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Dissolution of minor sulphides present in a pyritic sludge at pH 3 and 25º C
Cama Robert, Jordi (Consejo Superior de Investigaciones Científicas (Espanya). Institut de Ciències de la Terra Jaume Almera)
Acero Salazar, Patricia (Consejo Superior de Investigaciones Científicas (Espanya). Institut de Ciències de la Terra Jaume Almera)

Date: 2005
Abstract: 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.
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Language: Anglès
Document: Article ; recerca ; Versió publicada
Subject: Pyritic sludge ; Galena ; Sphalerite ; Chalcopyrite ; Dissolution kinetics
Published in: Geologica acta, Vol. 3, Núm. 1 (2005) , p. 15-26, ISSN 1696-5728

Adreça alternativa: https://raco.cat/index.php/GeologicaActa/article/view/82215
Adreça alternativa: https://revistes.ub.edu/index.php/GEOACTA/article/view/105.000001411
DOI: 10.1344/105.000001411


12 p, 1.2 MB

The record appears in these collections:
Articles > Published articles > Geologica acta
Articles > Research articles

 Record created 2012-01-31, last modified 2024-02-20



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