Minimize sinter degradation and segregation
Duration: 07/2019 – 06/2023
To ensure a sufficient gas distribution in the blast furnace, fine-grained input materials must be agglomerated by sintering.
Between sinter plant and blast furnace the sinter passes through various conveying systems, coolers, sieves, and bunkers. Due to mechanical stress the sinter degrades partly. Before charging the blast furnace the resulting fines <5mm are screened out and are fed to the sinter plant again.
As iron ore sintering is a highly energy consuming process, these return fines cause high costs and emissions. Additionally, segregation effects during transport and storing lead to fluctuations in the particle size distribution, thus to fluctuations of the gas distribution in the blast furnace.
The aim of this project is to reduce costs and emissions by minimizing return fines and segregation. MinSiDeg received funding by the EU and is executed by 6 partners in Austria and Germany.
At first the breakage behavior of sinter, especially the particle size distribution after damaging events is an important aspect for discrete element simulations. Because of great heterogeneity and big differences in particle shapes, a high number of tests was necessary.
Based on test results, a new breakage model was developed to predict bulk material degradation with discrete element simulations. This will be used to optimize critical sections in existing sinter transportation and storage plants. Furthermore, innovative transportation, transfer and storage systems will be tested to save return fines and stabilize particle size distribution.