Chemical–Electrochemical Process Concept for Lead Recovery from Waste Cathode Ray Tube Glass

Imre‐Lucaci, Árpád; Fogarasi, Melinda; Imre-Lucaci, Florica; Fogarasi, Szabolcs

doi:10.3390/ma14061546

Cited by 14 publications

(7 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Gold is extensively used in a wide variety of industries, such as chemical catalysis and medicine because of its excellent physicochemical properties (Imre-Lucaci et al, 2017). In addition, rapid economic and social development has also resulted in a continuous increase in the demand for gold (Li et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

First Gold Recovery from PCBs through en-thiosulfate Leaching and Selective Adsorption with Carbon

Li,

Chen,

et al. 2024

Preprint

View full text Add to dashboard Cite

Eco-friendly gold extraction from printed circuit boards (PCBs) is highly attractive due to the increasing demand for gold in various fields. The conventional Cu2+-NH3-S2O32− method for PCBs involves polluting NH3 gas and requires additional copper. This study explored a new eco-friendly alternative using ethylenediamine (en) and thiosulfate to extract gold from CPU (the PCB material used in this study). The results showed that 81% of gold in CPUs could be successfully leached out after 48 hours, using 10 mM ethylenediamine and 0.2 M thiosulfate. Various analyses, including SEM, ICP, XPS, were conducted to further investigate the process. It was found that the metal in CPU was Au(0)→Ni(II)→Cu(0) from the outside to the inside, and possible gold leaching mechanism was related to the oxidization of Cu(en)22+ produced from CPU’s defective position and the presence of S2O32−. As for Au(S2O3)23− recovery, different from our previous study, it is necessary to add a small amount of ethylenediamine (en) except for carbon and thiosemicarbazone (TSC); consequently, a gold adsorption efficiency of 99% was achieved. In summary, the leaching method proposed in this work solved the problem of NH3 pollution of traditional one and achieves green, efficient, and selective gold adsorption from CPU leaching solution through a simple method, which is hopeful to replace the traditional unfriendly Cu-NH3-S2O32−.

show abstract

Section: Introductionmentioning

confidence: 99%

First Gold Recovery from PCBs through en-thiosulfate Leaching and Selective Adsorption with Carbon

Li,

Chen,

et al. 2024

Preprint

View full text Add to dashboard Cite

show abstract

“…In compliance with European Union regulations, the acceptable range for copper concentration in drinking water sources, including rivers, is set between 1.5 and 2 mg/L. Therefore, it is advisable to ensure that discharged effluents remain below this limit for adhering to the prescribed guidelines [2]. Numerous techniques have been employed for the removal of copper from waste streams, offering a wide array of approaches including adsorption, chemical precipitation, ion exchange, biosorption, reverse osmosis, membrane separation with ion exchange, and electrochemical precipitation.…”

Section: -Introductionmentioning

confidence: 99%

Kinetic Modeling of Electromembrane Extraction of Copper using a Novel Electrolytic Cell Provided with a Supported Liquid Membrane

Kadhim,

Flayeh,

Abbar

2023

IJCPE

View full text Add to dashboard Cite

The aim of this study is to investigate the kinetics of copper removal from aqueous solutions using an electromembrane extraction (EME) system. To achieve this, a unique electrochemical cell design was adopted comprising two glass chambers, a supported liquid membrane (SLM), a graphite anode, and a stainless-steel cathode. The SLM consisted of a polypropylene flat membrane infused with 1-octanol as a solvent and bis(2-ethylhexyl) phosphate (DEHP) as a carrier. The impact of various factors on the kinetics constant rate was outlined, including the applied voltage, initial pH of the donor phase solution, and initial copper concentration. The results demonstrated a significant influence of the applied voltage on enhancing the rate of copper mass transfer across the membrane. As the applied voltage increased, the rate constant also increased. Additionally, increasing the pH of the solution led to an initial elevate in the rate constant, reaching a maximum value at pH 5, after which it started to decline. Moreover, higher initial copper concentrations had an adverse effect on the rate constant. Notably, the concentration decay profiles observed under different operating conditions followed first-order kinetics, with correlation coefficients exceeding 0.99. The elucidation of this discovery emanated from a remarkable and striking congruence between the experimental data and the mathematical underpinnings of the first-order kinetics model. This serendipitous alignment profoundly reinforced the robustness, veracity, and unwavering reliability of meticulously obtained results, amplifying the credibility and trustworthiness of the present comprehensive study.

show abstract

“…Geopolymers are treated as an innovative material, providing plenty of opportunities for application, among the others in the building industry, as an environmentally friendly alternative for concrete [ 22 ]. Geopolymers allow for some savings in greenhouse gas emissions [ 23 , 24 , 25 ], enable recycling of wastes, (often hazardous ones, such as crushed cathode ray tube (CRT) glass, containing lead which would have to be recovered e.g., by a chemical–electrochemical process [ 26 ]) [ 23 , 27 , 28 ], can achieve comparable or even better strength values than ordinary Portland cement (OPC) concrete [ 29 , 30 ]. Moreover they show properties such as fire and heat resistance [ 31 , 32 , 33 ], acid, chloride, and corrosion resistance [ 33 , 34 ], and the ability to immobilize toxic metals [ 35 ].…”

Section: Introductionmentioning

confidence: 99%

Influence of the Composition and Curing Time on Mechanical Properties of Fluidized Bed Combustion Fly Ash-Based Geopolymer

2021

View full text Add to dashboard Cite

This paper presents novel research on a fluidized bed combustion (FBC) fly ash-based geopolymer as a contribution to the problem of FBC fly ash disposal, and a proposal for a new geopolymer composition—an environmentally friendly material that is possible to use in construction. Geopolymer samples of various composition (containing FBC fly ash as the main raw material, metakaolin and CRT glass as additional components, and sodium silicate and sodium hydroxide as activators) were subjected to flexural and compressive strength tests. An investigation on the effect of the demolding time was carried out on one selected mixture. The test showed that both the composition and the demolding time have a decisive influence on the basic mechanical properties. A mixture containing FBC fly ash to metakaolin in a mass ratio of 3:1, removed from the mold after 14 days, was found to be the best in terms of the mechanical parameters expected from a material that could be used in construction, e.g., for the production of precast elements. According to the results obtained, FBC fly ash is a promising and environmentally friendly raw material for the production of geopolymer, with good mechanical properties and low density. Moreover, a high compressive strength can be obtained by curing the geopolymer at ambient temperature.

show abstract

Chemical–Electrochemical Process Concept for Lead Recovery from Waste Cathode Ray Tube Glass

Cited by 14 publications

References 31 publications

First Gold Recovery from PCBs through en-thiosulfate Leaching and Selective Adsorption with Carbon

First Gold Recovery from PCBs through en-thiosulfate Leaching and Selective Adsorption with Carbon

Kinetic Modeling of Electromembrane Extraction of Copper using a Novel Electrolytic Cell Provided with a Supported Liquid Membrane

Influence of the Composition and Curing Time on Mechanical Properties of Fluidized Bed Combustion Fly Ash-Based Geopolymer

Contact Info

Product

Resources

About