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On-line version ISSN 1678-4553
MENEZES, R. R. et al. Bentonite clay from Cubati, Paraíba, Brazil: Physical and mineralogical characterization. Cerâmica [online]. 2009, vol.55, n.334, pp. 163-169. ISSN 1678-4553. http://dx.doi.org/10.1590/S0366-69132009000200008.
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.
Keywords : bentonite; mineralogical characterization; clay; Paraíba.