Análise da melhoria da eficiência de peneiramento de minérios de ferro através da implantação de isolamento térmico no sistema de secagem em altos fornos a carvão vegetal.

Abstract

This project seeks to analyze the effects caused by the installation of a thermal insulation on the drying system pipes, in a blast furnace of a steel mill localized in Juiz de Fora (MG). Treatment of iron ore’s procedures are commonly used in blast furnaces of steel mills, trying to obtain a better quality and standardization of the raw material properties. Among the techniques used, we can highlight the drying system of iron ores, which works using the blast furnaces gases, reusing them after the glendons’ exit and redirecting them to the ore’s storage chambers through pipes working with boosters. It will be discussed the changes in the ores properties, like moisture, ore’s fines percent and granulometry, from normalized trials about each one of these properties. Making detailing analyses of each, the temperature gains and the chemical composition changes will be evaluated considering an improvement on the sifting system efficiency. This improvement can bring a reduction of the raw materials consumption whose values found can be calculated using the production parameters of the furnaces studied on this project. With consumption’s reduction confirmed, we can relate this improvement with a costs reduction too and evaluate the project’s cost benefit.