Obtenção e caracterização de cimentos sulfobelíticos sintetizados a partir do resíduo de bauxita
Autor(a) principal: | |
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Data de Publicação: | 2013 |
Tipo de documento: | Dissertação |
Idioma: | por |
Título da fonte: | Repositório Institucional da UFSCAR |
Texto Completo: | https://repositorio.ufscar.br/handle/ufscar/909 |
Resumo: | The modern society has an elevated and increasingly pattern of consumption, demanding a high industrial productivity and generating enormous residue volumes, resulting in a conduct that is becoming each time more unsustainable. The bauxite residue (BR), also known as red mud, is the residue of biggest generation by the aluminum industry, being stocked in large impermeable deposits, being this way the passive of the highest management cost for this industrial sector. Only in Brazil the minimum estimative of BR generation is of 10.7 million tons/year. Nevertheless, the BR, although alkaline, is composed by fine particles rich in iron, aluminum and silicon oxides, consisting therefore in a raw material of possible interests for many applications in traditional ceramics, mainly in civil construction. In this alternative, the use of BR, as a raw material, in the development of new sulfobelite cements for civil construction shows itself very attractive. These cements are characterized by the calcium sulfoaluminate phase (C4A3S), higher contents of belite (β-C2S) and calcium ferrialuminate (C4AF), as well as the absence of alite (C3S). Due to this composition these cements have been showing economic-environmental, and possibly even technical, advantages over Portland cement. From their benefits, highlights a reduction of 30% to 62% on equivalent CO2 emissions, as for less limestone used, as well as, lower burning temperature, bringing also energy reduction in the process. The sulfobelite clinker was synthesized using the raw materials: limestone, commercial gypsum, BR and São Simão clay. Using expressive BR content, up to 11.2wt%; understanding the influence of Al2O3/Fe2O3 (A/F) ratio; and gypsum additions; for the synthesis of sulfobelite cements it was possible to develop satisfactory formulations. These sulfobelite cement formulations presented apparent porosity and mechanical strength equivalent to commercial Portland cement (CPII-Z32 and CPV-ARI), else than the formation of hydration products similar to a commercial calcium sulfoaluminato cement. |
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Fortes, Gustavo MattosRodrigues, José de Anchietahttp://genos.cnpq.br:12010/dwlattes/owa/prc_imp_cv_int?f_cod=K4783623T3http://lattes.cnpq.br/7377968371938316da6a2e08-37c4-4a64-ab70-3729a9ac9dd42016-06-02T19:12:31Z2013-10-172016-06-02T19:12:31Z2013-03-18https://repositorio.ufscar.br/handle/ufscar/909The modern society has an elevated and increasingly pattern of consumption, demanding a high industrial productivity and generating enormous residue volumes, resulting in a conduct that is becoming each time more unsustainable. The bauxite residue (BR), also known as red mud, is the residue of biggest generation by the aluminum industry, being stocked in large impermeable deposits, being this way the passive of the highest management cost for this industrial sector. Only in Brazil the minimum estimative of BR generation is of 10.7 million tons/year. Nevertheless, the BR, although alkaline, is composed by fine particles rich in iron, aluminum and silicon oxides, consisting therefore in a raw material of possible interests for many applications in traditional ceramics, mainly in civil construction. In this alternative, the use of BR, as a raw material, in the development of new sulfobelite cements for civil construction shows itself very attractive. These cements are characterized by the calcium sulfoaluminate phase (C4A3S), higher contents of belite (β-C2S) and calcium ferrialuminate (C4AF), as well as the absence of alite (C3S). Due to this composition these cements have been showing economic-environmental, and possibly even technical, advantages over Portland cement. From their benefits, highlights a reduction of 30% to 62% on equivalent CO2 emissions, as for less limestone used, as well as, lower burning temperature, bringing also energy reduction in the process. The sulfobelite clinker was synthesized using the raw materials: limestone, commercial gypsum, BR and São Simão clay. Using expressive BR content, up to 11.2wt%; understanding the influence of Al2O3/Fe2O3 (A/F) ratio; and gypsum additions; for the synthesis of sulfobelite cements it was possible to develop satisfactory formulations. These