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Incorporação de lama de alto forno em cerâmica vermelha
(Incorporation of blast furnace sludge into red ceramic)
C. M. F. Vieira, C. A. C. M. Dias, A. V. Mothé, R. Sánchez, S. N. Monteiro
Laboratório de Materiais Avançados - LAMAV
Universidade Estadual do Norte Fluminense Darcy Ribeiro - UENF
Av. Alberto Lamego, 2000, Campos dos Goytacazes, RJ, 28013-602
vieira@uenf.br
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Este trabalho tem por objetivo caracterizar um resíduo siderúrgico, a lama de alto forno, e avaliar o efeito da sua incorporação até 20% em peso nas propriedades e na microestrutura de uma massa argilosa. O resíduo foi submetido a ensaios de caracterização mineralógica, química, física e morfológica. Foram preparados corpos de prova por prensagem uniaxial a 20 MPa para queima em forno de laboratório a 900 oC. As propriedades físicas e mecânicas avaliadas foram: retração linear, absorção de água e WHQVmRGHUXSWXUDjÁH[mR$PLFURHVWUXWXUDGDVFHUkPLFDVTXHLPDGDVIRLDYDOLDGDSRUPLFURVFRSLDHOHWU{QLFDGHYDUUHGXUD2V resultados mostraram que a lama de alto forno é constituída predominantemente de compostos de ferro e de material carbonoso. A granulometria deste resíduo é favorável à incorporação em cerâmica vermelha. Entretanto, o resíduo ocasionou um efeito deletério nas propriedades físicas e mecânicas da cerâmica queimada.
Palavras-chave: caracterização, cerâmica vermelha, lama de alto forno, microestrutura, propriedades, resíduo.
Abstract
This work has for objective to characterize a steel making plant waste, the blast furnace sludge, and to evaluate the effect of its
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tiles. The waste was submitted to mineralogical, chemical and physical tests. In order to determine the physical and mechanical
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MATERIAIS E MÉTODOS
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RESULTADOS E DISCUSSÃO
A Fig. 1 mostra o difratograma de raios X do resíduo. Com relação às fases cristalinas, o resíduo é constituído predominantemente de óxidos de ferro, como a hematita, a magnetita e a wustita, de calcita e de quartzo. Estes resultados estão de acordo com a literatura [7]. Deve-se ressaltar que, devido a uma composição química complexa, que será apresentada mais adiante, podem existir outras fases cristalinas minoritárias. Um outro aspecto importante
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resíduo, conforme mencionado na literatura [6]. Entretanto,
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[Figure 3: Particle size distribution curve of the waste.] &RQVWLWXLQWHV 0DWpULDVSULPDV
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[Table I - Chemical composition of the clayey body and blast furnace sludge waste (wt.%).]
C = carbono orgânico.
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[Figure 6: SEM micrograph of the fractured region of the ceramic
¿UHGDWoC without incorporated waste.]
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[Figure 7: SEM micrographs of the fractured region of the ceramic
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CONCLUSÕES
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![Figure 2: DTA/TG/DTG curves of the waste.]](https://thumb-eu.123doks.com/thumbv2/123dok_br/15302241.39695/3.892.81.432.173.408/figure-dta-tg-dtg-curves-of-the-waste.webp)
