Melhoria da qualidade da sucata utilizada em forno elétrico a arco através da combinação de duas rotas de processamento

Abstract

The mobile shear is one of the equipments of the scrap yard which process bundles made by domestic scrap, making it suitable for the process. There are scrap processing equipment that has a cleaning system which remove a part of the impurities aggregated in the scrap, such as the Shear Press, for example. However, the mobile shear does not have a cleaning system, then the major amount of impurity remains incorporated to scrap, which limits its use in EAF, because the impurity reduces the metallic yield and increase the specific energy consumption of the EAF. The shear press is also an equipment capable to process the bundles, but due to size of the bundles, the process capacity of the shear press to this specific kind of scrap is limited. The purpose of this research is got a quantitative reference of impurities removed from this scrap by the combination of two forms of processing, mobile shear and shear press. It was observed that the heats which was using the test scrap had lower charging weight with a higher tapping weight compared to the base heats. The variables metallic yield and specific energy were the main affect in the preliminary test heats using the methodology. The results were acceptable to be able to proceed for more test heats to explore the full potential of the added step at the scrap processing. The processing results showed that 9.1% of impurities were REMOVED by the mobile shear, and 5.12% by the shear press, using the proposed processing rout.