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Título: PROCESSES STUDIES TO RECOVER A TITANIUM BEARING MATERIAL FROM MAGNETITE CONCENTRATION TAILINGS
Autor: ADRIEL MARTINS DA SILVA
Instituição: PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO - PUC-RIO
Colaborador(es):  EDUARDO DE ALBUQUERQUE BROCCHI - Orientador
Nº do Conteudo: 51968
Catalogação:  24/03/2021 Idioma(s):  PORTUGUESE - BRAZIL
Tipo:  TEXT Subtipo:  THESIS
Natureza:  SCHOLARLY PUBLICATION
Nota:  Todos os dados constantes dos documentos são de inteira responsabilidade de seus autores. Os dados utilizados nas descrições dos documentos estão em conformidade com os sistemas da administração da PUC-Rio.
Referência [pt]:  https://www.maxwell.vrac.puc-rio.br/colecao.php?strSecao=resultado&nrSeq=51968@1
Referência [en]:  https://www.maxwell.vrac.puc-rio.br/colecao.php?strSecao=resultado&nrSeq=51968@2
Referência DOI:  https://doi.org/10.17771/PUCRio.acad.51968

Resumo:
Titanium pigment, which represents most of the consumption of this metal, generally has two production routes known as sulfation and chloride. Currently, TiO2 is produced mainly by chlorination due to the fact that it has advantages over the traditional sulfate process, such as cost and waste generation. This process uses concentrates of ilmenite and rutile (natural or synthetic) as the main raw materials. However, due to the low amount of rutile reserves and the cost related to Ilmenite concentration, seeking new sources of raw material becomes increasingly relevant. In this context, the present study proposed to evaluate routes of recovery of TiO2 contained in an waste of the concentration of magnetite, one of the phases of the production of vanadium oxide, through the process of roasting followed by acid leaching. According to the characterization made by X-Ray Diffraction, the waste consist of 22.2 percent of species containing titanium dioxide and the rest with other complex minerals: Clinochlor llb-2 and Tremolite. Concomitantly, the X-Ray Fluorescence analysis showed that titanium makes up 15.9 percent by mass of a sample of the tailings as received. For the study, a thermodynamic evaluation of the probable reactions between the species of waste and the selected chemical agents was carried out, as well as the effects of process variables, namely, reagent mass proportion and temperature. Roasting was carried out in a muffle furnace, with the aid of crucibles containing the sample and one of the two proposed reagents (NaOH and Na2HPO4). Then, in heated distilled water, the sample will be immersed, and soon afterwards filtered and dried to later be leached with heated 5 percent HCl, filtered and dried. The final product of the work obtained will be characterized by conventional methods: SEM; EDS; XRD and XRF. Through thermodynamic analysis, the viability to obtain an insoluble product rich in titanium was verified and the impurities were loaded in the leaching stage. The results showed an increase in mass loss during the steps and that the amount of reagent is the variable that most influences, while the temperature variation does not change drastically. At the end, the samples that reacted with NaOH, at 850 celsius degrees for 120 min with a proportion and 50 percent more by weight of the stoichiometric equivalent amount obtained a compound with 65 percent CaTiO3 and some Fe and Si impurities, obtaining a proportion of 39.2 percent of Ti in relation to the mass of the final product, representing 51.6 percent by mass of titanium recovery. For samples roasted with Sodium phosphate dibasic, they obtained products with a greater amount of impurities, the best result being also in the same conditions as Sodium hydroxide, recovering a material with 20.3 percent titanium.

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