Current Status on Leaching Precious Metals from Waste Printed Circuit Boards

Zhang, Yanhua; Liu, Shili; Xie, Henghua; Zeng, Xianlai; Li, Jinhui

doi:10.1016/j.proenv.2012.10.077

Cited by 153 publications

(93 citation statements)

References 13 publications

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“…Viewed from the different perspectives of the recycling of PCBs, scientists have developed many and varied methods involving physical and mechanical technology for separation, bio-technology, supercritical fluid technology, microwave treatment and processes of extractive metallurgy (hydro and pyrometallurgy). Despite the existence of these routes, the processing of "mechanical crushing + hydrometallurgy" is the more predominant technology and the most commonly used, because of the advantages reached in the recycling of PCBs [10,15,16].…”

Section: Introductionmentioning

confidence: 99%

Urban Mining and Electrochemistry: Cyclic Voltammetry Study of Acidic Solutions from Electronic Wastes (Printed Circuit Boards) for Recovery of Cu, Zn, and Ni

Reyes-Valderrama

Salinas‐Rodríguez

Montiel‐Hernández

et al. 2017

Metals

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Abstract:We report potentiodynamic studies to characterize copper, nickel and zinc leaching solutions from electronic waste. The metals were leached using oxygen and sulfuric acid (pH = 1.5). As is known, reduction potentials are determined using thermodynamics laws, and metal recovery strategies from electronic waste are usually considered according these thermodynamic values. Pourbaix-type diagrams are not appropriate to plan strategies in electrochemical processing. Therefore, knowledge of electrode potentials for the metal deposit/dissolution process is the basis for the selective recovery planning. For this reason, potentiodynamic studies, specifically cyclic voltammetry, are revealed as a good way to decide the best conditions for the process of electrochemical recovery of metals from electronic waste, which is also cost-efficient and has no interference from strange ions, such as lead, in this case.

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Section: Introductionmentioning

confidence: 99%

Urban Mining and Electrochemistry: Cyclic Voltammetry Study of Acidic Solutions from Electronic Wastes (Printed Circuit Boards) for Recovery of Cu, Zn, and Ni

Reyes-Valderrama

Salinas‐Rodríguez

Montiel‐Hernández

et al. 2017

Metals

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“…However, the high degree of toxicity of these compounds, both to workers and to the environment, has led researchers to study leaching processes that do not use cyanide as leaching agent. Among these leaching processes, leaching with thiourea, thiosulfate and halide have been studied [95].…”

Section: Hydrometallurgical Processingmentioning

confidence: 99%

Electronic Waste Recycling

et al. 2015

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“…The Br 2 based lixiviants can be also used, but some authors suggest that these are unattractive due to the high vapor pressure of Br 2 (ex. 28 kPa at 35 o C) [21]. Contrarily, other researchers indicate that the use of the adequate complexing agents like bromide or organic ammonium perhalides can resolve this problem [22].…”

Section: Introductionmentioning

confidence: 99%

Electrochemical recycling of waste printed circuit boards in bromide media. Part I: preliminary leaching and dismantling tests

Dorneanu¹

2017

Studia UBB Chemia

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ABSTRACT. In the context of the large and increasing interest for an efficient and ecological recycling of the Waste Electrical and Electronic Equipments (WEEEs), we decide to evaluate the feasibility of an electrochemical recycling process for waste printed circuit boards (WPCBs) based on bromine-bromide leaching system. For this preliminary study, a perforated rotating drum chemical reactor (RDCR), interconnected with a divided electrochemical reactor (DER) in a closed hydraulic loop, was successfully used to dismantle consecutively three computer motherboards (CMB) after a minimal mechanical pre-treatment. Essentially, the base metals were leached at the RDCR level and the bromine-bromide system was regenerated at the DER level, simultaneously with the partial electrodeposition of dissolved metals. Even if the operating parameters were not optimized, each CMB was completely dismantled in around 18 h, with cathodic and anodic mean current efficiencies of 43.6% and 58.4%, respectively. Notably, grace to the proposed process, the remaining undissolved parts (fiberglass reinforced epoxy boards, electronic components, plastics, etc.) preserve their original shape and structure, allowing an easier consequent separation-classification and a more efficient and profitable recycling.

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Current Status on Leaching Precious Metals from Waste Printed Circuit Boards

Cited by 153 publications

References 13 publications

Urban Mining and Electrochemistry: Cyclic Voltammetry Study of Acidic Solutions from Electronic Wastes (Printed Circuit Boards) for Recovery of Cu, Zn, and Ni

Urban Mining and Electrochemistry: Cyclic Voltammetry Study of Acidic Solutions from Electronic Wastes (Printed Circuit Boards) for Recovery of Cu, Zn, and Ni

Electronic Waste Recycling

Electrochemical recycling of waste printed circuit boards in bromide media. Part I: preliminary leaching and dismantling tests

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