English   español  
Por favor, use este identificador para citar o enlazar a este item: http://hdl.handle.net/10261/5013
Compartir / Impacto:
Estadísticas
Add this article to your Mendeley library MendeleyBASE
Ver citas en Google académico
Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL
Exportar otros formatos: Exportar EndNote (RIS)Exportar EndNote (RIS)Exportar EndNote (RIS)
Título : Dissolution of minor sulphides present in a pyritic sludge at pH 3 and 25º C
Autor : Acero, P.; Cama, Jordi
Palabras clave : Pyrotic sludge
Galena
Sphalerite
Chalcopyrite
Dissolution kinetics
Fecha de publicación : 2005
Editor: CSIC - Instituto de Ciencias de la Tierra Jaume Almera (ICTJA)
Citación : Geologica acta: an international earth science journal , Vol. 3, Nº. 1, 2005 , pags. 15-26
Resumen: The steady-state dissolution rates of galena, sphalerite and chalcopyrite at pH 3 under oxygen saturated atmosphere and at 25ºC are obtained by means of non-stirred flow-through experiments. These dissolution rates are compared with those estimated by dissolving pyritic sludge from the Aznalcollar mining tailings composed of pyrite and minor sulphides galena, sphalerite and chalcopyrite.Based on the respective release of Fe, Pb, Zn and Cu, the steady-state dissolution rates of pyrite (RateFe), galena (RatePb), sphalerite (RateZn) and chalcopyrite (RateCu) are 6.33 ± 0.95 x 10-11, 1.2 ± 0.18x10-10, 1.3 ± 0.20x10-11 and 1.71 ± 0.25x10-11 mol m-2 s-1, respectively, yielding RatePb > RateFe > RateZn = RateCu. Based on the release of metal and sulphur to solution, the stoichiometric ratios Pb/S, Zn/S and Cu/S are 4 ± 0.25, 1.2 ± 0.1 and 0.90 ± 0.05 for the respective dissolution reactions of galena, sphalerite and chalcopyrite, which are higher than the ideal ones. These high values result from a sulphur deficit in the output solutions attributed to the loss of H2S(aq) via gasification by which H2S(aq) partially converts to H2S(g). Nevertheless, the Cu/Fe ratio is 0.95 ± 0.05 during chalcopyrite dissolution at steady state, suggesting that chalcopyrite dissolves stoichiometrically.
URI : http://hdl.handle.net/10261/5013
ISSN: 1695-6133
Aparece en las colecciones: (ICTJA) Artículos
Ficheros en este ítem:
Fichero Descripción Tamaño Formato  
1102785[1].pdf769,54 kBAdobe PDFVista previa
Visualizar/Abrir
Mostrar el registro completo
 


NOTA: Los ítems de Digital.CSIC están protegidos por copyright, con todos los derechos reservados, a menos que se indique lo contrario.