Pyrometallurgy coupling bioleaching for recycling of waste printed circuit boards

Chu, Huichao; Qian, Can; Tian, Bingyang; Qi, Shiyue; Wang, Jia; Xin, Baoping

doi:10.1016/j.resconrec.2021.106018

Cited by 32 publications

(4 citation statements)

References 47 publications

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“…The researchers employed a less energy-intensive technique to reduce the size of the PCB from 14 mm to less than 1 mm. Another recent development by Chu and co-workers [ 214 ] utilized heat to prepare the feed for enhanced recovery. The nickel and copper content of the PCBs were oxidized and the waste was heated at 600 °C.…”

Section: Emerging Methods For Tetrabromobisphenol a Detection And Tre...mentioning

confidence: 99%

A Review on Tetrabromobisphenol A: Human Biomonitoring, Toxicity, Detection and Treatment in the Environment

et al. 2023

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Tetrabromobisphenol A (TBBPA) is a known endocrine disruptor employed in a range of consumer products and has been predominantly found in different environments through industrial processes and in human samples. In this review, we aimed to summarize published scientific evidence on human biomonitoring, toxic effects and mode of action of TBBPA in humans. Interestingly, an overview of various pretreatment methods, emerging detection methods, and treatment methods was elucidated. Studies on exposure routes in humans, a combination of detection methods, adsorbent-based treatments and degradation of TBBPA are in the preliminary phase and have several limitations. Therefore, in-depth studies on these subjects should be considered to enhance the accurate body load of non-invasive matrix, external exposure levels, optimal design of combined detection techniques, and degrading technology of TBBPA. Overall, this review will improve the scientific comprehension of TBBPA in humans as well as the environment, and the breakthrough for treating waste products containing TBBPA.

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Section: Emerging Methods For Tetrabromobisphenol a Detection And Tre...mentioning

confidence: 99%

A Review on Tetrabromobisphenol A: Human Biomonitoring, Toxicity, Detection and Treatment in the Environment

et al. 2023

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“…Many acidophilic bacteria can act as microorganisms for capturing metals from WPCB. For instance, Acidithiobacillus thiooxidans , Acidithiobacillus ferrooxidans , and Leptospirillum ferriphilum have been used to extract Cu and Ni in a slight acidic environment by Chu et al With the selected microbes and a cultivated medium, bioleaching could be achieved on ground-up WPCB at room temperature at an acidic or nearly neutral pH environment. Hong and Valix reported a bioleaching approach in which an experiment was conducted employing mesophilic Acidithiobacillus thiooxidans on Cu-rich electronic waste and achieved a 60% leaching rate of Cu .…”

Section: Introductionmentioning

confidence: 99%

Chemically Benign Electrometallurgical Treatment of Waste-Printed Circuit Board in Polyethylene Glycol for Metal Recovery

Liu,

Le,

Wang

et al. 2024

ACS Sustainable Resour. Manage.

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The rapid growth of the electronic industry and its high turnover product rate have promoted a surge in e-waste generation. An efficient recycling strategy to recover the metal content from e-waste is essential to developing a sustainable circular economy. Herein, we report a chemically benign and mild electrometallurgical approach to extract and recover the metallic content from real industrial e-waste at room temperature and atmospheric pressure in poly(ethylene glycol) (PEG), a chemically benign solvent commonly used for commodity and medical products. In this system, the metal content from e-waste is electrochemically oxidized to metal ions, which are then deposited in situ on the cathode in the same reaction cell. The reaction extracted over 11 metals from real e-waste samples with good Faradaic efficiency (FE), calculated from the deposited metal, scored as high as 65.1% during the electrolyte reuse trials. Cu was the most abundant metal in the recovered stream. The PEG electrolyte showed great robust properties and can be reused at least six times with no sign of composition change. Moreover, each trial improved Cu recovery selectivity for the subsequent trial as the carried-over Cu 2+ contributed positively to its depositions�the Cu selectivity almost doubled from 25.9% to 45.2% after the electrolyte was reused six times. The influence of different e-waste abundant metals on Cu's recovery rate was also examined. It was discovered that Al and Fe have a strong influence, but Sn does not. We also examined the recovery of precious metals Au, Ag, and Pd and observed Au recovered well with an excellent FE at 89.37%, but Ag and Pd could not be recovered efficiently due to their precipitations. In summary, the PEG electrolyte system offered a robust, safe, and mild electrochemical strategy to recover valuable metals from industrial e-waste.

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“…The presence of metal elements such as strontium, cadmium, lead, mercury, copper, arsenic, beryllium, barium, gold, platinum, silver and zinc, as well as all kinds of plastics and dangerous chemicals and compounds that destroy the ozone layer, such as polychlorobiphenyls, in the waste of electric boards and Electronics will have harmful and irreparable effects on the environment. ( In order to the recycling of metals in electronic waste, traditional methods of pyrometallurgy and hydrometallurgy have not been developed due to high energy consumption, high cost and the production of a lot of environmentally destructive substances (Chu et al 2022; Yang et al 2022). Biometallurgical methods include biological, environmentally friendly, effectiveness, and in many cases, they have been evaluated as very capable in extracting metals, but they require a long reaction time and are very slow (Yaashikaa et al 2022;Priya et al 2021).…”

Section: Introductionmentioning

confidence: 99%

Silver Extraction from Printed Circuit Boards using a Hybrid Supercritical Water and Carbon Dioxide Extraction process; Experimental Design and Optimization of the Process

Haghighi,

Khorshidi,

Zarei

et al. 2023

Preprint

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Electronic waste (E-waste) and its accumulation in recent years is turned in to a global issue and the management and technologies for recycling of this waste are aggressively growing. The main aim of this study is to increase the extraction efficiency of silver metal using supercritical carbon dioxide from computer printed circuit boards (PCBs) waste. Supercritical water pretreatment was used to more reachability of the silver within the PCBs structure and using ethanol co-solvent and organic ligands of Cyanex 302 ligand, Kelex and EDTA helped the efficiency enhancement of the process. The response surface method (RSM) and thermodynamic modeling was used in order to experimental design and optimization of the process. The optimized conditions for supercritical water pretreatment was determined to be 275 bar pressure, 431 ℃ temperature and 30 min residence time and for supercritical carbon dioxide extraction step it was calculated to be at the temperature of 50 ℃, dynamic residence time of 90.00 min and pressure of 300.00 bar with the response of 72.07% of efficiency for silver extraction. According to results of this study, it would be available to design and manufacture of a larger scale extraction unit to reach valuable amounts of precious silver metal from e-waste.

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Pyrometallurgy coupling bioleaching for recycling of waste printed circuit boards

Cited by 32 publications

References 47 publications

A Review on Tetrabromobisphenol A: Human Biomonitoring, Toxicity, Detection and Treatment in the Environment

A Review on Tetrabromobisphenol A: Human Biomonitoring, Toxicity, Detection and Treatment in the Environment

Chemically Benign Electrometallurgical Treatment of Waste-Printed Circuit Board in Polyethylene Glycol for Metal Recovery

Silver Extraction from Printed Circuit Boards using a Hybrid Supercritical Water and Carbon Dioxide Extraction process; Experimental Design and Optimization of the Process

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