Electrochemical extraction of tin and copper from acid leachate of printed circuit boards using copper electrodes

Silva, Maria S. B. da; Melo, Rafael Leandro Fernandes; Moriyama, André Luís Lopes; Souza, Carlson Pereira de

doi:10.1016/j.jenvman.2019.06.009

Cited by 14 publications

(7 citation statements)

References 18 publications

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“…According to this process, the following products are obtained: two leach solutions enriched in copper (148 g of copper in the first and 70 g of copper in the second are dissolved) and a leach solution in which 347 mg of gold are dissolved. Copper and gold can be recovered by electrodeposition [ 31 ].…”

Section: Discussionmentioning

confidence: 99%

Effect of Acid Leaching Pre-Treatment on Gold Extraction from Printed Circuit Boards of Spent Mobile Phones

et al. 2021

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The effect of a preliminary acid leaching for the recovery of gold by thiourea from printed circuit boards (PCBs) of spent mobile phones, was investigated. Preliminary leaching is aimed to recover copper in the leachate that would compete with gold in the successive leaching of the residue with thiourea, thus preventing the formation of the gold-thiourea complex. Two hydrometallurgical routes were tested for the recovery of copper first, and gold after. The first one was based on a two-step leaching that utilizes sulfuric acid and hydrogen peroxide in the preliminary leaching and then thiourea for the recovery of gold in the successive leaching: A copper and gold recovery of 81% and 79% were obtained, respectively. In the second route, nitric acid was used: 100% of copper was recovered in the leachate and 85% of gold in the thiourea successive leaching. The main operative parameters, namely thiourea and ferric sulphate concentrations, leach time, liquid-solid ratio, and temperature were studied according to a factorial plan strategy. A flowsheet of the processes was proposed, and a mass balance of both routes was obtained. Finally, qualitative considerations on the technical and economic feasibility of the different routes were made.

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Section: Discussionmentioning

confidence: 99%

Effect of Acid Leaching Pre-Treatment on Gold Extraction from Printed Circuit Boards of Spent Mobile Phones

et al. 2021

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“…The efficiency of hydrometallurgical e-waste recovery is reported to be very high, ranging between 82% and 100% [51]; for instance, leaching through thermal transformation to recover metallic materials from PCBs can lead to recovery efficiencies of up to 93.56%, 65.07%, 92%, and 95.52%, respectively, for Cu, Zn, Pb, and Sn [55]. The other reported example is the room temperature recovery of Sn from PCBs through the hydrometallurgical route followed by electrodeposition which leads to a 100% recovery rate after just two hours of treatment [56]. In hydrometallurgical processes, the targeted metal should be properly leached into solutions of desired concentration involving mostly acids, such as hydrochloric acid, nitric acids, strong sulfuric acids, aqua regia, and a few alkalis.…”

Section: Hydrometallurgical Approachesmentioning

confidence: 99%

“…The produced ZnO NPs, having high commercial value and fluorescent nature, are highly qualified and interesting for photocatalytic, sensors, biology, and solar cell applications. Additionally, the separated pure MnO2 product can be re-utilized in various applications [56]. The used one-pot leachingcombustion process is very advantageous due to its single-step process without any need to perform a multiple-processing route (e.g., separate leaching, extraction, and combustion steps).…”

Section: Zno-based Materialsmentioning

confidence: 99%

Photocatalytic Materials Obtained from E-Waste Recycling: Review, Techniques, Critique, and Update

Bahadoran

Lile

Masudy‐Panah

et al. 2022

JMMP

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Waste-derived materials obtained from the recovery and recycling of electronic waste (e-waste) such as batteries and printed circuit boards have attracted enormous attention from academia and industry in recent years, especially due to their eco-friendly nature and the massive increment in e-waste due to technological development. Several investigations in the literature have covered the advances achieved so far. Meanwhile, photocatalytic applications are especially of interest since they maintain mutual benefits and can be used for H2 production from solar water splitting based on semiconductor processing as a proper environmentally friendly technique for solar energy conversion. In addition, they can be utilized to degrade a variety of organic and non-organic contaminations. Nonetheless, to the best of the authors’ knowledge, there has not been any comprehensive review that has specifically been focused on e-waste-derived photocatalytic materials. In this regard, the present work is dedicated to thoroughly discussing the related mechanisms, strategies, and methods, as well as the various possible photocatalysts synthesized from e-wastes with some critiques in this field. This brief overview can introduce modern technologies and promising possibilities for e-waste valorization, photocatalytic processes, and new photocatalytic degradation methods of eco-friendly nature. This paper discusses various e-waste-obtained photocatalytic materials, synthesis procedures, and applications, as well as several types of e-waste, derived materials such as TiO2, ZnO, indium tin oxide, and a variety of sulfide- and ferrite-based photocatalytic materials.

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“…Furthermore, there are plenty of review articles published to summarize all these studies [6]. Heavy metals are currently removed using electrochemical [7], electrocoagulation and precipitation [8], electrodeposition [9], ion exchange [10,11], thermal and mechanical-chemical processes [12], membrane [6] and phytoremediation [13]. There are various wastewater treatments available,each has its advantages and disadvantages, especially in terms of capacity, efficiency, costs, feasibility, and environmental impact.…”

Section: Introductionmentioning

confidence: 99%

Novel high capacity model for copper binary ion exchange on e-waste derived adsorbent resin

et al. 2022

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Heavy metal water pollution is a global concern in recent years. Copper is a toxic metal at higher concentrations (> 20 μg /g) and needs to be removed using ion exchanger systems. This study investigates the removal efficiencies of copper by the non-metallic fraction (NMF) waste printed circuit boards (PCBs). The high maximum adsorption capacity of copper by the PCB-derived material after activation with KOH was 2.65 mmol/g, and the experimental isotherm was best correlated by the Temkin model. Finally, this study presents a novel dual site adsorption/ion exchange mechanism, wherein the potassium (from the activation) and calcium (present in the structure) served as ion exchange sites for the copper in the solution. Therefore, this recycling study, focusing on cyclic environmental management, converts a major waste material to an activated ion exchange resin (high capacity) for the removal of copper from wastewater solutions and successfully regenerates the resin for re-use while producing an acidic copper solution for recovery by electrolysius or chemical salt precipitation.

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Electrochemical extraction of tin and copper from acid leachate of printed circuit boards using copper electrodes

Cited by 14 publications

References 18 publications

Effect of Acid Leaching Pre-Treatment on Gold Extraction from Printed Circuit Boards of Spent Mobile Phones

Effect of Acid Leaching Pre-Treatment on Gold Extraction from Printed Circuit Boards of Spent Mobile Phones

Photocatalytic Materials Obtained from E-Waste Recycling: Review, Techniques, Critique, and Update

Novel high capacity model for copper binary ion exchange on e-waste derived adsorbent resin

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