Use of the O2-Thiosemicarbazide System, for the Leaching of: Gold and Copper from WEEE &amp; Silver Contained in Mining Wastes

Cerecedo‐Sáenz, Eduardo; Cárdenas-Reyes, Edgar A.; Rojas-Calva, Abner H.; Reyes-Valderrama, María Isabel; Rodríguez-Lugo, Ventura; Toro, Norman; Gálvez, Edelmira D.; Acevedo-Sandoval, Otilio A.; Hernández-Ávila, Juan; Salinas‐Rodríguez, Eleazar

doi:10.3390/ma14237329

Cited by 4 publications

(4 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Cerecedo-Sáenz et al [ 14 ] provided a research study, entitled “Use of the O 2 -Thiosemicarbazide System, for the Leaching of: Gold and Copper from WEEE & Silver Contained in Mining Wastes”. A kinetic study of the leaching of Au and Cu contained in waste electrical and electronic equipment (WEEE) and Ag contained in mining wastes (MW), using the O 2 -thiosemicarbazide system, was performed.…”

Section: Short Description Of the Articles Published In This Special ...mentioning

confidence: 99%

Processing of End-of-Life Materials and Industrial Wastes

2022

View full text Add to dashboard Cite

This Special Issue (SI) offered the opportunity to present the latest scientific developments and findings in the field of processing of end-of-life materials and solid industrial wastes. Due to the large quantity of wastes generated and to their complex elemental and mineralogical composition, the approaches, methods and processes proposed for their decontamination, energy beneficiation and high-added-value metal recovery are complex and diverse. Some transversal research investigations using wastes as remediation agents and for synthesis of new materials were also included in the SI. After a brief introduction, the main scientific contributions and findings of each article published in the SI are summarized.

show abstract

Section: Short Description Of the Articles Published In This Special ...mentioning

confidence: 99%

Processing of End-of-Life Materials and Industrial Wastes

2022

View full text Add to dashboard Cite

show abstract

“…In order to maximize the recovery yields of the different metals present in WPCBs within a hydrometallurgical recovery process, it is appropriate, in some cases, to select the components to be treated. In addition, it is important to know the content of elements for each component treated in order to choose a reagent over another (optimizing the kinetics and thermodynamics of the process) [22,23]. For example, it has been seen that the presence of copper in the same leaching environment as gold results in a significant decrease in the recovery yield of the precious metal [24,25].…”

Section: Introductionmentioning

confidence: 99%

Chemical Characterization of an ARDUINO® Board and Its Surface Mount Devices for the Evaluation of Their Intrinsic Economic Value

2023

View full text Add to dashboard Cite

The remarkable technological development observed in recent decades has led to an exponential increase in the production of electrical and electronic devices. Regardless of their field of application or the type of device, electronic boards are a common feature of all these devices. For this reason, electronic boards represent a constant in electrical and electronic equipment waste. Knowing their composition and intrinsic economic value is essential for identifying sustainable disposal and valorization processes. In the literature, several articles report typical compositions of electronic boards, but it is rare to find a component-by-component characterization. This procedure is important to determine the components that need to be removed to increase the recovery yields of materials or to identify components with high concentrations of hazardous substances. For this reason, in this scientific article, we propose to examine the chemical composition of all the components of the Arduino® electronic board using advanced chemical analysis techniques. Arduino is a popular electronic board mainly used to prototype electronic projects rapidly. The chemical composition of the Arduino board has yet to be entirely determined to date. The decision to use the Arduino board is due to the fact that this board is widespread globally and could represent a reference study.

show abstract

“…Overall, recycling processes focus on concentrating the metals of interest (Au, Ag, Cu, Pd and others) in solution or in an ingot for selective separation [ 6 , 9 , 10 , 11 ]. Leaching agents such as thioureas, halides, cyanides and aqua regia are commonly used to separate the gold.…”

Section: Introductionmentioning

confidence: 99%

“…Most research does not consider the size and shape of the Au to be recovered in the design of new methodologies [ 11 , 12 , 13 , 15 , 16 , 17 , 18 , 19 ]. However, other factors such as the size and shape of the gold to be recovered must be taken into account.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Gold Nanoparticles from Gold Coatings Recovered from E-Waste Processors

et al. 2022

View full text Add to dashboard Cite

This work presents the synthesis of Au nanoparticles from gold coatings recovered from processor pins with minimal waste generation. The process consisted of four main steps: (1) physical recovery of pins, (2) recovery of gold coatings by acid digestion, (3) synthesis of HAuCl4 under mild conditions and, (4) synthesis of Au nanoparticles by the Turkevich method. The small dimensions of Au coatings allowed the synthesis of HAuCl4 with lower amounts of HClconc and HNO3conc than those used with aqua regia. This method has significant advantages, such as lower NO2(g) emission, easy post-treatment and purification, low synthesis cost and high yields. Gold nanoparticles synthesized from HAuCl4 were characterized by transmission electron microscopy (TEM) and UV-Vis spectroscopy. Size distribution analysis showed particles 14.23 nm in length and 12.05 nm in width, while absorption spectra showed a surface plasmon located at 523 nm; these characteristics were very similar to those observed with Au nanoparticles obtained with Aldrich’s reagent. It is suggested that recycling procedures can be improved by taking into account the size and shape of the metals to be recovered, thus introducing a new field of research known as hydronanometallurgy.

show abstract

Use of the O2-Thiosemicarbazide System, for the Leaching of: Gold and Copper from WEEE & Silver Contained in Mining Wastes

Cited by 4 publications

References 32 publications

Processing of End-of-Life Materials and Industrial Wastes

Processing of End-of-Life Materials and Industrial Wastes

Chemical Characterization of an ARDUINO® Board and Its Surface Mount Devices for the Evaluation of Their Intrinsic Economic Value

Synthesis of Gold Nanoparticles from Gold Coatings Recovered from E-Waste Processors

Contact Info

Product

Resources

About