Speciation and leachability of copper in mine tailings from porphyry copper mining: influence of particle size.
Chemosphere
; 60(10): 1497-503, 2005 Sep.
Article
em En
| MEDLINE
| ID: mdl-16054920
Mine tailing from the El Teniente-Codelco copper mine situated in VI Region of Chile was analysed in order to evaluate the mobility and speciation of copper in the solid material. Mine tailing was sampled after the rougher flotation circuits, and the copper content was measured to 1150 mg kg (-1) dry matter. This tailing was segmented into fractions of different size intervals: 0-38, 38-45, 45-53, 53-75, 75-106, 106-150, 150-212, and >212 microm, respectively. Copper content determination, sequential chemical extraction, and desorption experiments were carried out for each size interval in order to evaluate the speciation of copper. It was found that the particles of smallest size contained 50-60% weak acid leachable copper, whereas only 32% of the copper found in largest particles could be leached in weak acid. Copper oxides and carbonates were the dominating species in the smaller particles, and the larger particles contained considerable amounts of sulphides.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Sulfetos
/
Poluentes Químicos da Água
/
Cobre
/
Resíduos Industriais
/
Mineração
Idioma:
En
Revista:
Chemosphere
Ano de publicação:
2005
Tipo de documento:
Article
País de afiliação:
Chile
País de publicação:
Reino Unido