Lixiviación de concentrados de cobre utilizando NaCI y el cobre soluble aportado por el propio concentrado

Revista de Metalurgia (Impact Factor: 0.36). 01/2005; DOI: 10.3989/revmetalm.2005.v41.i5.228
Source: DOAJ

ABSTRACT Leaching of copper concentrates using cupric chlorocomplexes, generated "in situ" by the reaction between Cu(II), aported by the soluble copper content of the concentrate, and sodium chloride in acid media was studied. The concentrate samples were obtained from mineral processing plants from Antofagasta, Chile. Chemical and mineralogical characterization from original concentrates was made. Typical variables such as chloride concentration, soluble copper concentration, leaching time, solid percentage and temperature were studied. DRX and EDS analyzed some of the residues. The experimental results indicated that it is possible to obtain solutions having high copper content ( 15 to 35 g/l) and 2 to 5 g/l free acid in order to submit this solution directly to a solvent extraction stage. The leaching tests use common reactive and low cost such as sodium chloride and sulfuric acidSe ha estudiado la lixiviación de concentrados de cobre mediante cloro-complejos cúpricos, generados in situ por la reacción entre el Cu(II) procedente del cobre soluble del concentrado y cloruro de sodio en medio ácido. Se utilizaron concentrados de cobre provenientes de faenas mineras de Antofagasta, Chile. Se ha efectuado una caracterización química y mineralógica de los concentrados originales. Se ha estudiado el efecto de las siguientes variables, durante la lixiviación: concentración de cloruro, concentración de cobre soluble, tiempo de lixiviación, porcentaje de sólidos y temperatura. Se han caracterizado los residuos sólidos por DRX y microscopia electrónica. Los resultados experimentales indican que es posible obtener disoluciones con contenidos de cobre entre 15 y 35 g/l y de 2 a 5 g/l de acidez libre, con características adecuadas para entrar a la etapa de extracción por solventes. El procedimiento utiliza, solo, reactivos comunes y de muy bajo costo, como NaCl y ácido sulfúrico diluido. La ventaja de este procedimiento consiste en recuperar, a muy bajo coste, la totalidad del cobre soluble y entre 10 y 15% del cobre de sulfuros. El residuo final podría pasar a la pirometalurgia convencional

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