Estudo em laboratório de misturas para o desenvolvimento do sínter metalúrgico

Abstract

The sínter, together with the steel coke, is the main input for the production of pig iron in the blast furnace, so develop methodologies that evaluate how the raw materials that constitute it interact through each other, by evaluating the phases that were formed. During the síntering process, it is relevant for the elaboration of good practices that favor the improvement of metallurgical sínter quality during the sínter production process in the síntering plants of the steel mills, thus obtaining a product that better meets the blast furnace demand. promoting the reduction of possible operating costs of this equipment. The formation of the metallurgical sínter phases is directly related to the oxides present in its chemical composition. The main oxides present in the metallurgical sínter are Al2O3, SiO2, MgO, CaO and Fe2O3. Through the interaction of these oxides in the síntering process, the phases present in the metallurgical sínter will originate. In addition to the chemical composition of the mixture to be síntered, síntering conditions also influence the formation of the phases present in the final product. Factors such as síntering temperature and cooling rate influence the formation of the phases found in the sínter. The síntering temperature besides influencing the phase formation also influences the microstructure formation that will be formed in the metallurgical sínter. Another relevant point of this work is that blast furnace slag (Sand 2) was used as an alternative for reusing this byproduct in the sínter production process. In this work, the X-ray diffraction technique with Rietveld refinement of the diffractograms generated was used to identify the phases present in the síntered pellets and also to identify the fractions of each phase after the síntering process.