The present study examined a process for precious metals recovery (silver and gold) from difficult minerals which exhibit refractory characteristics to cyanidation and ammonium thiosulfate leaching (low extraction and high consumption of leaching agent). It is well known that mangano-argentiferous minerals are mainly composed of manganese, silver, gold and iron. In this research, a mineral sample from Monte del Favor Mine, located in Hostotipaquillo, Jalisco, Mexico, was physical and chemical characterized by x-ray powder diffraction (XRPD), scanning electron microscopy (SEM), energy-dispersive x-ray spectroscopy (EDS), fire assay and atomic absorption spectroscopy (AAS). Two-stages leaching was carried out, first to eliminate manganese from the sample using sodium sulfite (Na2SO3) as a reductive reagent and sulfuric acid (H2SO4), a second stage to dissolve silver and gold with sodium hypochlorite (NaClO) and hydrochloric acid (HCl), the results shows extraction around 96% for Mn, 98.73% and 83% of Ag and Au respectively. The usefulness of high acidity and Na2SO3 to obtain good results in Mn and Ag leaching are discussed along with the roles that HCl and NaClO play in dissolution of Ag and Au values.
|Translated title of the contribution
|DISOLUCIÓN DE ORO Y PLATA EN MINERALES REFRACATRIOS MANGANO-ARGENTÍFEROS CON ÁCIDO CLORHÍDRICO E HIPOCLORITO DE SODIO
|Number of pages
|MINING, METALLURGY AND EXPLORATION
|Published - 15 Apr 2020