Electrochemical techniques applied to study the oxidative dissolution of the covellite - CuS by Thiobacillus ferrooxidans.
Autor(a) principal: | |
---|---|
Data de Publicação: | 2002 |
Outros Autores: | , , |
Tipo de documento: | Artigo |
Idioma: | por |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://hdl.handle.net/11449/194565 |
Resumo: | Among the copper sulphides, chalcopyrite (CuFeS2,), covellite (CuS) and chalcocite (Cu2S) are the most important source of minerals for copper mining industry. The acknowledge of behaviour of these sulphides related with bacterial leaching process are essential for optimization procedures. Despite of its importance, covellite has not deserved much interest of researcher regarding this matter. In this work it was studied the oxidation of covellite by the chemolithotrophic bacterium Thiobacillus ferrooxidans by using electrochemical techniques, such as open circuit potentials with the time and cyclic voltammetry. The experiments were carried out in acid medium (pH 1.8). containing or not Fe2+ as additional energy source, and in different periods, of incubation chemical controls were run in parallel. The results showed that a sulphur layer is formed spontaneously due the acid attack, covering the sulphide in the initial phase of incubation, blocking the sulphide oxidation. However, the bacterium was capable to oxidize this sulphur layer. In the presence of Fe2+ as supplemental energy source, the corrosion process was facilitated, because ocurred an indirect oxidation of covellite by Fe3+, which was produced by T ferrooxidans oxidation of the Fe2+ added in the medium. |
id |
UNSP_74e82c75d4697d967b8a6c71e47e4785 |
---|---|
oai_identifier_str |
oai:repositorio.unesp.br:11449/194565 |
network_acronym_str |
UNSP |
network_name_str |
Repositório Institucional da UNESP |
repository_id_str |
2946 |
spelling |
Electrochemical techniques applied to study the oxidative dissolution of the covellite - CuS by Thiobacillus ferrooxidans.Thiobacillus ferrooxidansbioteachingelectrochemical techniquesAmong the copper sulphides, chalcopyrite (CuFeS2,), covellite (CuS) and chalcocite (Cu2S) are the most important source of minerals for copper mining industry. The acknowledge of behaviour of these sulphides related with bacterial leaching process are essential for optimization procedures. Despite of its importance, covellite has not deserved much interest of researcher regarding this matter. In this work it was studied the oxidation of covellite by the chemolithotrophic bacterium Thiobacillus ferrooxidans by using electrochemical techniques, such as open circuit potentials with the time and cyclic voltammetry. The experiments were carried out in acid medium (pH 1.8). containing or not Fe2+ as additional energy source, and in different periods, of incubation chemical controls were run in parallel. The results showed that a sulphur layer is formed spontaneously due the acid attack, covering the sulphide in the initial phase of incubation, blocking the sulphide oxidation. However, the bacterium was capable to oxidize this sulphur layer. In the presence of Fe2+ as supplemental energy source, the corrosion process was facilitated, because ocurred an indirect oxidation of covellite by Fe3+, which was produced by T ferrooxidans oxidation of the Fe2+ added in the medium.Univ Estadual Paulista, Inst Quim, BR-14801970 Ararquara, SP, BrazilUniv Estadual Paulista, Inst Quim, BR-14801970 Ararquara, SP, BrazilSoc Brasileira QuimicaUniversidade Estadual Paulista (Unesp)Teixeira, C. M.Ramires, IGarcia, O.Guastaldi, A. C.2020-12-10T16:30:10Z2020-12-10T16:30:10Z2002-01-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article20-26Quimica Nova. Sao Paulo: Soc Brasileira Quimica, v. 25, n. 1, p. 20-26, 2002.0100-4042http://hdl.handle.net/11449/194565WOS:000173582200005Web of Sciencereponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPporQuimica Novainfo:eu-repo/semantics/openAccess2021-10-22T17:35:50Zoai:repositorio.unesp.br:11449/194565Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T20:26:20.919340Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
