Extracellular polymeric substances mediate bioleaching/biocorrosion via interfacial processes involving iron(III) ions and acidophilic bacteria

Sand, Wolfgang; Gehrke, T.

doi:10.1016/j.resmic.2005.07.012

Cited by 351 publications

(166 citation statements)

References 30 publications

Supporting

Mentioning

137

Contrasting

Unclassified

Order By: Relevance

“…Significant differences of SOM attachment have been reported in the presence of IOM in a bior multi-specific cultures [5,17,18]. Its presence shapes a progressive reactive surface due to the regenerated Fe 3+ , which accelerates RSS biooxidation and chalcopyrite dissolution [19]. In this work, the EIS also confirms that the SOM+IOM biofilm is electrochemically more active, and that the removal of RSS increases the mixed potential [13].…”

Section: Discussionsupporting

confidence: 69%

Bioelectrochemical Changes during the Early Stages of Chalcopyrite Interaction with Acidithiobacillus Thiooxidans and Leptospirillum sp.

2017

View full text Add to dashboard Cite

Abstract:A bioelectrochemical study of charge transfer in the biofilm-chalcopyrite interface was performed to investigate the effect of surficial reduced sulfur species (RSS), in the form of non-stochiometric compounds or polysulfides (S n 2− ) and elemental sulfur (S 0 ) on a biofilm structure, during the earliest stages (1, 12 and 24 h) of chalcopyrite biooxidation by Acidithiobacillus thiooxidans alone and adding Leptospirillum sp. The surface of massive chalcopyrite electrodes was exposed to the bacteria, which were analyzed electrochemically, spectroscopically, and microscopically. At the studied earlier times, charge transfer and significant differences in the biofilm structure were detected, depending on the presence of Leptospirillum sp. acting on A. thiooxidans biofilms. Such differences were a consequence of a continuous chalcopyrite pitting and promoting changes in biofilm hydrophobicity. A. thiooxidans modifies the reactive properties of RSS and favors an acidic dissolution, which shifts into ferric dissolution when Leptospirillum sp. is present. A. thiooxidans allows H + and Fe 3+ diffusion, and Leptospirillum sp. enables to surpass the charge transfer (reactivity) barrier between the mineral interface and the ions. The observed changes of hydrophobicity on the interface are associated to ions and electrons activity and transfer. Finally, a model of S 0 biooxidation by A. thiooxidans alone or with Leptospirillum sp. is proposed.

show abstract

Section: Discussionsupporting

confidence: 69%

Bioelectrochemical Changes during the Early Stages of Chalcopyrite Interaction with Acidithiobacillus Thiooxidans and Leptospirillum sp.

2017

View full text Add to dashboard Cite

show abstract

“…O enxofre elementar (S 0 ) formado durante a reação também seria oxidado pela ação de micro-organismos com a formação de ácido sulfúrico [12][13][14][15].…”

Section: Mecanismos Da Biolixiviaçãounclassified

Biolixiviação: Uma Avaliação Das Inovações Tecnológicas Na Biomineração De Minerais Sulfetados No Período De 1991 a 2015

