Biodepression of copper-activated pyrite with acidithiobacillus ferrooxidans in flotation with fresh and seawater
Author
dc.contributor.author
San Martín, Francisca
Author
dc.contributor.author
Valles, Ignacio
Author
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Kracht Gajardo, Willy Andrés
Author
dc.contributor.author
Vargas Valero, José Tomás
Author
dc.contributor.author
Aguilar, Claudio
Admission date
dc.date.accessioned
2022-06-08T17:46:44Z
Available date
dc.date.available
2022-06-08T17:46:44Z
Publication date
dc.date.issued
2021
Cita de ítem
dc.identifier.citation
Minerals 2021, 11, 1039
es_ES
Identifier
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10.3390/min11101039
Identifier
dc.identifier.uri
https://repositorio.uchile.cl/handle/2250/185919
Abstract
dc.description.abstract
Acidithiobacillus ferrooxidans has been shown to be a good depressant of pyrite in freshwater and seawater flotation. However, the effect of these bacteria over copper-activated pyrite has not been studied. At the industrial scale, the activation of pyrite with copper is a common process that occurs because Cu2+ ions, released from other minerals, react with pyrite. This is a problem because Cu2+ ions facilitate the reaction of pyrite with the xanthate collectors, becoming hydrophobic and reaching the froth. In this study, microflotation experiments in a Hallimond tube were conducted to evaluate the depressant effect of A. ferrooxidans over non-activated and Cu-activated pyrite in freshwater and seawater flotation. The experiments were carried out at pH 4, 6, 8, 10 and 12 and pyrite was mixed with CuSO4 at 2.5x10(-5) and 5x10(-5) M in order to activate its surface. Considering the results obtained in the microflotation tests, it is possible to conclude that Acidithiobacillus ferrooxidans is able to depress non-activated and Cu-activated pyrite at the entire pH range studied (4-12) in freshwater. On the other hand, the use of bacteria in flotation with seawater proved to be effective to depress non-activated and Cu-activated pyrite at pH 8 and 10 with better results achieved at pH 10. At this pH, the non-activated pyrite recovery dropped from 96% to 15%, and the recovery of Cu-activated pyrite dropped from 95% to 32% when the activation was carried out at 2.5x10(-5) M, and from 87% to 50% when the activation was conducted at 5x10(-5) M of CuSO4. The XPS analysis showed that chalcopyrite and copper (II) hydroxide were formed on the pyrite surface when it is contacted with CuSO4.
es_ES
Patrocinador
dc.description.sponsorship
Chilean National Agency for Research and Development (ANID)
Comision Nacional de Investigacion Cientifica y Tecnologica (CONICYT)
CONICYT FONDECYT 11200144
Federal Ministry of Education & Research (BMBF) 20150026
Aparece en contenido como:BMBF
ANID/PIA AFB180004
es_ES
Lenguage
dc.language.iso
en
es_ES
Publisher
dc.publisher
MDPI
es_ES
Type of license
dc.rights
Attribution-NonCommercial-NoDerivs 3.0 United States