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Thermodynamic and Kinetic Study for Silver Recovery by Electrocoagulation Process

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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.

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Acknowledgements

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.

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Authors and Affiliations

  1. Department of Chemical Engineering and Metallurgy, University of Sonora, Hermosillo, Sonora, Mexico

    Erick Montaño, Víctor Vázquez, Jesús L. Valenzuela, Guillermo Tiburcio, Alejandro Valenzuela & Martin Encinas

  2. Department of Metallurgy and Materials Science, Saltillo Institute of Technology, Saltillo, Coahuila, Mexico

    José Parga

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  1. Erick Montaño
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  2. Víctor Vázquez
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  3. Jesús L. Valenzuela
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  4. Guillermo Tiburcio
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  5. José Parga
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  6. Alejandro Valenzuela
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  7. Martin Encinas
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Correspondence to Erick Montaño.

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Montaño, E., Vázquez, V., Valenzuela, J.L. et al. Thermodynamic and Kinetic Study for Silver Recovery by Electrocoagulation Process. Mining, Metallurgy & Exploration 39, 153–159 (2022). https://doi.org/10.1007/s42461-021-00509-5

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  • DOI: https://doi.org/10.1007/s42461-021-00509-5

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