Leaching kinetics in cyanide media of Ag contained in the industrial mining-metallurgical wastes in the state of Hidalgo, Mexico

Hernández, Juan; Patiño, Francisco; Rivera, Isauro; Reyes, Iván A.; Flores, Misrael Uriel; Juárez, Julio C.; Reyes, Martín

doi:10.1016/j.ijmst.2014.07.003

Cited by 12 publications

(9 citation statements)

References 5 publications

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“…In previous work, the nature of heterogeneous reactions (solid-liquid) was studied, referring that the percent of conversion and the speed with which the reaction takes place show an important temperature dependence, suggesting a higher energy requirement for an efficient leaching process [18,19]. The results of the leaching tests at different temperatures that are seen in Figure 8 report high rates of silver conversion in solution with regard to the temperature increase, reaching a maximum dissolution of 97.8% Ag at 333 K.…”

Section: Discussionmentioning

confidence: 99%

Influence of Temperature on the Formation of Ag Complexed in a S2O32−–O2 System

et al. 2017

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Metallic elements of higher economic value, occurring in the mineralogy of Zimapán, are Pb, Zn, Cu, and Fe; said elements are sold as concentrates, which, even after processing, generally include significant concentrations of Mo, Cd, Sb, Ag, and As that can be recovered through different leaching methods. In this work, the influence of temperature in the complexation of silver contained in a concentrate of Zn using the technology of thiosulfate with oxygen injection was studied. Chemical and mineralogical characterization of the mineral concentrate from the state of Hidalgo, Mexico confirmed the existence of silver contained in a sulfide of silver arsenic (AgAsS 2 ) by X-ray Diffraction (XRD). The results obtained by Atomic Absorption Spectrophotometry (AAS) reported abundant metallic contents (% w/w) (48% Zn, 10.63% Fe, 1.97% Cu, 0.84% Pb, 0.78% As, and 0.25% Ag). These results corroborate the presence of metallic sulfides such as pyrite, chalcopyrite, and wurtzite; this last species was identified as the matrix of the concentrate by X-ray Diffraction (XRD) and Scanning Electron Microscopy-Energy-Dispersive X-ray Spectroscopy (SEM-EDS). Pourbaix diagrams were constructed for the AgAsS 2 -S 2 O 3 2− -O 2 system at different temperatures, which allowed the chemical reaction of leaching to be established, in addition to determining Eh-pH conditions in which to obtain silver in solution. The highest recoveries of the precious metal (97% Ag) were obtained at a temperature of 333 K and [S 2 O 3 2− ] = 0.5 M. The formation of silver dithiosulfate complex (Ag(S 2 O 3 ) 2 3− ) was confirmed by the characterization of the leach liquors obtained from the experiments performed in the temperature range of 298 to 333 K using Fourier transform infrared spectroscopy (FTIR).

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Section: Discussionmentioning

confidence: 99%

Influence of Temperature on the Formation of Ag Complexed in a S2O32−–O2 System

et al. 2017

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“…The temperature has a favorable effect on the dissolution of silver [13,14] to increase recoveries in a 55.76%.…”

Section: Discussionmentioning

confidence: 99%

Influence of Temperature on the Formation of Ag Complexed in S2O32--O2 System

Ruiz

Juárez

Hernández-Cruz

et al. 2016

Preprint

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Metallic elements of higher economic value occurring in the mineralogy of Zimapán are Pb, Zn, Cu and Fe, said elements are sold as concentrates, which, even after processing, generally include significant concentrations of Mo, Cd, Sb, Ag and As that could recover through different leaching methods. In this work the influence of temperature was studied in the complexation of silver in the S2O3 2--O2 system. Chemical and mineralogical characterization of concentrated Zn from the state of Hidalgo confirmed the presence of the silver contained in a sulfide of silver arsenic (AgAsS2) through the techniques of Atomic Absorption Spectrophotometry (AAS), X-Ray Diffraction (XRD) and Scanning Electron Microscopy-Energy-Dispersive X-Ray Spectroscopy (SEM-EDS). The mineralogical species identified allowed the construction mineralogical species Pourbaix diagrams in the range of 298 K to 333 K, through which the Eh-pH conditions to obtain silver in solution were determined. The formation of Ag(S2O3)2 3-complex was confirmed by characterizing liquors leached using the technique Infrared Spectroscopy Fourier Transform (FTIR).

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“…By substituting this relation in Equation (6) and applying the natural logarithm, we obtained Equation (6). Equation (12) represents a straight line whose slope corresponds to the -Ea/R value, and the ordinate to the origin corresponds to k 0 .…”

Section: Temperature Effectmentioning

confidence: 99%

“…Leaching agents that can substitute cyanide include compounds such as thiocyanate, thiourea and thiosulfate, the last two being the most promising processes, as their application has a lower environmental impact [6][7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%