Gold Extraction from Mulatos Mine Sulfides Concentrate Using Oxidative Acid Pretreatment

Jesus L Valenzuela, Patricia Guerrero Germán, Bracamontes Landavazo Maria de los Angeles, Jose R Parga Torres

Resultado de la investigación: Capítulo del libro/informe/acta de congresoContribución a la conferenciarevisión exhaustiva

Resumen

Currently the gold and silver found in ores with low grade either where they are occluded in the ore, which are known as minerals refractory for its difficulty to extract them, causing that conventional methods of extraction are not economically feasible. Treating to increase the recovery of these values, extraction of gold from refractory of matrix sulfide concentrate was studied, ore samples were collected from Mulatos Mine, located in municipality of Sahuaripa, Sonora, Mexico, for which oxidation takes place in acid medium using ferric sulfate and sulfuric acid as oxidizers (pretreatment), followed by leaching with cyanide. The concentrate has a grade of 97 g/ton Au, 0.25% Cu and 15% Fe. XRD is confirmed the presence of the species of silica and pyrite. In experiments conducted so far was found to be the extraction of gold without using any prior pretreatment as low 24%, while making the acid pretreatment 0.5 M H2SO4 - Fe2(SO4)3 at conditions T = 50° C, PO2 = 0.35 MPa, followed by neutralization with lime and leaching with cyanide (0.5%) NaCN, T=25°C and P= 1 atm. Gold extraction increased to 90%.
Idioma originalInglés estadounidense
Título de la publicación alojadaSME Annual Conference 2019
Subtítulo de la publicación alojadaSME 2019
Lugar de publicaciónDenver, CO, Estados Unidos
EditorialSociety for Mining, Metallurgy and Exploration
CapítuloChemical Processing
Edición2019
EstadoPresentada - 27 feb 2019

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