Characteristics of the rocks of the Estrada Nova Formation as ceramic raw material in the State of São Paulo-Brazil

Reference	Presenter	Authors (Institution)	Abstract
16-011	Sergio Ricardo Christofoletti	Christofoletti, S.R.(Instituto Florestal); Roveri, C.D.(Universidade Federal de Alfenas); Rocha, R.R.(Cerâmica Rochaforte);	The ceramic results of the rocks from Estrada Nova Formation displayed that, when they are submitted to firing at 950°C, they are suitable on the production of porous floor tiles and structural ceramics. However some samples of the massive and laminated lithofacies when submitted to firing in laboratorial and industrial conditions at temperatures of 1120ºC and 1040°C, presented satisfactory results for use in the production of ceramic floor tiles via dry process or in the incorporation of the mass composition for the production of porcelain tiles. The bottom lithofacies (massive and laminated) presented more homogeneous and wider frequency curves, while the frequency curves of the upper lithofacies (intercalated and sandy) were less homogeneous and narrower. The homogeneity of the particle distribution found in the samples of the massive lithofacies favored the dry milling process, facilitating the densification stages of the final product. It was observed higher amounts of CaCO3 in the Teresina Member than in the Serra Alta Member, which caused an increase of defects and a decrease of mechanical resistance on the final products. In the laminated silty shale lithofacies samples of the Serra Alta Member, the higher values of Loss on Ignition, allied to lower amounts of CaCO3 showed a higher content of organic matter, which resulted in the swelling of the specimen tests due to the liberation of internal gas, which suggests their use as expansive clays.
<< Back