Thermodynamic and Kinetic Study for Silver Recovery by Electrocoagulation Process

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Merrill-Crowe is the primary process used for the concentration and purifcation 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 coefcients, 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 difraction (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
Translated title of the contributionEstudio Cinético y Termodinámico para Recuperación de Plata por el Proceso de Electrocoagulación
Original languageEnglish
Pages (from-to)01
Number of pages7
Early online date1 Nov 2021
StatePublished - 1 Nov 2021

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