Microbial Leaching of Metals

Brandl, Helmut

doi:10.1002/9783527620999.ch8k

Cited by 42 publications

(43 citation statements)

References 144 publications

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“…The main inorganic acid that is found in bioleaching environments is sulfuric acid and it is created by sulphur-oxidizing microorganisms, mainly bacteria from the genus Acidithiobacillus (previously known as Thiobacillus). A series of organic acids are produced by bacterial and fungal metabolism subsequent in organic acidolysis, complex and chelate formation [Brandl 2001]. …”

Section: Mechanisms Of Bioleachingmentioning

confidence: 99%

“…These properties are the following: mineral composition, grain size, surface area, porosity, hydrophobicity, galvanic interactions, and the formation of secondary minerals. Bioleaching techniques have several advantages in comparison to chemical leaching [Krebs et al 1997, Brandl 2001.…”

Section: Mechanisms Of Bioleachingmentioning

confidence: 99%

“…These reactions consist mainly of pyrite oxidation. Therefore pyritic iron (II) is oxidized to iron (III) sulphate according to the following reactions (Bosecker, 1997;Brandl, 2001 …”

Section: Direct Bacterial Leachingmentioning

confidence: 99%

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Coal Enrichment Methods by Using Microorganisms and Their Metabolites

Deska¹,

Głodniok²,

Ulfig³

2018

J. Ecol. Eng.

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The aim of this study is to review the literature on the methods of low-rank coal enrichment by using microorganisms and their metabolites. Effective bio-beneficiation technologies for low-rank coals in the future are also suggested throughout this paper. An extensive literature review highlights recent advances in bio-beneficiation technologies for low rank coals. This paper presents the state of the art in the field of the bio-beneficiation technology -carbon leaching with the aid of microorganisms, especially fungi. The knowledge of the low-rank coals leaching is an important step to meet the carbon eco-requirements and improve the economics of mining companies. There are several reasons to investigate microbial activities towards coal. This paper presents the current state of knowledge concerning bioleaching of coal. Thus, in view of the increasing importance of hard coal as a raw material and energy source, it seems hopeful to study the potential of microorganisms to modify the low-rank coal structure.

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Section: Mechanisms Of Bioleachingmentioning

confidence: 99%

Section: Mechanisms Of Bioleachingmentioning

confidence: 99%

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Coal Enrichment Methods by Using Microorganisms and Their Metabolites

Deska¹,

Głodniok²,

Ulfig³

2018

J. Ecol. Eng.

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“…Nestas primeiras operações comerciais, as pilhas de minério de cobre de baixo teor (0,75% m/v) atingiam 10 metros de altura e o processo ocorria naturalmente a céu aberto, com o rendimento de extração anual de 20 a 25% do cobre residual [9].…”

Section: Breve Histórico 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

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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 ...

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“…Biogenic substances produced include not only organic acids [2], but also chelates, mineral acids, and for certain bacteria, ammonia or amines [3]. The three main mechanisms that can act in the solubilization of metals are: acidolysis, complexolysis and redoxolysis [4].…”

Section: Introductionmentioning

confidence: 99%

Chemoorganotrophic Bioleaching of Olivine for Nickel Recovery

et al. 2014

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Bioleaching of olivine, a natural nickel-containing magnesium-iron-silicate, was conducted by applying chemoorganotrophic bacteria and fungi. The tested fungus, Aspergillus niger, leached substantially more nickel from olivine than the tested bacterium, Paenibacillus mucilaginosus. Aspergillus niger also outperformed two other fungal species: Humicola grisae and Penicillium chrysogenum. Contrary to traditional acid leaching, the microorganisms leached nickel preferentially over magnesium and iron. An average selectivity factor of 2.2 was achieved for nickel compared to iron. The impact of ultrasonic conditioning on bioleaching was also tested, and it was found to substantially increase nickel extraction by A. niger. This is credited to an enhancement in the fungal growth rate, to the promotion of particle degradation, and to the detachment of the stagnant biofilm around the particles. Furthermore, ultrasonic conditioning enhanced the selectivity of A. niger for nickel over iron to a value of 3.5. Pre-carbonating the olivine mineral, to OPEN ACCESSMinerals 2014, 4 554 enhance mineral liberation and change metal speciation, was also attempted, but did not result in improvement as a consequence of the mild pH of chemoorganotrophic bioleaching.

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Microbial Leaching of Metals

Cited by 42 publications

References 144 publications

Coal Enrichment Methods by Using Microorganisms and Their Metabolites

Coal Enrichment Methods by Using Microorganisms and Their Metabolites

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

Chemoorganotrophic Bioleaching of Olivine for Nickel Recovery

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