Efecto sinérgico de tiosulfato de sodio y glicina en la lixiviación de plata, utilizando peróxido de hidrógeno como oxidante y etilenglicol, en una muestra polimetálica de Zimapán: influencia de la temperatura

Juan Miguel Huazo Barrios; Gabriel Cisneros Flores; Julio César  Juárez Tapia; Aislinn Michelle Teja Ruíz; Oscar Javier Hernández Ortiz; Felipe Legorreta García

doi:10.29057/aactm.v11i11.13140

Juan Miguel Huazo Barrios Autonomous University of the State of Hidalgo https://orcid.org/0009-0001-1179-8041
Gabriel Cisneros Flores Universidad Autónoma del Estado de Hidalgo
Julio César Juárez Tapia Autonomous University of the State of Hidalgo https://orcid.org/0000-0001-7058-1670
Aislinn Michelle Teja Ruíz Autonomous University of the State of Hidalgo https://orcid.org/0000-0002-9503-7599
Oscar Javier Hernández Ortiz Autonomous University of the State of Hidalgo https://orcid.org/0000-0002-5805-9035
Felipe Legorreta García Autonomous University of the State of Hidalgo https://orcid.org/0000-0001-6968-199X

DOI: https://doi.org/10.29057/aactm.v11i11.13140

Keywords: Thiosulfate, glycine, silver leaching, copper concentrate

Abstract

The extraction of precious metals such as silver (Ag) from concentrates and other secondary sources has been achieved using eco-friendly systems like thiosulfate-glycine, a viable alternative to cyanide leaching. This study evaluates the interaction between sodium thiosulfate and glycine through UV-vis spectroscopic analysis, showing a change in absorbance at a 1:0.5 ratio. The copper concentrate from the Zimapán mining district was analyzed chemically and mineralogically, confirming its polymetallic composition. Leaching experiments of Ag at various temperatures demonstrated that the system Na₂S₂O₃ – gly – H₂O₂ – EG managed to dissolve 80% of Ag in 90 minutes at 25 °C. The dissolution curve indicates that the interaction between thiosulfate and glycine catalyzes the leaching process, possibly enhanced by the presence of metallic ions in the sample, which could act as additional catalysts.

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