Estudo do comportamento reológico de suspensões argilosas da Formação Corumbataí
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Data
2007-06-29
Autores
Rocha, Rogers Raphael da [UNESP]
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Editor
Universidade Estadual Paulista (Unesp)
Resumo
O estudo do comportamento reológico de barbotinas com argilas da Formação Corumbataí, surgiu da necessidade das indústrias cerâmicas do Pólo de Santa Gertrudes se adaptarem às mudanças do comportamento mercadológico e ao aumento das exigências dos órgãos ambientais em relação aos riscos causados pela geração de poeira pelo processo de moagem via seca. Foram selecionadas três áreas geograficamente distantes, mas dentro do pólo, e foram feitas caracterizações mineralógicas e reológicas. Para o estudo reológico foram feitas medidas de viscosidade, tensão de cisalhamento e taxa de cisalhamento com viscosímetro rotacional, tendo como parâmetros de controle, o teor de sólidos da barbotina e a granulometria. Desta forma, foram obtidas curvas de defloculação e foram medidas variações nas suspensões, tais como o comportamento pseudoplástico e a tixotropia. Também foi analisada a dependência do comportamento reológico com a mineralogia das argilas, obtida por difração de raios X. Os resultados das curvas de fluxo e de viscosidade mostraram-se muito coerentes com a mineralogia determinada, indicando uma piora do comportamento reológico no sentido da base para o topo da Formação, bem como lateralmente, na dependência de alteração supérgena, permitindo avaliar o uso destas argilas no processo de preparação de massa via úmida.
The study of rheological behavior of clay slips at Corumbataí Formation, arose from the need for the ceramic industries of Santa Gertrudes Pole to adapt to the changes of the market behavior and the demands of the environmental organs regarding the risks caused by the generation of dust, by the dry milling mass preparation. Three geographically distant regions were selected inside the area of the pole, mineralogical and rheological characterization were made. Viscosity measurements, shear stress and shear rate have been made with rotational viscometer, by having the solid content of the slip and particle size as control parameters. Therefore defloculation curves were made and variations of the suspensions have been verified, like the pseudoplastic behavior and the tixotropy. The dependence of the rheological behavior on the clay mineralogy has also been analyzed and it was obtained by X-ray diffraction. The results of the rheological curves appeared to be very coherent with the determined mineralogy, indicating a worsening of the rheological behavior from the bottom to the top of the formation, as well as laterally, in dependence on the superficial alteration, permitting to evaluate the use of these clays in the wet milling process.
The study of rheological behavior of clay slips at Corumbataí Formation, arose from the need for the ceramic industries of Santa Gertrudes Pole to adapt to the changes of the market behavior and the demands of the environmental organs regarding the risks caused by the generation of dust, by the dry milling mass preparation. Three geographically distant regions were selected inside the area of the pole, mineralogical and rheological characterization were made. Viscosity measurements, shear stress and shear rate have been made with rotational viscometer, by having the solid content of the slip and particle size as control parameters. Therefore defloculation curves were made and variations of the suspensions have been verified, like the pseudoplastic behavior and the tixotropy. The dependence of the rheological behavior on the clay mineralogy has also been analyzed and it was obtained by X-ray diffraction. The results of the rheological curves appeared to be very coherent with the determined mineralogy, indicating a worsening of the rheological behavior from the bottom to the top of the formation, as well as laterally, in dependence on the superficial alteration, permitting to evaluate the use of these clays in the wet milling process.
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Ciência dos materiais, Reologia, Ceramic raw materials, Corumbataí formation, Rheology
Como citar
ROCHA, Rogers Raphael da. Estudo do comportamento reológico de suspensões argilosas da Formação Corumbataí. 2007. 172 f. Dissertação (mestrado) - Universidade Estadual Paulista, Instituto de Geociências e Ciências Exatas, 2007.