Obtención del cobre
Los minerales mas utilizados para obtener cobre son sulfuros de cobre, especialmente la calcopirita . También existen minerales de óxido de cobre, destacando la malaquita y la cuprita. Los minerales de cobre suelen ira acompañados también de hierro. Existen dos métodos de obtención del cobre - La vía húmeda - La vía seca Vía húmeda: Se emplea solamente cuando el contenido de cobre en el mineral es muy reducido (menos de un 10%). Consiste en triturar todo el mineral y añadirle ácido sulfúrico y aplicar a la mezcla el proceso de electrólisis (es decir, aplicar una corriente continua introduciendo dos electrodos en la mezcla). Vía seca: Se emplea solamente cuando el contenido de cobre supera el 10%. Consta de las siguientes fases 1. Se tritura el mineral, se criba y se muele hasta reducirlo a polvo. 2. Se introduce en un recipiente con agua abundante, donde se agita para eliminar la ganga que
flota. 3. La mena que quede se lleva a un horno de pisos donde se oxida para eliminar el hierro presente. De este modo se separa el cobre del hierro 4. A continuación se introduce el mineral de cobre en un horno donde se funde. Luego se añade sílice y cal que reaccionan con el azufre y restos de hierro, formando la escoria que flota y se elimina. El cobre líquido que se encuentra debajo se denomina cobre bruto, cuya pureza es del 40%. 5. Por último, para obtener un cobre de alta pureza se somete el líquido a un proceso electrolítico . El cobre tendrá una pureza del 99,9%. Aplicaciones del cobre
Su principal aplicación es como conductor eléctrico. Pues su ductilidad le permite transformarlo en cables de cualquier diámetro. Por su alta resistencia a la oxidación se emplea en instalaciones de fontanería, tuberías y calderas.
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horno de reverbero que produce cobre metálico en bruto con una pureza aproximada del 98%. Este cobre en bruto se purifica por electrólisis, obteniéndose barras con una pureza que supera el 99,9 por ciento.
Azurita, mineral azul de fórmula Cu 3(OH)2(CO3)2, también llamado malaquita azul. Está estrechamente relacionada con la malaquita mineral, Cu 2(OH)2CO3, de color verde, aunque esta última es algo más básica. Ambas son carbonatos de cobre básicos, productos de otros minerales con cobre, formadas por la acción corrosiva del aire y el agua. Son similares a la pátina o verdín que se forma sobre el cobre ordinario. Se encuentran juntos en Chessy, cerca de Lyon en Francia; en los Urales de Rusia; en Australia; y en Arizona en Estados Unidos. Tanto la azurita como la malaquita son menas importantes de cobre. La dureza de ambas está entre 3,5 y 4, la densidad relativa de la azurita es 3,8 y la de la malaquita 4,0.
La azurita y la malaquita han sido usadas como pigmentos; cuando se muelen, la azurita toma un color azul verdoso y la malaquita un verde intenso. Ambos minerales tienen un delicado brillo vidrioso y cuando se pulen convenientemente son muy decorativos. Desde la antigüedad se han usado extensamente como gemas.
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La conminución comienza con el chancado primario de grandes trozos de mineral por acción de fuerzas de compresión. Como el producto generado tiene un tamaño demasiado grande para el tratamiento metalúrgico de concentración, se hace necesario etapas posteriores de molienda, con el objeto de obtener un t amaño optimo. Trituración.
Las trituradoras son maquinas de trabajo pesado, usadas par reducir la MENA hasta un tamaño apropiado para la alimentación del proceso. Las trituradoras constan de dos placas que se cierran como mandíbulas de animal; una de las quijadas esta fija y otra es movible.
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MOLIENDA. Última etapa de la conminucion de las partículas del mineral ya sea por impacto, cincelado y abrasión; en seco o en suspensión en agua, esto se realiza en recipientes cilíndricos rotatorios: MOLINOS DE RODAMIENTO DE CARGA, los cuales contienen cuerpos de trituración para pulverizar las partículas de la mena. En el proceso de molienda las partículas de5 y 250 mm, se reducen entre 10 y 300μm.+
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Concentración:
El cobre está presente en la corteza terrestre en forma de minerales sulfurados y oxidados, teniendo para cada uno dos vías de tratamiento; el tratamiento pirometalúrgico para los sulfuros y tratamiento hidrometalúrgico para los óxidos. Concentración por Flotación
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Pocas partículas minerales tienen flotabilidad natural, es decir, formar una unión estable burbuja-partícula. Para ello, es necesario cambiar las propiedades superficiales de las partículas minerales de hidrofílicas a hidrofóbicas mediante el uso de un reactivo químico llamado colector. También es necesario que éstas posean el tamaño adecuado de tal forma que asegure una buena liberación de las especies minerales. Entre los reactivos principales tenemos: Colectores: proporcionan propiedades hidrofóbicas a las especies minerales
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