Dephosphorization of Iron Ore through Bioleaching
Autor(a) principal: | |
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Data de Publicação: | 2016 |
Tipo de documento: | Dissertação |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://hdl.handle.net/10198/13176 |
Resumo: | Phosphorus, as phosphate, is frequently found as a constituent of many of the world iron resources. Phosphorus is an extremely harmful element found in iron ore used as a raw material in the steelmaking process because it will affect the quality of iron and steel products. Allowable phosphorus concentration in high quality steel is usually less than 0.08%. Dephosphorization of iron ore has been studied for a long time. Although there are described physical beneficiation and chemical leaching processes, involving inorganic acids, to reduce phosphorus content of iron ores, these processes have several limitations such as poor recovery, require high energy quantity, capital costs and cause environmental pollution. Use of microorganisms in leaching of mineral ores is gaining importance due to the implementation of stricter environmental rules. Microbes convert metal compounds into their water soluble forms and are biocatalysts of leaching processes. Biotechnology is considered as an eco-friendly, promising, and revolutionary solution to these problems. Microorganisms play a critical role in natural phosphorus cycle and the process of phosphate solubilization by microorganisms has been known for many years. This study was performed to analyze the possibility of using bioleaching as a process for the dephosphorization of an iron ore from Northeast of Portugal. For bioleaching, Acidithiobacillus ferrooxidans bacterium were used. For this study two experiments were done with different conditions, which lasts 6 weeks for first experiment and 5 weeks for second experiment. From the result of these preliminary studies, it was observed that for first experiment 6.2 % and for second experiment 3.7 % of phosphorus was removed from iron ore. |
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Dephosphorization of Iron Ore through BioleachingIron orePhosphorusBioleachingAcidithiobacillus ferrooxidansMinério de ferroFósforoDomínio/Área Científica::Engenharia e Tecnologia::Engenharia QuímicaPhosphorus, as phosphate, is frequently found as a constituent of many of the world iron resources. Phosphorus is an extremely harmful element found in iron ore used as a raw material in the steelmaking process because it will affect the quality of iron and steel products. Allowable phosphorus concentration in high quality steel is usually less than 0.08%. Dephosphorization of iron ore has been studied for a long time. Although there are described physical beneficiation and chemical leaching processes, involving inorganic acids, to reduce phosphorus content of iron ores, these processes have several limitations such as poor recovery, require high energy quantity, capital costs and cause environmental pollution. Use of microorganisms in leaching of mineral ores is gaining importance due to the implementation of stricter environmental rules. Microbes convert metal compounds into their water soluble forms and are biocatalysts of leaching processes. Biotechnology is considered as an eco-friendly, promising, and revolutionary solution to these problems. Microorganisms play a critical role in natural phosphorus cycle and the process of phosphate solubilization by microorganisms has been known for many years. This study was performed to analyze the possibility of using bioleaching as a process for the dephosphorization of an iron ore from Northeast of Portugal. For bioleaching, Acidithiobacillus ferrooxidans bacterium were used. For this study two experiments were done with different conditions, which lasts 6 weeks for first experiment and 5 weeks for second experiment. From the result of these preliminary studies, it was observed that for first experiment 6.2 % and for second experiment 3.7 % of phosphorus was removed from iron ore.O fósforo é um dos elementos mais nocivos na produção de aço: a sua presença em teores elevados torna o aço quebradiço e com fraturas. O teor máximo de fósforo permitido é de aproximadamente 0,08 %. Muitas das atuais fontes mundiais de minério de ferro contêm teores de fósforo superiores a 1 % (m/m), o que as torna inadequadas para a produção de ferro e de aço sem um pré-tratamento de desfosforação. No entanto, as técnicas de desfosforação mais utilizadas (nomeadamente os processos térmicos ou os que envolvem a utilização de ácidos ou bases fortes) têm sido recentemente criticadas, sobretudo pelo seu elevado custo e também por possíveis efeitos prejudiciais do ponto de vista ambiental. Considerando as preocupações ambientais atuais relativas ao processo de separação de fósforo do minério de ferro, torna-se particularmente relevante o estudo de outros processos alternativos que resultem na produção de ferro com teores baixos em fósforo. No processo de biolixiviação os microrganismos, como consequência do seu metabolismo, produzem subprodutos químicos que atacam o minério e permitem a