Estudo das propriedades físicas do pó do Granito Verde Ubatuba em função dos parâmetros de processamento de pós cerâmicos

Abstract

The dimension stone sector presents exponential growth every year. On the other hand, this activity has generated large amounts of waste from the processing stages of these materials, thus motivating the need to minimize the environmental impacts caused and propose a better destination for these wastes. Therefore, the present work aims to analyze the potential of the Verde Ubatuba granite tailings as a raw material for the production of sintered parts through the powder through the investigation of its physical properties. The residue was characterized through the real density of the loose grain. To analyze the influence of the compaction load on the sintering temperature, the pieces were compacted at four different loads a) 20 kN, b) 40 kN, c) 60 kN and d) 80 kN, and sintered at three temperatures A – 1130° C, B - 1140°C and C - 1150°C. Then, analyzes of linear shrinkage, water absorption, apparent specific density of the sintered parts and porosity were carried out for the three sets. The tests allowed to visualize results to conclude that in the temperature of 1130 °C and 1140 °C it presented insufficiency in its saturation, since the gresification curve showed that the water absorption decreases with the increase of the linear shrinkage, that is, to be a reduction of the porosity, a higher compaction load is required, thus having a higher energy consumption. At the temperature of 1150 °C, the results obtained in the gresification curve showed a high linear shrinkage and low water absorption, making the curve satisfactory. Analyzing the porosity, the results showed that there was no statistically significant variation, since the amplitude of the standard deviations intersects, which shows that the specimens reached a saturation of compaction and that the porosity does not depend on the compaction load, being dependent only the sintering temperature.