sulfobelite cement formulations presented apparent porosity and mechanical strength equivalent to commercial Portland cement (CPII-Z32 and CPV-ARI), else than the formation of hydration products similar to a commercial calcium sulfoaluminato cement.A sociedade moderna tem um elevado e crescente padrão de consumo, demandando alta produtividade industrial e gerando enormes volumes de resíduos, resultando em uma conduta que vêm se tornando cada vez mais insustentável. O resíduo de bauxita (RB), também conhecido por lama vermelha, é o resíduo da indústria do alumínio de maior geração que é estocado em grandes depósitos impermeáveis, tornando-se assim o passivo de gerenciamento mais caro para essa indústria. Somente no Brasil a estimativa mínima de geração do RB é de 10,7 milhões de toneladas/ano. Contudo, o RB, apesar de ser alcalino, é composto de finas partículas ricas em óxidos de ferro, alumínio e silício, constituindo assim uma matéria-prima possivelmente interessante para diversas aplicações em produtos cerâmicos tradicionais, sobretudo na construção civil. Dentro desta alternativa, o uso de RB, como matéria-prima, no desenvolvimento de novos cimentos sulfobelíticos para a construção civil se mostra bastante atrativo. Estes cimentos se caracterizam pela fase de sulfoaluminato de cálcio (C4A3S), maiores teores de belita (β-C2S) e ferroaluminato de cálcio (C4AF), assim como a ausência de alita (C3S). Decorrente desta composição estes cimentos têm apresentado vantagens econômico-ambientais e possivelmente até técnicas, quando comparados ao cimento Portland. Dentre estes benefícios, destaca-se a redução de 30% a 62% na emissão de CO2-equivalente, tanto pelo menor uso de calcário como pela menor temperatura de queima, trazendo também economia energética ao processo. O clínquer sulfobelítico foi sintetizado empregando as matérias-primas: calcário calcítico, gesso comercial, RB e argila São Simão. Utilizando teores expressivos de RB, de até 11,2%-p; compreendendo a influência da relação Al2O3/Fe2O3 (A/F); e adições de gesso; para a síntese do cimento sulfobelítico, foi possível desenvolver formulações satisfatórias. Estas formulações de cimento sulfobelítico apresentaram, porosidade aparente e resistência mecânica equivalentes a cimentos Portland comerciais (CPII-Z32 e CPV-ARI), além da formação de produtos de hidratação semelhante ao um cimento de sulfoaluminato de cálcio comercial.Universidade Federal de Sao Carlosapplication/pdfporUniversidade Federal de São CarlosPrograma de Pós-Graduação em Ciência e Engenharia de Materiais - PPGCEMUFSCarBRCimentoCimentos especiaisCimentos sulfobelíticosLama vermelhaResíduo de bauxitaSulfoaluminato de cálcioENGENHARIAS::ENGENHARIA DE MATERIAIS E METALURGICAObtenção e caracterização de cimentos sulfobelíticos sintetizados a partir do resíduo de bauxitaSynthesis and characterization of sulfobelitic cements made with red mud abstractinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesis-1-1eeac44e3-9996-464a-9f4c-724ff89d3f23info:eu-repo/semantics/openAccessreponame:Repositório Institucional da UFSCARinstname:Universidade Federal de São Carlos (UFSCAR)instacron:UFSCARORIGINAL5513.pdfapplication/pdf6669957https://repositorio.ufscar.br/bitstream/ufscar/909/1/5513.pdf9c1ffbe8118424982113968037eabd18MD51TEXT5513.pdf.txt5513.pdf.txtExtracted texttext/plain0https://repositorio.ufscar.br/bitstream/ufscar/909/2/5513.pdf.txtd41d8cd98f00b204e9800998ecf8427eMD52THUMBNAIL5513.pdf.jpg5513.pdf.jpgIM Thumbnailimage/jpeg6161https://repositorio.ufscar.br/bitstream/ufscar/909/3/5513.pdf.jpg5077cf111b1912b33b08926cbbb92e56MD53ufscar/9092023-09-18 18:31:28.308oai:repositorio.ufscar.br:ufscar/909Repositório InstitucionalPUBhttps://repositorio.ufscar.br/oai/requestopendoar:43222023-09-18T18:31:28Repositório Institucional da UFSCAR - Universidade Federal de São Carlos (UFSCAR)false |
dc.title.por.fl_str_mv |
Obtenção e caracterização de cimentos sulfobelíticos sintetizados a partir do resíduo de bauxita |
dc.title.alternative.eng.fl_str_mv |
Synthesis and characterization of sulfobelitic cements made with red mud abstract |
title |
Obtenção e caracterização de cimentos sulfobelíticos sintetizados a partir do resíduo de bauxita |
spellingShingle |
Obtenção e caracterização de cimentos sulfobelíticos sintetizados a partir do resíduo de bauxita Fortes, Gustavo Mattos Cimento Cimentos especiais Cimentos sulfobelíticos Lama vermelha Resíduo de bauxita Sulfoaluminato de cálcio ENGENHARIAS::ENGENHARIA DE MATERIAIS E METALURGICA |
title_short |
Obtenção e caracterização de cimentos sulfobelíticos sintetizados a partir do resíduo de bauxita |
title_full |
