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

*Corresponding author for this work

Research output: Contribution to journalReview articlepeer-review

Abstract

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.

Original languageEnglish
Pages (from-to)153-159
Number of pages7
JournalMINING, METALLURGY AND EXPLORATION
Volume39
Issue number1
DOIs
StatePublished - Feb 2022

Bibliographical note

Publisher Copyright:
© 2021, Society for Mining, Metallurgy & Exploration Inc.

Keywords

  • Adsorption
  • Cyanidation
  • Electrocoagulation
  • Silver

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