ULISSES SOARES DO PRADO
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Resumo IPEN-doc 25499 Effects of red mud on properties of red ceramics2018 - BABISK, M.P.; AMARAL, L.F.; RIBEIRO, L.S.; PRADO, U.S.; MONTEIRO, S.N.; VIEIRA, C.M.F.Alumina is obtained through the chemical processing of bauxite, known as Bayer process. During this process an insoluble residue denominated red mud is generated. In addition to silica, red mud has high levels of iron, sodium, calcium and other elements that can add important characteristics to ceramic products. In this sense, this work had the objective of evaluating the effect of utilization of red mud as raw material to traditional ceramic production. As raw materials, besides the red mud, two clays suitable for ceramic products manufacturing were used. The raw materials were submitted to physical, chemical, mineralogical and morphological characterization. The specimens were prepared by uniaxial pressing and sintered in temperatures at 850, 950 and 1050 °C. The relative dry density, firing linear shrinkage, water absorption and mechanical resistance were evaluated. It was demonstrated the real potential that this ceramic segment has in attempt to provide a technical and environmentally correct solution for utilization of red mud as raw material.Resumo IPEN-doc 25493 Soda lime silica glasses obtained from industrial solid wastes2018 - ARAUJO, M.S.; PRADO, U.S.; GENOVA, L.A.In this work, soda-lime glasses were produced using industrial solid wastes such as rice husk ash (RHA) and spent catalyst at the Petrochemical Fluid Catalytic Cracking units (ECAT) as alternative raw materials for silica (SiO2) and alumina (Al2O3). These correspond to two particularly valuable solid wastes, which are not well explored in the viewpoint of glass production. For the fabrication of vitreous samples we have also used, besides the wastes, commercial sodium carbonate and lime. Soda-lime glass containing the wastes was prepared by melting in alumina crucibles at 1600°C for 1 hour. Annealing treatments were performed for 3 hours at 530°C and then cooled to room temperature inside the furnace. The glass samples were characterized using XRF, XRD, ATG and visible spectrometer. The color measurement by (CIE) chromaticity diagram and optical transmission showed a good optical transparency of the glass samples, which confirmed the total vitrification. The results demonstrate that both can be used in their raw form (without treatment) replacing important raw materials, sources of Al2O3 and SiO2, essential for glass formation. The samples obtained presented amber color due to the presence of nickel (Ni²+ ion) from ECAT. Thus, the obtained glass is suitable for applications requiring low light transmittance such as colored glasses containers in general, which does not require complete visibility and transparency.Resumo IPEN-doc 22164 Use of rice rusk ash and spent catalyst as a source of raw material for the production and characterization of soda-lime silicate glasses destined for packaging2015 - ARAUJO, MARIANA S.; GENOVA, LUIS A.; PRADO, ULISSES S. do