Recovery of copper values from discarded random access memory cards via fluidization and thermal exposure

Barnwal, Amit; Dhawan, Nikhil

doi:10.1016/j.jclepro.2020.120516

Cited by 17 publications

(3 citation statements)

References 30 publications

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“…Other studies have confirmed that finer size ranges can lead to increased metal concentration, likely due to enhanced metal liberation. Barnwal and Dhawan [142] conducted separation experiments on the −500 µm fraction of discarded Random Access Memory (RAM) cards, utilizing both wet and dry fluidization as pre-concentration step, with the aim of assessing a processing method for copper and gold recovery. Their findings revealed a peak in enrichment within the −212 + 100 µm range, accompanied by a significant decrease below this threshold.…”

Section: Waste Of Electrical and Electronic Equipment (Weee)mentioning

confidence: 99%

Gravity Concentration in Urban Mining Applications—A Review

Ambrós

2023

Recycling

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Urban mining has emerged as a concept that goes beyond conventional recycling, as it aims to tackle both the challenges of solid waste generation and management, as well as the scarcity of primary resources. Gravity concentration has gained increasing attention as a promising method for addressing crucial challenges in urban mining applications. In this sense, this review provides a comprehensive and up-to-date overview of gravity concentration in urban mining processes, covering principles, techniques, current applications, recent advancements, challenges, and opportunities. Emphasis was placed on shifting from the commonly found literature focus on ore processing to solid waste processing. Three types of solid waste, namely plastics, construction and demolition waste (CDW), and waste from electrical and electronic equipment (WEEE), were chosen for a more in-depth examination due to their massive production and widespread generation. Discussions also considered the potential of gravity concentration to address the unique challenges in their processing and explored possibilities for future developments.

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Section: Waste Of Electrical and Electronic Equipment (Weee)mentioning

confidence: 99%

Gravity Concentration in Urban Mining Applications—A Review

Ambrós

2023

Recycling

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“…Instead of using heavy media separation, tapped density calculation was preferred ensuring no liquid entry and contamination of the samples. The tapped density of a powder is the ratio of the mass of the powder to the volume occupied by the powder after being tapped for a defined period, and it represents a random dense packing [5,44]. The variation of tapped density for different flotation products belonging to various size classes is shown in Fig.…”

Section: Flotation Processmentioning

confidence: 99%

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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“…Recycling WRAM is an important step because it could be a vital alternative to the limitless demand for precious metals in the earth’s crust, owing to its growing applications, and simultaneously contribute to the sound management of e-waste. WRAM is enriched with transitional and precious metals, making it quite promising for recycling. − Notably, e-waste contains a higher proportion of precious metals than obtained from the earth’s crust; thus, WRAM as waste is worth investigating as the future feedstock of precious metal sources. , Therefore, recovering metals from WRAM can attenuate environmental issues and simultaneously resolve the resource depletion dilemma. , …”

Section: Introductionmentioning

confidence: 99%

Realistic Approach for Recovering Gold from Waste Electronics by Thiourea Leaching and Adsorption Using a Covalent Porphyrin/Triphenylamine-Based Porous Polymer

Preetam,

Modak,

Naik

et al. 2024

ACS Appl. Polym. Mater.

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Recovering gold from electronics waste (e-waste) is essential for conserving valuable resources and reducing improper disposal's environmental impact. However, the selective recovery of gold from e-waste is a significant challenge due to its heterogeneous nature and existing inappropriate recovering processes. Considering these issues, in this study, we investigated a promising approach for recovering gold from waste random access memory (WRAM). For that, we synthesized a porous nanonet polymer (Por-net) through a one-pot Friedel−Crafts polymerization method containing multiple functional groups, i.e., porphyrin and triphenylamine, within a single framework material, acting as a bifunctional chelating ligand. The adsorption results were significantly influenced by the pH conditions. Around 1250 mg g −1 capacity of Au was recovered under realistic experimental conditions in an acidic medium. Moreover, the adsorption isotherm and kinetic study revealed the Langmuir model and pseudo-second-order kinetic fittings for the Au adsorption on Por-net. Properties such as the high surface area and structure of Por-net as well as the Au@Por-net polymer were comprehensively characterized by X-ray diffraction (XRD), inductively coupled plasma mass spectrometry (ICP-MS), thermogravimetric analysis (TGA), solid-state 13 C cross-polarization magic angle spinning (CP-MAS) NMR, N 2 sorption analysis field emission scanning electron microscopy (FESEM), high-resolution transmission electron microscopy (HRTEM), electron paramagnetic resonance (EPR), ultraviolet (UV)−visible, time-resolved photoluminescence, X-ray photoelectron spectroscopy (XPS), and Fourier transform infrared spectroscopy (FTIR). The results showed its efficient potential for recovering gold from real e-waste sources. Por-net showed excellent desorption efficiency, recyclability, selectivity, and chemical stability. At last, the economic feasibility of Por-net for the purpose of recovering gold from ewaste is also explored. The present work represents a greener and feasible approach to promoting sustainable development, circular economy, and responsible waste management using an effective porous polymer as a scaffold.

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Recovery of copper values from discarded random access memory cards via fluidization and thermal exposure

Cited by 17 publications

References 30 publications

Gravity Concentration in Urban Mining Applications—A Review

Gravity Concentration in Urban Mining Applications—A Review

Processing of Discarded Printed Circuit Board Fines via Flotation

Realistic Approach for Recovering Gold from Waste Electronics by Thiourea Leaching and Adsorption Using a Covalent Porphyrin/Triphenylamine-Based Porous Polymer

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