dissolução e remoção seletiva da ganga. Este trabalho teve como objetivo a realização de ensaios preliminares para avaliação da ação do microrganismo Acidithiobacillus ferrooxidans na desfosforação de um minério de ferro proveniente do Nordeste de Portugal. Realizaram-se dois ensaios de biolixiviação à temperatura de 28C, razão sólidos/líquidos de 1/10, tendo o primeiro decorrido durante 42 dias e o segundo durante 28 dias. Ao fim deste período de tempo, a percentagem de fósforo removida no primeiro ensaio foi 6,2% e no segundo foi 3,7%.Queiroz, AnaBiblioteca Digital do IPBMammadov, Kanan2016-09-02T14:33:49Z201620162016-01-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesisapplication/pdfhttp://hdl.handle.net/10198/13176TID:201455102enginfo:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2023-11-21T10:30:59Zoai:bibliotecadigital.ipb.pt:10198/13176Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T23:03:22.290460Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse |
dc.title.none.fl_str_mv |
Dephosphorization of Iron Ore through Bioleaching |
title |
Dephosphorization of Iron Ore through Bioleaching |
spellingShingle |
Dephosphorization of Iron Ore through Bioleaching Mammadov, Kanan Iron ore Phosphorus Bioleaching Acidithiobacillus ferrooxidans Minério de ferro Fósforo Domínio/Área Científica::Engenharia e Tecnologia::Engenharia Química |
title_short |
Dephosphorization of Iron Ore through Bioleaching |
title_full |
Dephosphorization of Iron Ore through Bioleaching |
title_fullStr |
Dephosphorization of Iron Ore through Bioleaching |
title_full_unstemmed |
Dephosphorization of Iron Ore through Bioleaching |
title_sort |
Dephosphorization of Iron Ore through Bioleaching |
author |
Mammadov, Kanan |
author_facet |
Mammadov, Kanan |
author_role |
author |
dc.contributor.none.fl_str_mv |
Queiroz, Ana Biblioteca Digital do IPB |
dc.contributor.author.fl_str_mv |
Mammadov, Kanan |
dc.subject.por.fl_str_mv |
Iron ore Phosphorus Bioleaching Acidithiobacillus ferrooxidans Minério de ferro Fósforo Domínio/Área Científica::Engenharia e Tecnologia::Engenharia Química |
topic |
Iron ore Phosphorus Bioleaching Acidithiobacillus ferrooxidans Minério de ferro Fósforo Domínio/Área Científica::Engenharia e Tecnologia::Engenharia Química |
description |
Phosphorus, as phosphate, is frequently found as a constituent of many of the world iron resources. Phosphorus is an extremely harmful element found in iron ore used as a raw material in the steelmaking process because it will affect the quality of iron and steel products. Allowable phosphorus concentration in high quality steel is usually less than 0.08%. Dephosphorization of iron ore has been studied for a long time. Although there are described physical beneficiation and chemical leaching processes, involving inorganic acids, to reduce phosphorus content of iron ores, these processes have several limitations such as poor recovery, require high energy quantity, capital costs and cause environmental pollution. Use of microorganisms in leaching of mineral ores is gaining importance due to the implementation of stricter environmental rules. Microbes convert metal compounds into their water soluble forms and are biocatalysts of leaching processes. Biotechnology is considered as an eco-friendly, promising, and revolutionary solution to these problems. Microorganisms play a critical role in natural phosphorus cycle and the process of phosphate solubilization by microorganisms has been known for many years. This study was performed to analyze the possibility of using bioleaching as a process for the dephosphorization of an iron ore from Northeast of Portugal. For bioleaching, Acidithiobacillus ferrooxidans bacterium were used. For this study two experiments were done with different conditions, which lasts 6 weeks for first experiment and 5 weeks for second experiment. From the result of these preliminary studies, it was observed that for first experiment 6.2 % and for second experiment 3.7 % of phosphorus was removed from iron ore. |
publishDate |
2016 |
dc.date.none.fl_str_mv |
2016-09-02T14:33:49Z 2016 2016 2016-01-01T00:00:00Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/masterThesis |
format |
masterThesis |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://hdl.handle.net/10198/13176 TID:201455102 |
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http://hdl.handle.net/10198/13176 |
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TID:201455102 |
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eng |
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eng |
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info:eu-repo/semantics/openAccess |
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openAccess |
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application/pdf |
dc.source.none.fl_str_mv |
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Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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RCAAP |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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1799135276710232064 |