Obtenção e caracterização de cimentos sulfobelíticos sintetizados a partir do resíduo de bauxita |
title_fullStr |
Obtenção e caracterização de cimentos sulfobelíticos sintetizados a partir do resíduo de bauxita |
title_full_unstemmed |
Obtenção e caracterização de cimentos sulfobelíticos sintetizados a partir do resíduo de bauxita |
title_sort |
Obtenção e caracterização de cimentos sulfobelíticos sintetizados a partir do resíduo de bauxita |
author |
Fortes, Gustavo Mattos |
author_facet |
Fortes, Gustavo Mattos |
author_role |
author |
dc.contributor.authorlattes.por.fl_str_mv |
http://lattes.cnpq.br/7377968371938316 |
dc.contributor.author.fl_str_mv |
Fortes, Gustavo Mattos |
dc.contributor.advisor1.fl_str_mv |
Rodrigues, José de Anchieta |
dc.contributor.advisor1Lattes.fl_str_mv |
http://genos.cnpq.br:12010/dwlattes/owa/prc_imp_cv_int?f_cod=K4783623T3 |
dc.contributor.authorID.fl_str_mv |
da6a2e08-37c4-4a64-ab70-3729a9ac9dd4 |
contributor_str_mv |
Rodrigues, José de Anchieta |
dc.subject.por.fl_str_mv |
Cimento Cimentos especiais Cimentos sulfobelíticos Lama vermelha Resíduo de bauxita Sulfoaluminato de cálcio |
topic |
Cimento Cimentos especiais Cimentos sulfobelíticos Lama vermelha Resíduo de bauxita Sulfoaluminato de cálcio ENGENHARIAS::ENGENHARIA DE MATERIAIS E METALURGICA |
dc.subject.cnpq.fl_str_mv |
ENGENHARIAS::ENGENHARIA DE MATERIAIS E METALURGICA |
description |
The modern society has an elevated and increasingly pattern of consumption, demanding a high industrial productivity and generating enormous residue volumes, resulting in a conduct that is becoming each time more unsustainable. The bauxite residue (BR), also known as red mud, is the residue of biggest generation by the aluminum industry, being stocked in large impermeable deposits, being this way the passive of the highest management cost for this industrial sector. Only in Brazil the minimum estimative of BR generation is of 10.7 million tons/year. Nevertheless, the BR, although alkaline, is composed by fine particles rich in iron, aluminum and silicon oxides, consisting therefore in a raw material of possible interests for many applications in traditional ceramics, mainly in civil construction. In this alternative, the use of BR, as a raw material, in the development of new sulfobelite cements for civil construction shows itself very attractive. These cements are characterized by the calcium sulfoaluminate phase (C4A3S), higher contents of belite (β-C2S) and calcium ferrialuminate (C4AF), as well as the absence of alite (C3S). Due to this composition these cements have been showing economic-environmental, and possibly even technical, advantages over Portland cement. From their benefits, highlights a reduction of 30% to 62% on equivalent CO2 emissions, as for less limestone used, as well as, lower burning temperature, bringing also energy reduction in the process. The sulfobelite clinker was synthesized using the raw materials: limestone, commercial gypsum, BR and São Simão clay. Using expressive BR content, up to 11.2wt%; understanding the influence of Al2O3/Fe2O3 (A/F) ratio; and gypsum additions; for the synthesis of sulfobelite cements it was possible to develop satisfactory formulations. These sulfobelite cement formulations presented apparent porosity and mechanical strength equivalent to commercial Portland cement (CPII-Z32 and CPV-ARI), else than the formation of hydration products similar to a commercial calcium sulfoaluminato cement. |
publishDate |
2013 |
dc.date.available.fl_str_mv |
2013-10-17 2016-06-02T19:12:31Z |
dc.date.issued.fl_str_mv |
2013-03-18 |
dc.date.accessioned.fl_str_mv |
2016-06-02T19:12:31Z |
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info:eu-repo/semantics/publishedVersion |
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info:eu-repo/semantics/masterThesis |
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masterThesis |
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https://repositorio.ufscar.br/handle/ufscar/909 |
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https://repositorio.ufscar.br/handle/ufscar/909 |
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openAccess |
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Universidade Federal de São Carlos |
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Programa de Pós-Graduação em Ciência e Engenharia de Materiais - PPGCEM |
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UFSCar |
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BR |
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Universidade Federal de São Carlos |
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