Caracterización y modelamiento de arcillas y su impacto en el proceso hidrometalúrgico de mina San Antonio Óxidos, región de Atacama, Chile
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2020
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Universidad Andrés Bello
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La mina San Antonio Óxidos se ubica en la comuna Diego de Almagro, Región de Atacama. Corresponde a tres Pórfidos Cupríferos (35ma) de composición dacítica alineados en sentido Norte-Sur que intruyen una secuencia de rocas sedimentarias calcáreas y volcánicas asignadas a la Formación Asientos y la Formación Pedernales (Jurásico-Cretácico.) El yacimiento posee arcillas/finos que por sus propiedades físicas generan problemas en el procesamiento hidrometalúrgico. El objetivo general es caracterizar y modelar 3D las arcillas y determinar cómo afectan el proceso hidrometalúrgico. El estudio se realizó mediante recopilación de antecedentes, terrenos al rajo y planta hidrometalúrgica, muestreos de rocas para análisis de difractometría de rayos X (DRX), consumo de ácido y cinética de lixiviación, finalmente con información de mapeos geológicos se realiza un modelamiento 3D de la alteración argílica. Con la DRX las principales arcillas identificadas son la Illita, Caolinita, Sepiolita, Halloysita, Pirofilita y Montmorillonita. Del consumo de ácido las arcillas con cobre (115 KgH/Ton) y a la Crisocola (109 KgH/Ton) son las menas con mayor consumo y de las gangas las limonitas (54 KgH/Ton), Estos minerales a partir de mayo 2019 aumentaron gradualmente el consumo de ácido hasta 43 KgH/Ton en el mes de agosto 2019. Las muestras de metasedimento con arcillas con cobre tienen la cinética de lixiviación más baja, además afectaron el %RecCuT en la lixiviación disminuyéndola en un 15% en el mes de mayo 2019.
The San Antonio Óxidos mine is located in the Diego de Almagro commune, Atacama Region. Corresponds to three Cupríferos Porphyry (35ma) of dacitic composition aligned in a North-South direction that intrude a sequence of calcareous and volcanic sedimentary rocks assigned to the Asientos Formation and the Pedernales Formation (Jurassic-Cretaceous.) The deposit has clays / fines that its physical properties create problems in hydrometallurgical processing. The general objective is to characterize and 3D model the clays and determine how they affect the hydrometallurgical process. The study was carried out by means of compilation of antecedents, terrains to the mine and hydrometallurgical plant, rock sampling for analysis of X-ray diffractometry (XRD), acid consumption and leaching kinetics, finally with geological mapping information, a 3D modeling of the argillic alteration is performed. With DRX, the main clays identified are Illita, Kaolinite, Sepiolite, Halloysite, Pyrophyllite and Montmorillonite. From the consumption of acid, clays with copper (115 KgH / Ton) and Chrysocolla (109 KgH / Ton) are the ores with the highest consumption and from bargains Limonites (54 KgH / Ton), These minerals from May 2019 increased Gradually acid consumption up to 43 KgH / Ton in August 2019. Metasediment samples with copper clays have the lowest leaching kinetics, also affected the% RecCuT in leaching, decreasing it by 15% in the month of May 2019.
The San Antonio Óxidos mine is located in the Diego de Almagro commune, Atacama Region. Corresponds to three Cupríferos Porphyry (35ma) of dacitic composition aligned in a North-South direction that intrude a sequence of calcareous and volcanic sedimentary rocks assigned to the Asientos Formation and the Pedernales Formation (Jurassic-Cretaceous.) The deposit has clays / fines that its physical properties create problems in hydrometallurgical processing. The general objective is to characterize and 3D model the clays and determine how they affect the hydrometallurgical process. The study was carried out by means of compilation of antecedents, terrains to the mine and hydrometallurgical plant, rock sampling for analysis of X-ray diffractometry (XRD), acid consumption and leaching kinetics, finally with geological mapping information, a 3D modeling of the argillic alteration is performed. With DRX, the main clays identified are Illita, Kaolinite, Sepiolite, Halloysite, Pyrophyllite and Montmorillonite. From the consumption of acid, clays with copper (115 KgH / Ton) and Chrysocolla (109 KgH / Ton) are the ores with the highest consumption and from bargains Limonites (54 KgH / Ton), These minerals from May 2019 increased Gradually acid consumption up to 43 KgH / Ton in August 2019. Metasediment samples with copper clays have the lowest leaching kinetics, also affected the% RecCuT in leaching, decreasing it by 15% in the month of May 2019.
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Industria Minera, Rocas Sedimentarias, Alteración Argílica, Cinética de Lixiviación, Consumo de Ácido, Impacto Ambiental, Chile