Caracterização química e mineralógica das argilas utilizadas na produção de cerâmica vermelha no estado de Sergipe

• Ano de defesa: 2011
• Autor(a) principal: Prado, Carolina Mangieri de Oliveira
• Orientador(a): Alves, José do Patrocínio Hora
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Sergipe
• Programa de Pós-Graduação: Pós-Graduação em Química
• País: BR
• Palavras-chave em Português: Argila; Cerâmica vermelha; Sergipe
• Palavras-chave em Inglês: Clay; Red ceramic; Sergipe
• Área do conhecimento CNPq: CNPQ::CIENCIAS EXATAS E DA TERRA::QUIMICA
• Link de acesso: https://ri.ufs.br/handle/riufs/6126

This work is part of the "Technological characterization of clays used in the production of red ceramics in Sergipe State", passed the Proclamation 25/2008 MCT / CT - Mineral / CNPq and aims at the chemical and mineralogical characterization of clayey raw-materials of the state to subsidize the activities of the Local Productive Arrangement (LPA) of Red Ceramic. Nowadays, there are in the state about 92 micro and small ceramics factories that extract a large number of clay from natural deposits, having only empirical knowledge of these deposits; neither chemical composition nor mineralogical composition of these clays are known. Furthermore, the masses compositions are also made empirically, based on experience from a technical or practical (mostly), making it difficult to standardize the formulations and leading to production of products without a hard limit of the specification. Thus, the information generated in this work can support the LPA of Red Ceramic in the manufacturing of products with better technological quality. We collected 22 samples corresponding to 14 clay deposits and distributed in 8 counties of the state. For minerals identification, it was used the technique of X-ray diffraction and for chemical constituents determination, it was used Xray fluorescence by dispersive energy. Particle size and limit plasticity were determined for physical characterization. The mineralogical constituents that predominated in the samples were kaolinite, halloysite, also presenting the mineral clay montmorillonite and some impurities such as quartz. Regarding the granulometry, the samples had higher percentages of silt (45,1%-85,4%) and plasticity limit between 19,9 to 31,3%. The principal component analysis (PCA) applied to the chemical composition of the samples allowed to group the clay deposits with characteristics of flux source, quartz source and high concentrations of iron oxides. These informations are relevant to the selection of clays, which will be used in the formulation of the masses that will be used in the manufacturing of red ceramic.