Kinetics of metallic silver leaching in the O2–thiosulfate system

Rivera, Isauro; Patiño, Francisco; Roca, A.; Cruells, M.

doi:10.1016/j.hydromet.2015.05.009

Cited by 31 publications

(29 citation statements)

References 18 publications

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“…decrease in the size of particles, which is indicative of a larger surface area being in contact with the leaching solution and thus, accelerating the reaction [19]. Figure 7b shows that kexp is inversely proportional to the particle diameter (kexp vs. 1/d0).…”

Section: Particle Size Effectmentioning

confidence: 98%

“…Furthermore, studies on the substitution of the leaching agent have included the use of compounds, including thiocyanate (SCN − ), thiourea (CH 4 N 2 S) and thiosulfate (S 2 O 3 2− ) [15][16][17][18]. The latter two have been shown as the most effective processes, as they provide flexibility in stage processes and allow for the application of methods that have a lower environmental impact [19,20].…”

Section: Introductionmentioning

confidence: 99%

“…Some studies have determined that for the leaching process with thiosulfate using oxidizing agents, the complexing agent shows a level of degradation that could limit the formation of complexes by the metals of interest, since it generates the formation of elemental sulfur, sulfites and sulfates, as shown in Equations (1)- (5) [19]. …”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Kinetic Study of Ag Leaching from Arsenic Sulfosalts in the S2O32−-O2-NaOH System

Ruiz

Tapia

Domínguez

et al. 2017

Metals

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Abstract:In Zimapan, Mexico abundant mineral species have been identified. However, a significant number of these precious metals appear to be related to complex sulfides, as is the case of silver (Ag) in sulfosalts. In this work, a kinetic study of the formation of Ag complexes in the AgAsS 2 -S 2 O 3 2− -O 2 -NaOH system from a Zn concentrate found in the Zimapan mining district was conducted. The kinetic model application on Ag leaching shows a linear adjustment in the valuation of the particle size effect. The rate of formation of Ag complexes is dependent of temperature, leaching agent concentration and OH − concentration. Furthermore, graphical verification of the kinetic models indicates that the kinetics of the formation of Ag complexes correspond to the shrinking core model with chemical controls as the controlling stage. The formation of Ag complexes was confirmed by Fourier transform infrared (FTIR) spectroscopy.

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Section: Particle Size Effectmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Kinetic Study of Ag Leaching from Arsenic Sulfosalts in the S2O32−-O2-NaOH System

Ruiz

Tapia

Domínguez

et al. 2017

Metals

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“…Rivera et al 35) studied the dissolution kinetics of Ag in the thiosulfate solution in the presence of oxygen. The leaching process was controlled by mass transfer of oxygen in the solid-liquid interface and the stirring rate has an important influence on the transport of oxygen.…”

Section: Leaching With Sodium Thiosulfate and Oxygenmentioning

confidence: 99%

Chemical Leaching of Silver from Diverse Resources

Xing¹,

Lee²

2017

Journal of the Korean Institute of Resources Recycling

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The special properties of silver are often indispensable in the manufacture of advanced materials. Therefore, it is of importance to develop a process to recover silver which is necessary for the production of advanced materials from diverse resources. In this manuscript, the developed processes for the leaching of silver from diverse resources are reviewed. For this purpose, the advantages and disadvantages of using some inorganic acids (nitric and sulfuric acid) and their mixture with other oxidizing agents (ozone, oxygen, hydrogen peroxide and ferric ion) were investigated. Moreover, the leaching of silver with thiourea and thiosulfate was compared over those by inorganic acids in terms of environmental effect.

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“…In addition, Pb also has a seriously detrimental impact on the dissolution of Au and Ag and thus it is advantageous to remove lead before the leaching step 15) . In addition, the kinetic study on the leaching of gold and silver using different systems has been done to investigate the leaching mechanism in each system 4,[16][17][18][19] . According to these works, the leaching reaction of gold and silver in either thiosulfate or thiourea solution is mostly controlled by either the mass transfer of oxygen to the solid-liquid interface or the chemical reaction at the interface.…”

Section: Introductionmentioning

confidence: 99%

Leaching of the Mixture of Metallic Gold and Silver

Xing¹,

Lee²

2017

Journal of the Korean Institute of Resources Recycling

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주제어 : 금, 은, 염산, thiosulfate, thiourea, AbstractIn order to exclude the effect of uneven distribution of gold in anode slime, the dissolution of gold and silver from the metal mixture was investigated in different systems, such as the mixture of hydrochloric acid and oxidizing reagents (H , Au was completely dissolved but the leaching percentage of Ag was around 1%. In both thiosulfate and thiourea solution, gold was not dissolved at all. The presence of ferric ion in acidic thiourea solution showed a favorable effect on the leaching of silver but further study is necessary to elucidate the combined effect of ferric ion and sulfuric acid.

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Kinetics of metallic silver leaching in the O2–thiosulfate system

Cited by 31 publications

References 18 publications

Kinetic Study of Ag Leaching from Arsenic Sulfosalts in the S2O32−-O2-NaOH System

Kinetic Study of Ag Leaching from Arsenic Sulfosalts in the S2O32−-O2-NaOH System

Chemical Leaching of Silver from Diverse Resources

Leaching of the Mixture of Metallic Gold and Silver

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