Giese¹

2017

Tecnologia Em Metalurgia Materiais E Mineração

View full text Add to dashboard Cite

2176-1523 © ano Associação Brasileira de Metalurgia, Materiais e Mineração. Publicado pela ABM. Este é um artigo de acesso aberto distribuído sob os termos da licença Creative Commons CC BY-NC-ND (Attribution-NonCommercial-NoDerivs) -https:// creativecommons.org/licenses/by-nc-nd/4.0/. a Resumo O desenvolvimento de inovações tecnológicas nos processos de biolixiviação tem sido constante, principalmente, pelo fato dos processos biohidrometalúrgicos oferecerem vantagens frente às plantas convencionais, v. g., a diminuição dos custos operacionais e de geração de resíduos. O objetivo deste trabalho foi avaliar o perfil das competências tecnológicas relacionadas à este processo através do estudo das patentes depositadas na base de dados da Organização Mundial de Propriedade Intelectual (OMPI) nos últimos 25 anos. Observou-se que, entre os anos de 1991 e 2015, cerca de 328 patentes foram depositadas na Patentscope, destacando-se a China e EUA que somados detém igualmente 44% dos registros. A partir dos resultados obtidos nesta pesquisa, foi traçado um paralelo entre os depósitos de patentes e a economia mineral. A análise dos dados obtidos permitiu descrever as tecnologias preferencialmente protegidas dos processos de biolixiviação. Palavras-chave: Bio-hidrometalurgia; Biolixiviação; Patentes. BIOLEACHING: AN EVALUATION OF TECHNOLOGICAL INNOVATIONS ON THE SULPHIDE MINERALS IN THE PERIOD OF 1991 TO 2015 AbstractThe development of technological innovations in bioleaching has been constant, especially, the use of these biohydrometallurgical processes offer advantages over conventional plants, such as lower operating costs and waste generation. The objective of this study was to evaluate the potential of technological competence related to this process through the analysis of patents in the database of the World Intellectual Property Organization (WIPO) in the last 25 years. It was observed that between the years 1991 and 2015, about 328 patents were filed in Patenstcope, especially China and USA which added also holds 44% of the documents. From obtained results, it has drawn a parallel between the patent deposits and the mineral economy. The analysis of the data allowed describing the technologies protected preferably of bioleaching processes. Keywords: Biohydrometallurgy; Bioleaching; Patents. INTRODUÇÃOA cadeia produtiva da metalurgia de minerais não-ferrosos, de maneira geral, envolve processos de concentração (moagem, britagem, flotação e secagem), seguido de pirometalurgia ou hidrometalurgia [1,2]. Todavia, estes processos convencionais não se apresentam economicamente viáveis para a extração de metais a partir de minérios oxidados ou minérios de baixo teor notadamente pelos elevados custos de energia e insumos despendidos [3,4].Em virtude disso, paulatinamente, surgiu a necessidade de se buscar alternativas dentro de um cenário da hidrometalurgia extrativa: a) expectativa com a diminuição dos recursos minerais; b) necessidades comerciais se ampliando devido ao desenvolvimento tecnológico; c) aumento da produção de ...

show abstract

“…46 Strains of A. ferrooxidans with a high amount of ferric ions in extra polymeric substances have higher oxidation activity than those with lower ferric ions. 104,106 If the bacterial activity of oxidation of ferric ions is much higher than their consumption by ore, then each further bacterial activity can be harmful for the process of bioleaching. 107 A specific degree of oxidation of ferrous ions is decreased by the increasie of ferric ions: with the increase of ferric ions in A. ferrooxidans, the ironoxidizing enzyme system is competitively inhibited with ferric ions.…”

Section: Electrochemical Aspects Of the Catalytic Activity Of The Bacmentioning

confidence: 99%

The Catalytic Role of Acidithiobacillus ferrooxidans for Metals Extraction from Mining - Metallurgical Resource

Maluckov

2017

BIJ

View full text Add to dashboard Cite

Extracellular polymeric substances mediate bioleaching/biocorrosion via interfacial processes involving iron(III) ions and acidophilic bacteria

Cited by 351 publications

References 30 publications

Bioelectrochemical Changes during the Early Stages of Chalcopyrite Interaction with Acidithiobacillus Thiooxidans and Leptospirillum sp.

Bioelectrochemical Changes during the Early Stages of Chalcopyrite Interaction with Acidithiobacillus Thiooxidans and Leptospirillum sp.

Biolixiviação: Uma Avaliação Das Inovações Tecnológicas Na Biomineração De Minerais Sulfetados No Período De 1991 a 2015

The Catalytic Role of Acidithiobacillus ferrooxidans for Metals Extraction from Mining - Metallurgical Resource

Contact Info

Product

Resources

About