Hydrometallurgical Treatment of Waste Printed Circuit Boards: Bromine Leaching

Cui, Hao; Anderson, Corby

doi:10.3390/met10040462

Cited by 37 publications

(12 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The pretreatment processes such as soaking in NaOH solution [7] and microwave pyrolysis [8] and mineral processing processes [9] such as flotation [10] were investigated to enhance the dissolution efficiency of valuable metals from PCBs. Leaching processes of PCBs have been examined using hydrogen peroxide (H 2 O 2 ) [11][12][13][14], ammonia solution [10,[14][15][16], HNO 3 [16][17][18], halogen [16,17,19,20], glycine [12,13], and ionic liquid [21]. Bacterial leaching processes of PCBs have also been reported as environment-benign processes, where Phanerochaete chrysosporium [22], Acidithiobacillus ferrooxidans [23], Leptospirillum ferriphilum or its mixed culture Metals 2021, 11, 1369 2 of 11 with Acidithiobacillus ferrooxidans [24][25][26], and Frankia sp.…”

Section: Introductionmentioning

confidence: 99%

Leaching of Copper from Waste-Printed Circuit Boards (PCBs) in Sulfate Medium Using Cupric Ion and Oxygen

Park

Eom

Yoo

et al. 2021

Metals

View full text Add to dashboard Cite

In the present paper, the leaching of copper from printed circuit boards (PCBs) using sulfuric acid with Cu2+ and O2 is proposed. The effects of various process parameters such as agitation speed, temperature, the type and the flow rate of gas, initial Cu2+ concentration, and pulp density were investigated to examine the dissolution behavior of Cu from PCBs in 1 mol/L sulfuric acid. The kinetic studies were performed using the obtained leaching data. The leaching rate of Cu from PCBs was found to be higher on addition of Cu2+ and O2 to the leachant in comparison with the addition of O2 or both Cu2+ and N2 in the leachant. The leaching efficiency of Cu was found to be increased with increasing agitation speed, temperature, O2 flow rate, and initial Cu2+ concentration and decreasing pulp density. The 96% of Cu leaching efficiency was obtained under the following conditions: sulfuric acid concentration, 1 mol/L; temperature, 90 °C; agitation speed, 600 rpm; pulp density, 1%; initial Cu2+ concentration, 10,000 mg/L; and O2 flow rate, 1000 cc/min. The leaching data and analyses indicate that the Cu leaching from PCBs followed the reaction-controlled model satisfactorily and determined that the activation energy was found to be 23.8 kJ/mol. Therefore, these results indicate that the sulfuric acid solution with Cu2+ and O2 as a mild leach medium without strong oxidants such as HNO3, H2O2, and Fe3+ is valid for Cu leaching from PCBs.

show abstract

Section: Introductionmentioning

confidence: 99%

Leaching of Copper from Waste-Printed Circuit Boards (PCBs) in Sulfate Medium Using Cupric Ion and Oxygen

Park

Eom

Yoo

et al. 2021

Metals

View full text Add to dashboard Cite

show abstract

“…Research is centred around optimising the use of leaching agents that meet these criteria [147]. Numerous studies have focused on the application of hydrometallurgy for the recovery of base and precious metals from e-wastes [148][149][150][151][152][153][154][155][156][157][158].…”

Section: Hydrometallurgymentioning

confidence: 99%

“…As such, several substitutes have been investigated. These include thiourea, thiosulfate and halides [148,149,[151][152][153][154].…”

Section: Leaching Process Example Of Reagent Referencementioning

confidence: 99%

See 1 more Smart Citation

E-Waste Recycling and Resource Recovery: A Review on Technologies, Barriers and Enablers with a Focus on Oceania

Yken

Boxall

Cheng

et al. 2021

Metals

107

View full text Add to dashboard Cite

Electronic e-waste (e-waste) is a growing problem worldwide. In 2019, total global production reached 53.6 million tons, and is estimated to increase to 74.7 million tons by 2030. This rapid increase is largely fuelled by higher consumption rates of electrical and electronic goods, shorter life cycles and fewer repair options. E-waste is classed as a hazardous substance, and if not collected and recycled properly, can have adverse environmental impacts. The recoverable material in e-waste represents significant economic value, with the total value of e-waste generated in 2019 estimated to be US $57 billion. Despite the inherent value of this waste, only 17.4% of e-waste was recycled globally in 2019, which highlights the need to establish proper recycling processes at a regional level. This review provides an overview of global e-waste production and current technologies for recycling e-waste and recovery of valuable material such as glass, plastic and metals. The paper also discusses the barriers and enablers influencing e-waste recycling with a specific focus on Oceania.

show abstract

“…Cui et al [20] submitted a research effort entitled "Hydrometallurgical Treatment of Waste Printed Circuit Boards: Bromine Leaching". This paper demonstrates the recovery of valuable metals from shredded waste-printed circuit boards (WPCBs) by bromine leaching.…”

Section: Contributionsmentioning

confidence: 99%