Electrochemical techniques applied to study the oxidative dissolution of the covellite - CuS by Thiobacillus ferrooxidans. |
title |
Electrochemical techniques applied to study the oxidative dissolution of the covellite - CuS by Thiobacillus ferrooxidans. |
spellingShingle |
Electrochemical techniques applied to study the oxidative dissolution of the covellite - CuS by Thiobacillus ferrooxidans. Teixeira, C. M. Thiobacillus ferrooxidans bioteaching electrochemical techniques |
title_short |
Electrochemical techniques applied to study the oxidative dissolution of the covellite - CuS by Thiobacillus ferrooxidans. |
title_full |
Electrochemical techniques applied to study the oxidative dissolution of the covellite - CuS by Thiobacillus ferrooxidans. |
title_fullStr |
Electrochemical techniques applied to study the oxidative dissolution of the covellite - CuS by Thiobacillus ferrooxidans. |
title_full_unstemmed |
Electrochemical techniques applied to study the oxidative dissolution of the covellite - CuS by Thiobacillus ferrooxidans. |
title_sort |
Electrochemical techniques applied to study the oxidative dissolution of the covellite - CuS by Thiobacillus ferrooxidans. |
author |
Teixeira, C. M. |
author_facet |
Teixeira, C. M. Ramires, I Garcia, O. Guastaldi, A. C. |
author_role |
author |
author2 |
Ramires, I Garcia, O. Guastaldi, A. C. |
author2_role |
author author author |
dc.contributor.none.fl_str_mv |
Universidade Estadual Paulista (Unesp) |
dc.contributor.author.fl_str_mv |
Teixeira, C. M. Ramires, I Garcia, O. Guastaldi, A. C. |
dc.subject.por.fl_str_mv |
Thiobacillus ferrooxidans bioteaching electrochemical techniques |
topic |
Thiobacillus ferrooxidans bioteaching electrochemical techniques |
description |
Among the copper sulphides, chalcopyrite (CuFeS2,), covellite (CuS) and chalcocite (Cu2S) are the most important source of minerals for copper mining industry. The acknowledge of behaviour of these sulphides related with bacterial leaching process are essential for optimization procedures. Despite of its importance, covellite has not deserved much interest of researcher regarding this matter. In this work it was studied the oxidation of covellite by the chemolithotrophic bacterium Thiobacillus ferrooxidans by using electrochemical techniques, such as open circuit potentials with the time and cyclic voltammetry. The experiments were carried out in acid medium (pH 1.8). containing or not Fe2+ as additional energy source, and in different periods, of incubation chemical controls were run in parallel. The results showed that a sulphur layer is formed spontaneously due the acid attack, covering the sulphide in the initial phase of incubation, blocking the sulphide oxidation. However, the bacterium was capable to oxidize this sulphur layer. In the presence of Fe2+ as supplemental energy source, the corrosion process was facilitated, because ocurred an indirect oxidation of covellite by Fe3+, which was produced by T ferrooxidans oxidation of the Fe2+ added in the medium. |
publishDate |
2002 |
dc.date.none.fl_str_mv |
2002-01-01 2020-12-10T16:30:10Z 2020-12-10T16:30:10Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
Quimica Nova. Sao Paulo: Soc Brasileira Quimica, v. 25, n. 1, p. 20-26, 2002. 0100-4042 http://hdl.handle.net/11449/194565 WOS:000173582200005 |
identifier_str_mv |
Quimica Nova. Sao Paulo: Soc Brasileira Quimica, v. 25, n. 1, p. 20-26, 2002. 0100-4042 WOS:000173582200005 |
url |
http://hdl.handle.net/11449/194565 |
dc.language.iso.fl_str_mv |
por |
language |
por |
dc.relation.none.fl_str_mv |
Quimica Nova |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
20-26 |
dc.publisher.none.fl_str_mv |
Soc Brasileira Quimica |
publisher.none.fl_str_mv |
Soc Brasileira Quimica |
dc.source.none.fl_str_mv |
Web of Science reponame:Repositório Institucional da UNESP instname:Universidade Estadual Paulista (UNESP) instacron:UNESP |
instname_str |
Universidade Estadual Paulista (UNESP) |
instacron_str |
UNESP |
institution |
UNESP |
reponame_str |
Repositório Institucional da UNESP |
collection |
Repositório Institucional da UNESP |
repository.name.fl_str_mv |
Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP) |
repository.mail.fl_str_mv |
|
_version_ |
1808129202247958528 |