Rivas Mercury, Jose ManuelCorreia, Gricirene SousaLemos Silva Vasconcelos, Nazare Socorro [UNESP]Cabral, Aluisio AlvesAngelica, Romulo Simoes2014-05-202014-05-202012-10-01Rem-revista Escola de Minas. Ouro Preto: Escola de Minas, v. 65, n. 4, p. 513-521, 2012.0370-4467http://hdl.handle.net/11449/40966This work involved the characterization of clays collected in the municipalities of Sao Luis, Rosario, Pinheiro and Mirinzal (state of Maranho, Brazil), based on specific mass, specific surface area, cation exchange capacity (CEC), particle size distribution, X-ray diffraction (XRD), differential thermal analysis (DTA), thermogravimetric analysis (TG-DTA) and Atterberg limits. Technological tests for ceramic applications were also carried out on compacts pressed under 20 MPa and heat-treated at 850, 950, 1050, 1150 and 1250 degrees C. Our results indicated that two of the clays composed of kaolinite, quartz, and anatase with high plasticity limits, have excellent properties and can be used in the whiteware industry. The other ones are red-firing clays and have a mineralogical composition of quartz, kaolin, feldspar, montmorillonite, hematite and goethite. The latter showed low and moderate values of plasticity, which makes them suitable for the production of heavy clay products.513-521engRaw materialsMaranhaoCharacterizationArtigoS0370-44672012000400012WOS:000313533900022Acesso abertoS0370-44672012000400012.pdf