate in WPCB. The leaching experiment results showed that microwave pretreatment can effectively improve the leaching rate of WPCB. When the microwave irradiation power was 700 W, the irradiation time was 120 s, and the leaching time was 15 min, the copper leaching rate in WPCB was 57.01%, which was 24.34% higher than that in the untreated condition. The results of copper enrichment experiment show that microwave pretreatment can effectively improve the copper enrichment of WPCB. After microwave pretreatment, copper was effectively enriched in the 4–2 and 2–1 mm particle sizes. When the microwave irradiation time was 120 s, the copper enrichment rates in the 4–2 and 2–1 mm particle sizes were 1.74 and 1.66, which increased by 0.63 and 0.32, respectively, compared to the untreated condition. Microwave pretreatment enables the effective separation of metallic copper from non-metallic components in WPCB, increasing the exposure area of copper and promoting the monomer separation of copper, thus improving the leaching and enrichment of copper.

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“…During the past few years, our research group successfully used an acidic slurry electrolysis system, which combines leaching, electrolyte purification, and electrowinning in one device, to recycle copper from WPCB powders by one step. ,− These results showed that the separation rate of metal was more than 98%, and no nonmetal was included in the metal; micron and nanometer copper powders with different particle sizes, morphologies (spherical, dendritic), and crystals (single-crystal copper, Cu 2+1 O/Cu composite) can be prepared from WPCBs by controlling the process parameters. , Simultaneously, as mentioned previously, the content of precious metals, such as gold in WPCBs, is much higher than their common ores . Therefore, it is essential to recycle precious metals such as Au simultaneously with copper.…”

Section: Introductionmentioning

confidence: 99%

Gold Fractal Growth during Its Recycling from Waste Printed Circuit Boards by Slurry Electrolysis

Wang

Zeng

et al. 2022

ACS Sustainable Chem. Eng.

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Waste printed circuit boards, especially from mobile phones, possess an extremely higher resource value. The key to current electronic waste disposal is to efficiently recycle valuable and precious metals under the condition of ensuring its environmental friendliness. Slurry electrolysis has been identified to be an effective method to recover valuable and precious metals from waste printed circuit boards. Meanwhile, copper fractal growth causes higher energy consumption during this process and has been extensively investigated. However, the mechanism of precious metal fractal growth, especially gold, is still unclear. In this work, the factors that impact two-dimensional gold dendritic patterns are discussed in detail. These results indicate that increasing the applied voltage and chloroauric acid and hydrochloric acid concentrations could increase the probability of particle movement, which would enter the inner growing point due to the reduction of the tip shielding effect, further resulting in an increase in the fractal dimension. Additives, trisodium citrate and poly(vinylpyrrolidone) (PVP), can inhibit fractal growth to a certain extent by varying surface chemical properties. The minimum fractal dimension is 1.742 under the conditions of 0.12 mol/L chloroauric acid, 0.25 mol/L hydrochloric acid, 80 mg/L PVP, and 25 V. The diffusion-limited aggregation simulation result is consistent with the gold fractal growth experiment under the condition that the electrocrystallization time is significantly less than that of diffusion. The Materials Studio simulation result indicates that additives, PVP in particular, which provide particles with unique hydrogen bonding and steric hindrance, can promote the growth of gold atoms on crystal planes, especially the (111) crystal planes. Based on the results of fractal growth, the addition of 160 mg/L trisodium citrate and PVP to a slurry electrolysis recovery system of WPCB-MPs significantly increases the gold recovery rate and the current efficiency from 31.5, 0.2% to 77.9, 1.7% and 66.0, 2.2%, respectively. These results are conducive to further enriching the theory and enhancing the recovery of precious metals from e-waste by slurry electrolysis.

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Effect of ionic liquid [MIm]HSO4 on WPCB metal-enriched scraps refined by slurry electrolysis

Cited by 23 publications

References 38 publications

An Old Technique with A Promising Future: Recent Advances in the Use of Electrodeposition for Metal Recovery

An Old Technique with A Promising Future: Recent Advances in the Use of Electrodeposition for Metal Recovery

Effect of Microwave Pretreatment on the Leaching and Enrichment Effect of Copper in Waste Printed Circuit Boards

Gold Fractal Growth during Its Recycling from Waste Printed Circuit Boards by Slurry Electrolysis

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