Recovering metals from motherboard and memory board waste through sulfuric leaching

Martins, Thamiris Auxiliadora Gonçalves; Caldas, Marcos Paulo Kohler; Moraes, Viviane Tavares de; Tenório, Jorge Alberto Soares; Espinosa, Denise Crocce Romano

doi:10.1016/j.jece.2021.106789

Cited by 13 publications

(4 citation statements)

References 47 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As we saw in previous experiments, the leaching degree of Zn reaches a plateau of 40% due to the exhaustion of available zinc oxide (14), whereas zinc sulfide passivates (15). However, the presence of hydrogen peroxide disrupts zinc sulfide passivation by causing it to produce zinc sulfates without the formation of a sulfur layer (21).…”

Section: Influence Of Hydrogen Peroxide Concentration On Sulfuric Aci...supporting

confidence: 53%

“…A review of the literature provides several examples of leaching mediums that could be used to maximize the extraction of valuable materials from waste PCB, among them: mineral acids (sulfuric [14,15], nitric [16,17], and hydrochloric [18,19]), together with suitable oxidizing agents such as hydrogen peroxide [15,20,21] and halogens [22,23]. In addition to acidic leaching mediums, strong bases such as sodium hydroxide [24], potassium hydroxide [25], or their mixture [26] could be utilized.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A Multifocal Study Investigation of Pyrolyzed Printed Circuit Board Leaching

Jovanović

Bugarčić

Petronijević

et al. 2022

Metals

View full text Add to dashboard Cite

Electric waste from numerous devices that are put out of use every day has some form of printed circuit board that contains precious and valuable metals in their components. In order to extract these metals, the printed circuit boards were crushed and pyrolyzed into powder. The fine pyrolyzed printed circuit board (PPCB) powder was separated into fractions, and the fine metallic fraction was used as a raw material for metal leaching extraction. In order to better understand how various metal species react in leaching media, several leaching agents were used (sulfuric acid, nitric acid, glycine, and acid mine drainage-AMD) alone, and with the addition of hydrogen peroxide. Additionally, the influence of the S/L ratio and leaching temperature were investigated in sulfuric acid leaching solutions, as this is the one most widely used. In one case, the reactor was heated in a thermal bath, while in the other, it was heated in an ultrasonic bath. Lastly, several experiments were conducted with a (consecutive) two-pronged leaching approach, with and without applied pretreatment. The aim of this paper is to give a multifocal and detailed approach to how metals such as Al, Cu, Co, Zn, Sn, and Ca behave when extracted from fine PPCB powder. However, some attention is given to Nd, Pd, Pb, and Ba as well. One of the main findings is that regardless of the pretreatment or the sequence of leaching media applied, consecutive two-pronged leaching cannot be used for selective metal extraction. However, AMD was found to be suitable for selective leaching with very limited applications.

show abstract

Section: Influence Of Hydrogen Peroxide Concentration On Sulfuric Aci...supporting

confidence: 53%

Section: Introductionmentioning

confidence: 99%

A Multifocal Study Investigation of Pyrolyzed Printed Circuit Board Leaching

Jovanović

Bugarčić

Petronijević

et al. 2022

Metals

View full text Add to dashboard Cite

show abstract

“…At 25 °C, Cu leaching was 18% and then 0% at 70 and 90 °C. As the temperature in the leaching reaction increases, the oxygen activity decreases, 32 and the redox potential of the solution is lower than Cu dissolution. The Pourbaix diagram shown in Figure S5 demonstrated that in the pH and redox potential of the leach liquor (3.89 and 0.5 V), Cu will not be leached at 90 °C while Al, Ni, Co, and Li precipitate (Figure S6).…”

Section: Leaching With Inorganic Acidmentioning

confidence: 99%

Design of Recycling Processes for NCA-Type Li-Ion Batteries from Electric Vehicles toward the Circular Economy

de Castro,

Romano Espinosa,

Gobo

et al. 2024

Energy Fuels

View full text Add to dashboard Cite

NCA batteries represent 8% of the market share, and the literature lacks recycling studies and routes toward a cost-effective recycling process. The present study aimed to develop the hydrometallurgical recycling process of NCA cylindrical batteries. The cells were discharged, followed by physical treatment before leaching. Three different acids were evaluated: H2SO4, H3PO4, and citric acid. Reducing agents were not necessary due to the presence of Al foils, which reduces leaching costs. Citric acid represented a better cost-effective option, but solid–liquid separation represents a drawback to the process. After H2SO4 leaching at 90 °C for 90 min in a solid–liquid ratio of 1/5 and 2.0 mol/L without Cu leaching, Al was separated by precipitation followed by solvent extraction for Co separation using Cyanex 272. Ni was obtained as hydroxide, and Li crystallized as sulfate. The mass balance demonstrated that about 92% of Li, 80% of Ni, and 85% of Co can be recovered in hydrometallurgical processing. Products with purity >95% can be used in battery and stainless-steel production. The process has the potential to have a low CO2 footprint, and future studies will explore it.

show abstract

“…Another well-known direction of management and processing of waste containing metals is leaching, or extraction, of valuable components with various reactants [28]. Selective extractants are used to separate certain metals from undesirable components and from each other or in groups [29][30][31]. The metal-containing filtrate is separated individually by solvent extraction using cationic, anionic, and neutral extractants.…”

mentioning

confidence: 99%

Electric steelmaking dust as a raw material for coagulant production

Свергузова

Sapronova

Zubkova

et al. 2023

PMI

View full text Add to dashboard Cite

The paper describes the issues associated with waste generated during steel production and processing, in particular the dust from electric arc furnaces (EAF). An effective solution for the disposal of such waste is its involvement in processing to obtain valuable products. This paper studies the physical and chemical properties of EAF dust produced during the smelting of metallized pellets and captured by the dust and gas cleaning system of the steel-smelting shop at the Oskol Electrometallurgical Combine, Belgorod Region. The results obtained in the study of the chemical and disperse compositions of dust, the microstructure of the surface made it possible to propose the use of dust as a raw material for coagulant production. The conditions of acid-thermal treatment of dust are determined, contributing to the partial dissolution of iron (II), (III), and aluminium compounds, which ensure the coagulation processes during wastewater treatment. Model solutions show high efficiency (> 95 %) of water treatment from heavy metal ions by modified EAF dust.

show abstract

Recovering metals from motherboard and memory board waste through sulfuric leaching

Cited by 13 publications

References 47 publications

A Multifocal Study Investigation of Pyrolyzed Printed Circuit Board Leaching

A Multifocal Study Investigation of Pyrolyzed Printed Circuit Board Leaching

Design of Recycling Processes for NCA-Type Li-Ion Batteries from Electric Vehicles toward the Circular Economy

Electric steelmaking dust as a raw material for coagulant production

Contact Info

Product

Resources

About