integrated process for the production of metallic iron from the recycling of steel waste for use in steel metallurgy

摘要

Integrated process for the production of metallic iron from the recycling of steel waste for use in steel metallurgy This patent application refers to the integrated process for the production of metallic iron from the recycling of steel waste for use in steel metallurgy steel, such a process recycles waste generated in iron and steel manufacturing and steel mill rolling lines. This recycling process uses the powders that are retained in the electrostatic precipitator of the sintering process, blast furnace sludge, already separated into the carbon and iron fractions, flask dust, steel sludge, fine scale and synthetic iron oxide generated in the sintering process. acid pickling. The recycling process, which aims to produce metallic iron, which is obtained through the manufacture of self-reducing pellets with an iron content higher than 60% obtained by mixing the powders, sludge, fine scale and iron oxide. of acid pickling, passing after this mixture through a drying and heating process. Obtaining metallic iron through melting / immediate reduction from the addition of the self-reducing pellets in the torpedo car and / or cast iron transport pan in use due to the high iron recovery speed of the self-reducing pellets when subjected. at high temperatures with incorporation yield of the iron generated in the bath in the order of 100%.