Estudo sobre a gênese dos depósitos de palygorskita na região de Guadalupe (PI), Bacia do Parnaíba

• Autor(a) principal: Pôssa, Jéssica Tiné
• Data de Publicação: 2021
• Outros Autores: [e-mail]
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Biblioteca Digital de Teses e Dissertações da UERJ
• Texto Completo: http://www.bdtd.uerj.br/handle/1/19755
• topic: Atapulgita/palygorskita;; Argila Industrial;; Argilominerais;; Mineralogia;; Formação Poti;; Formação Piauí;; Formação Pedra de Fogo.; CIENCIAS EXATAS E DA TERRA::GEOCIENCIAS::GEOLOGIA

Palygorskite is a clay mineral with structural units forming ribbons, the economic importance of this mineral is directly related to its unusual structure and physicochemical properties that give it a wide variety of uses in industry. The formation stability field of palygorskite is very limited, which makes deposits of this clay rare around the world, in Brazil the only exploitable deposits of this mineral are located in the city of Guadalupe, Piauí state, and are inserted in the geological context of Parnaíba Basin, specifically in the Carboniferous and Permian sequence represented by the Piauí, Poti and Pedra de Fogo Formations. The objective of this work was made a geological and mineralogical description of palygorskite deposits and occurrences in the Guadalupe-PI region in order to correlate the results found with the geological context of the region and palygorskite formation hypotheses. 6 field points were investigated, among them mines in activity, mines abandoned and points of occurrence, and 25 samples were collected. The working samples were the raw samples and they went through a beneficiation process to concentrate particles with particle size smaller than 44 µm. XRD, SEM/EDS, density and particle size analysis were performed. Most of the samples are constituted by palygorskite, quartz and kaolinite, however specific samples show changes in mineralogical composition such as: presence of dolomite and absence of kaolinite or palygorskite. Density and particle size analyzes were used aiming at the industrial applicability of these samples, the density results of 28 samples gave values from 2.38 to 2.71 g/cm3, and in the particle size analysis the minimum processing yield was 60.44 % and maximum 97% of material with particle size below 44 µm with the presence of a maximum of 7.17% of magnetic material.