Resumo

COS CASTILLO, Claudia Emilia  e  FUENTES ACEITUNO, Juan Carlos. Comprehensive Analysis of the Dissolution of Precious Metals with Innovative Amine-Based Leaching Systems. Epistemus (Sonora) [online]. 2023, vol.17, n.34, pp.32-40.  Epub 08-Dez-2023. ISSN 2007-8196.  https://doi.org/10.36790/epistemus.v17i34.267.

In this research work, novel amine-based leaching systems monoethanolamine (MEA) and ethylamine (EA) were studied from an electrochemical approach to improve the understanding of the dissolution reaction mechanism of precious metals, i.e., gold and silver. The effect of MEA and EA concentration on the oxidation rate of precious metals is presented. The study is complemented with electrochemical techniques such as: open circuit potential technique (OCP), linear voltammetry (VL) and chronoamperometry. The results show that these amines have a great potential in dissolving Au and Ag since average current densities of 0.008 and 0.013 A/cm2 are reached using the MEA, and 0.023 and 0.029 A/cm2 using the EA, respectively. Furthermore, the results indicate that both MEA and EA could decrease the environmental impact involved in hydrometallurgical processes.

Palavras-chave : Monoethanolamine; ethylamine; oxidation; leaching.

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