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      Argilas bentoníticas de Cubati, Paraíba, Brasil: Caracterização física-mineralógica Translated title: Bentonite clay from Cubati, Paraíba, Brazil: Physical and mineralogical characterization

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          Abstract

          O Estado da Paraíba possui jazidas de bentonitas utilizadas comercialmente em uma vasta gama de setores tecnológicos. No entanto, esses jazimentos estão se exaurindo após dezenas de anos de exploração. Assim, este trabalho tem por objetivo a caracterização físico-mineralógica de bentonitas recentemente descobertas no município de Cubati, PB. As amostras estudadas foram secas a 60 ºC e caracterizadas por meio de fluorescência de raios X, picnometria de He, determinação da distribuição de tamanho de partículas, difração de raios X, análise térmica diferencial e gravimétrica e microscopia eletrônica de varredura. Os resultados evidenciaram que as amostras são bentonitas policatiônicas, apresentando teores de MgO, CaO e K2O semelhantes aos de outras bentonitas sul-americanas e que são constituídas por argilomineral esmectítico e por quartzo e caulinita. As amostras apresentaram frações de partículas abaixo a 2 μm variando entre 31 e 41%, estando, no entanto, em elevado estado de aglomeração.

          Translated abstract

          The bentonites of the State of Paraíba, Brazil, are commercially uses in numerous technological sectors. However, these bentonite deposits are becoming exhausted due to several years of exploitation. Thus, the aim of this work was to characterize bentonite clays recently discovered in the Cubaty town, Paraíba. The samples were dried at 60ºC and characterized through X-ray fluorescence, He picnometry, determination of the particle size distribution, X-ray diffraction, thermal differential and gravimetric analyzes and scanning electronic microscopy. The results showed that the samples are polycationic bentonite clays containing amounts of MgO, CaO and K2O similar to those of other South American bentonites and are composed of smectite, kaolinite and quartz. The samples had particle-accumulated fractions under 2 μm ranging from 31 to 41%, however, the particles were in a very agglomerated state.

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          Ciência e Tecnologia de Argilas

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            Clay Mineralogy

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              Argilas, o que são e para que servem

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                Author and article information

                Contributors
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Journal
                ce
                Cerâmica
                Cerâmica
                Associação Brasileira de Cerâmica (São Paulo )
                1678-4553
                June 2009
                : 55
                : 334
                : 163-169
                Affiliations
                [1 ] Universidade Federal de Campina Grande Brazil
                [2 ] Universidade Federal de S. Carlos
                Article
                S0366-69132009000200008
                10.1590/S0366-69132009000200008
                c4bbaa07-a8c0-4542-a3ba-876350722e9c

                http://creativecommons.org/licenses/by/4.0/

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                SciELO Brazil

                Self URI (journal page): http://www.scielo.br/scielo.php?script=sci_serial&pid=0366-6913&lng=en
                Categories
                MATERIALS SCIENCE, CERAMICS

                Ceramics
                bentonite,mineralogical characterization,clay,Paraíba,bentonita,caracterização mineralógica,argila

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