Evaluation of autoclave oxidation of sulfide concentrates as applied to the subsequent sulfite-thiosulfate leaching of noble metals

Gudkov, A. S.; Zhuchkov, I. A.; Mineev, G. G.

doi:10.3103/s1067821210060064

Cited by 5 publications

(2 citation statements)

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“…For this reason, reaction (2) shows the necessity to have sulfite ions in the leaching solution in order to direct the reaction to the right and prevent the thiosulfate degradation (Kerley, 1983;Gudkov et al, 2010aGudkov et al, , 2010cAylmore and Muir, 2001;Grosse et al, 2003).…”

Section: Effect Of Sulfite In Thiosulfate Leaching Solutionsmentioning

confidence: 98%

Silver leaching with the thiosulfate–nitrite–sulfite–copper alternative system

2015

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Section: Effect Of Sulfite In Thiosulfate Leaching Solutionsmentioning

confidence: 98%

Silver leaching with the thiosulfate–nitrite–sulfite–copper alternative system

2015

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“…It has been proposed the thiosulfate systems as the most promising leaching systems for silver and gold. [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20]. The ammoniacal thiosulfate leaching system has been evaluated for the recovery of silver and gold, the researches have revealed that it presents an interesting advantage over the cyanidation in terms of the leaching kinetics; the gold and silver dissolution rates are 18-20 times higher than the cyanidation, due to the formation of a catalytic oxidant, the so-called "cupric tetraamine".…”

Section: Introductionmentioning

confidence: 99%

A study of the metallic silver dissolution with the MEA-NH3-Cu system

Reyes-Sandoval

Fuentes-Aceituno

2018

Matéria (Rio J.)

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Leaching of silver from minerals has been studied for decades. Recently, research has been focused on the substitution of cyanide (because of its high toxicity) from hydrometallurgical operations. In this sense, the development of alternative-green leaching solutions for the recovery of metallic silver from minerals and urban mines is necessary. In this research, a thermodynamic-kinetic study of the alternative system "monoethanolamine (MEA)-ammonium sulfate-cupric sulfate" was performed for the dissolution of metallic silver, varying the pH and the cupric ion concentration at room temperature. Furthermore, this research aims to evaluate the silver dissolution behavior at a pH lower than 10.2, elucidating the rate determining step of the silver dissolution process at these conditions of pH and cupric ion concentration. Thermodynamic results confirm that the MEA and NH 3 can complex silver generating the species: Ag(MEA) 2 + , AgMEA-, Ag(NH 3) 2 + , AgNH 3 + respectively. It was evaluated the effect of varying the pH (8.8, 9.9 and 9) and the cupric sulfate concentration (0.1, 0.15 and, 0.2 M at pH 9) on the kinetics of silver dissolution. The results revealed, the possibility to leach a 39% of silver using a leaching solution containing: 0.15 M cupric sulfate, 0.05 M MEA and 0.4 M ammonium sulfate at pH 9. The kinetic analysis showed that the silver dissolution is controlled by the diffusion of fluid species through a porous layer composed of copper oxides, which was ratified by SEM and EDS analysis. Finally the present paper, open the possibility to optimize the molar ratio MEA:NH 3 to maximize the silver dissolution kinetics.

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