Metallurgical processes for hardening of 22Karat Gold for light weight and high strength jewelry manufacturing

Saradesh, K. M.; Vinodkumar, G. S.

doi:10.1016/j.jmrt.2019.12.033

Cited by 11 publications

(2 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Currently, silver and copper gold alloys are used as raw materials for coins and cutlery production, and alloys with copper, platinum, and palladium are used to make jewelry [ 4 ]. Gold thin films are able to reflect up to 98% of incident infrared radiation, being currently involved in satellite construction and the production of space visors, giving them an increased protection degree.…”

Section: Introductionmentioning

confidence: 99%

Adsorbent Material Based on Carbon Black and Bismuth with Tunable Properties for Gold Recovery

et al. 2023

View full text Add to dashboard Cite

Adsorption recovery of precious metals on a variety of solid substrates has steadily gained increased attention in recent years. Special attention was paid to the studies on the characterization of the adsorptive properties of materials with a high affinity for gold depending on the nature of the pendant groups present in the structure of the material. The aim of the present work was to synthesize and characterize a new material by using the sol-gel synthesis method (designated as BCb/CB). In this case, synthesis involved the following precursors: bismuth carbonate (III), carbon black, and IGEPAL surfactant (octylphenoxypolyethoxyethanol). Immobilization of the heterojunction as bismuth oxide over a flexible support such as carbon black (CB) can prevent their elution in solution and make it versatile for its use in a system. In this work, a new adsorbent material based on bismuth carbonate supported over carbon black (BCb/CB) was developed and used further for gold recovery from aqueous solutions. The required material was characterized physically/chemically by scanning electron microscopy (SEM); energy dispersive X-ray spectrometry (EDX); X-ray diffraction (XRD); thermal analysis (DTG/DTA); atomic force microscopy (AFM). The Brunauer–Emmett–Teller (BET) method was used to determine the specific surface area indicating a value of approximately 40 m2/g, higher than the surface of CB precursor (36 m2/g). The adsorptive properties and the adsorption mechanism of the materials were highlighted in order to recover Au(III). For this, static adsorption studies were carried out. The parameters that influence the adsorption process were studied, namely: the pH, the contact time, the temperature, and the initial concentration of the gold ions in the used solution. In order to establish the mechanism of the adsorption process, kinetic, thermodynamic, and equilibrium studies were carried out. Experimental data proved that the gold recovery can be conducted with maximum performance at pH 3, at room temperature. Thermodynamic studies proved that the gold adsorption on BCb/CB material is a spontaneous and endothermal process. The results indicate a total adsorption capacity of 13.1 mg Au(III)/g material. By using this material in real solutions, a recovery efficiency of 90.5% was obtained, concomitant with a higher selectivity (around 95%).

show abstract

Section: Introductionmentioning

confidence: 99%

Adsorbent Material Based on Carbon Black and Bismuth with Tunable Properties for Gold Recovery

et al. 2023

View full text Add to dashboard Cite

show abstract

“…This element is widely applied in the production of stainless steel. In the jewelry industry, despite its allergenic properties, nickel is used to make jewelry or eyeglass frames [ 13 ]. The basic information about nickel properties and applications is presented in Figure 1 .…”

Section: Introductionmentioning

confidence: 99%

Determination of the Ni(II) Ions Sorption Mechanism on Dowex PSR2 and Dowex PSR3 Ion Exchangers Based on Spectroscopic Studies

et al. 2023

View full text Add to dashboard Cite

This paper estimates the suitability of the strongly basic anion exchangers, Dowex PSR2 and Dowex PSR3, as sorbents of nickel ions in aqueous solutions. These actions are aimed at searching for new solutions due to the growing discharge of nickel into wastewaters, primarily due to its addition to steel. The nickel sorption experiments were conducted under static conditions and resulted in the optimization of pH, phase contact time, initial solution concentration, and temperature. The next step was to calculate the kinetic, isothermal, and thermodynamic parameters. Moreover, the ion exchangers were characterized by means of Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, and CHN elemental analysis. It was found that the sorption process was most effective at pH 6 after 240 min and at the temperature of 293 K. The values of the thermodynamic parameters revealed that the adsorption was exothermic and spontaneous. The physicochemical analyses combined with the experimental research enabled determination of the sorption mechanism of Ni(II) ions.

show abstract

The age hardenability of 22 karat gold (Au-5.8wt.%Cu-2.5wt.%Ag) alloyed with titanium

Saradesh

Ravi

Vinodkumar³

2021

Gold Bull

View full text Add to dashboard Cite

Metallurgical processes for hardening of 22Karat Gold for light weight and high strength jewelry manufacturing

Cited by 11 publications

References 15 publications

Adsorbent Material Based on Carbon Black and Bismuth with Tunable Properties for Gold Recovery

Adsorbent Material Based on Carbon Black and Bismuth with Tunable Properties for Gold Recovery

Determination of the Ni(II) Ions Sorption Mechanism on Dowex PSR2 and Dowex PSR3 Ion Exchangers Based on Spectroscopic Studies

The age hardenability of 22 karat gold (Au-5.8wt.%Cu-2.5wt.%Ag) alloyed with titanium

Contact Info

Product

Resources

About