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%.
|Original language||American English|
|Title of host publication||SME Annual Conference 2019|
|Subtitle of host publication||SME 2019|
|Place of Publication||Denver, CO, Estados Unidos|
|Publisher||Society for Mining, Metallurgy and Exploration|
|State||Submitted - 27 Feb 2019|
Valenzuela, J. L., Guerrero Germán, P., Maria de los Angeles, B. L., & Parga Torres, J. R. (2019). Gold Extraction from Mulatos Mine Sulfides Concentrate Using Oxidative Acid Pretreatment. Manuscript submitted for publication. In SME Annual Conference 2019: SME 2019 (2019 ed.).  Society for Mining, Metallurgy and Exploration.