Influência da sílica e da temperatura nas propriedades físicas dos agregados sintéticos produzidos com resíduo do processo bayer

Abstract

The use of waste from the mining and metallurgy industry has become indispensable, so that this industrial segment is inserted in the concept of sustainable development. The work shows an application for red mud that, in combination with other materials such as silica and clay, produces a material with mechanical resistance and specific mass, which can be compared to the natural aggregates used by the civil construction industry. In the work all the raw materials and the final sintered product were submitted to x-ray diffraction analysis, scanning electron microscopy. Red mud and clay were also analyzed by x-ray fluorescence. The synthetic aggregates were produced with the intention of studying the relationship between the amount of silica used and the apparent specific mass, which had satisfactory results on sintered specimens at 1300 ° C, obtaining heavy aggregates with 10% silica and aggregates with values below 2 g/cm3 with 20% and 30% silica samples, characterizing so the aggregate as light. Therefore, the silica content, the amount of clay used together with the oxides present in the red mud, together with the ideal granulometry of these materials and the temperature, form a glassy phase that will give the aggregates important characteristics such as porosity, mechanical strength and apparent specific mass.