Caracterização de novos depósitos de argilas do Estado da Paraíba visando seu uso como matérias-primas cerâmicas.

Abstract

In recent years, new clays deposits have been discovered in the state of Paraiba, the characterization of these deposits is of fundamental importance to establish the best industrial usage. In this context, the aim of this study was characterized clays in the municipality of Cubati-PB, to establish their appropriate uses as ceramic raw materials. Therefore, the raw materials were subjected to the following characterization techniques: physical, chemical, mineralogical and thermal. Later, specimens were prepared by uniaxial pressing at 19 MPa, before dry at 110°C, and submitted to firing at temperatures of 750°C, 850°C, 950°C and 1150°C. It were determined the physical and mechanical properties: linear firing shrinkage (LFS), water absorption (WA), apparent density (DAp), apparent porosity (PA) and flexural modulus of rupture (MRF). The clays A, B and C are suitable for use in white ceramic and D to red ceramic. And all the clays contain adequate mineralogical composition for use in red ceramic.