Ceramic raw materials from the State of Maranhão, Brazil. Part 1: chemical and mineralogical characterization and technological properties of clays from São Luis, Rosário, Pinheiro and Mirinzal

Rem: Revista Escola de Minas

José Manuel Rivas Mercury²  Gricirene Sousa Correia¹  Nazaré Socorro Lemos Silva Vasconcelos¹  Aluísio Alves Cabral Jr.¹  Rômulo Simões Angélica¹ 

[1] ,Instituto Federal do Maranhão Departamento de Química Programa de Pós-Graduação em Engenharia dos Materiais

关键词: Raw materials;    Maranhão;    Characterization;    Matérias-primas cerâmicas;    Maranhão;    caracterização;   

DOI  :  10.1590/S0370-44672012000400012

来源: SciELO

【 摘 要 】

This work involved the characterization of clays collected in the municipalities of São Luis, Rosário, Pinheiro and Mirinzal (state of Maranhão, 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 1250ºC. 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.

【 授权许可】

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