Estudo das propriedades físicas do pó do granito corumbá em função dos parâmentros de fabricação por metalurgia do pó

Abstract

The ornamental stone industry registers a greater growth in the sector every year. As a result of this growth, a large amount of waste materials has been generated, originating from the processing of rocks, thus boosting the interest and need to minimize the environmental impacts caused and to propose the employability of these tailings. The present work aims to analyze the technological potential of the Corumbá granite tailings as a raw material for the production of sintered parts through powder metallurgy and through tests and analysis of physical properties. Granite dust characterization analyzes were performed using X-ray diffraction, X-ray fluorescence and real loose grain density. In order to analyze the influence of the compaction load on the sintering temperature, as they were compacted at four different loads a) 20 kN, b) 40 kN, c) 60 kN and d) 80 kN and sintered at two temperatures A - 1140°C and B - 1170°C. Subsequently, linear shrinkage, water absorption, apparent specific density of the sintered parts and porosity analyzes were performed for the two sets. The results obtained allowed to obtain that at a temperature of 1140 °C the sintering of 1140 °C, the previous sintering was insufficient, as the gresification curve showed that the adaptation with the increase in linear shrinkage, that is, to reduce the porosity, a greater compression load and higher power consumption. Sintering at 1170 °C was considered satisfactory, as the results obtained in the gresification curve showed high shrinkage and low water absorption. The results of porosity allowed us to conclude that there was no statistically decreased variation, as the amplitude of the results of standard deviations intersects, which forced that the PC reached a compaction saturation and that the porosity is independent of the compaction pressure, which is excluded exclusively at sintering temperature.