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


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
Issue number1
StatePublished - Feb 2022

Bibliographical note

Funding Information:
The authors wish to acknowledge the support provided to this project by the National Council of Science and Technology (CONACYT) and to the Department of Chemical Engineering and Metallurgical of the University of Sonora.

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


  • Adsorption
  • Cyanidation
  • Electrocoagulation
  • Silver


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