Browsing by Author "Espinoza Sornoza, Karen Daniela"

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    Cuantificación de zinc metálico en residuos de galvanizado mediante absorción atómica y aplicación de un proceso hidrometalúrgico para su recuperación.
    (Universidad de Cuenca. Facultad de Ciencias Químicas, 2026-02-20) Dután Parra, Tamara Elizabeth; Espinoza Sornoza, Karen Daniela; Astudillo Ochoa, Sonia Margoth
    The recovery of zinc from galvanizing slag is emerging as a viable alternative for recovering secondary raw materials. Currently, at the national level, galvanizing companies do not have recovery processes in place, which generates significant economic losses and waste with high metal content that is not utilized. This study aims to apply a hydrometallurgical method to recover the zinc present in the slag from a hot-dip galvanizing company. Initially, the top and bottom dross were quantified using atomic absorption spectroscopy. Acid leaching was performed at concentrations of 15% and 35%, and the solution was subsequently oxidized with hydrogen peroxide. For metal recovery, electrodeposition was performed at a current density of 0.0105 A/cm2, and aliquots were taken during this process for subsequent quantification. The top dross registered 42.30% zinc compared to 37.75% in the bottom dross, opting for the top dross for the recovery process due to its higher metallic zinc content. The leaching reached final pH values of 5 and 2, respectively, for each acid concentration. Electrodeposition yields of 88.46% and 85.23% were obtained, respectively, resulting in a total zinc recovery of 76% and 63%. The proposed hydrometallurgical method confirms its viability for the recovery of metallic zinc from this waste, maximizing its value. This contributes substantially to the circular economy and aligns with sustainable development goals.