Chalcopyrite dissolution rate law from pH 1 to 3

Chalcopyrite dissolution rate law from pH 1 to 3

9 pages, 3 figures, 4 tables.-- Printed version published Sep 2009.

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Main Authors: Acero, Patricia, Cama, Jordi, Ayora, Carlos, Asta, M. P.
Format: artículo biblioteca
Language:English
Published: Universidad de Barcelona 2009-06
Subjects:Acid mine drainage, Kinetics, Flow-through, Sulfides,
Online Access:http://hdl.handle.net/10261/28983
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spelling dig-idaea-es-10261-289832021-07-22T08:51:09Z Chalcopyrite dissolution rate law from pH 1 to 3 Acero, Patricia Cama, Jordi Ayora, Carlos Asta, M. P. Acid mine drainage Kinetics Flow-through Sulfides 9 pages, 3 figures, 4 tables.-- Printed version published Sep 2009. Chalcopyrite dissolution kinetics in the pH range of 1 to 3 were studied by means of long-term flow-through experiments to obtain a dissolution rate law which can be coupled with reactive transport models to forecast Acid Rock Drainage. In the range of conditions under study, the rate of chalcopyrite dissolution is only slightly dependent on hydrogen ion activity, increasing with decreasing pH. The steady-state dissolution rates obtained in the present study were combined with earlier results presented by Acero et al. (2007a) to obtain the following expression for chalcopyrite dissolution rate law. Where Rchalcopyrite is the chalcopyrite issolution rate (mol m-2 s-1), aH+ is the activity of hydrogen ion in solution, R is the gas constant (kJ mol-1 K-1) and T is the temperature (K). This expression can applied through a wide range of environmental conditions similar to the ones found in systems affected by acid drainage. In agreement with earlier chalcopyrite kinetic studies, iron was released to solution preferentially over copper and sulfur, compared with the stoichiometry of the pristine mineral. Consistently, XPS examination of the samples showed that reacted surfaces were enriched in sulfur and copper (relative to iron) compared with the initial, pristine chalcopyrite surface. However, this surface layer does not exert any passivating effect on chalcolpyrite dissolution and the kinetics of the overall process in the long term seems to be surface-controlled. This work was funded by the Research and Development Contracts CTM2006-28151-E/TECNO and CTM2007-66724-C02-01/TECNO. Patricia Acero was also supported by a grant from the Spanish Government. Peer reviewed 2010-11-10T11:06:17Z 2010-11-10T11:06:17Z 2009-06 artículo http://purl.org/coar/resource_type/c_6501 Geologica Acta 7(3): 389-397 (2009) 1695-6133 http://hdl.handle.net/10261/28983 10.1344/105.000001444 en http://dx.doi.org/10.1344/105.000001444 open Universidad de Barcelona
institution IDAEA ES
collection DSpace
country España
countrycode ES
component Bibliográfico
access En linea
databasecode dig-idaea-es
tag biblioteca
region Europa del Sur
libraryname Biblioteca del IDAEA España
language English
topic Acid mine drainage
Kinetics
Flow-through
Sulfides
Acid mine drainage
Kinetics
Flow-through
Sulfides
spellingShingle Acid mine drainage
Kinetics
Flow-through
Sulfides
Acid mine drainage
Kinetics
Flow-through
Sulfides
Acero, Patricia
Cama, Jordi
Ayora, Carlos
Asta, M. P.
Chalcopyrite dissolution rate law from pH 1 to 3
description 9 pages, 3 figures, 4 tables.-- Printed version published Sep 2009.
format artículo
topic_facet Acid mine drainage
Kinetics
Flow-through
Sulfides
author Acero, Patricia
Cama, Jordi
Ayora, Carlos
Asta, M. P.
author_facet Acero, Patricia
Cama, Jordi
Ayora, Carlos
Asta, M. P.
author_sort Acero, Patricia
title Chalcopyrite dissolution rate law from pH 1 to 3
title_short Chalcopyrite dissolution rate law from pH 1 to 3
title_full Chalcopyrite dissolution rate law from pH 1 to 3
title_fullStr Chalcopyrite dissolution rate law from pH 1 to 3
title_full_unstemmed Chalcopyrite dissolution rate law from pH 1 to 3
title_sort chalcopyrite dissolution rate law from ph 1 to 3
publisher Universidad de Barcelona
publishDate 2009-06
url http://hdl.handle.net/10261/28983
work_keys_str_mv AT aceropatricia chalcopyritedissolutionratelawfromph1to3
AT camajordi chalcopyritedissolutionratelawfromph1to3
AT ayoracarlos chalcopyritedissolutionratelawfromph1to3
AT astamp chalcopyritedissolutionratelawfromph1to3
_version_ 1777669191422181376

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