Thermodynamic and Kinetic Study for Silver Recovery by Electrocoagulation Process

Erick Montaño*, Víctor Vázquez, Jesús L. Valenzuela, Guillermo Tiburcio, José Parga, Alejandro Valenzuela, Martin Encinas

*Autor correspondiente de este trabajo

Resultado de la investigación: Contribución a una revistaArtículo de revisiónrevisión exhaustiva

Resumen

Merrill-Crowe is the primary process used for the concentration and purification of silver in a cyanide solution. The Langmuir Adsorption model for silver recovery in a cyanide solution was used for the study. The maximum adsorption capacity was 6.19 mmol/g for silver. This model properly adjusts the experimental results of the adsorption equilibrium with high correlation coefficients, which also favors the formation of a single layer of molecules adsorbed for the silver in the electrocoagulation-generated species. The thermodynamic parameters ΔG, ΔH, and ΔS were estimated, and it was found that the adsorption process is exothermic and spontaneous. For the kinetic study, the Lagergren second-order equation was used to study the adsorption speed. To characterize the solids coming from the electrocoagulation, X-ray diffraction (XRD), and scanning electron microscopy (SEM) with energy-dispersive X-ray spectroscopy (EDX) were used; the results of this study suggest that silver is present in aluminite, hydroniumjarosite, and alunogen.

Idioma originalInglés
Páginas (desde-hasta)153-159
Número de páginas7
PublicaciónMining, Metallurgy and Exploration
Volumen39
N.º1
DOI
EstadoPublicada - feb 2022

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© 2021, Society for Mining, Metallurgy & Exploration Inc.

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