Process and an arrangement for the production of steel from sponge iron

Abstract

A process and an arrangement for the production of steel from sponge iron. In order to be able to process sponge iron with high contents of acid gangue and a phosphorus content of more than 3% in an economic and operationally safe manner, the following measures are taken: melting the sponge iron charge, if desired, together with scrap, in an acid-lined electric furnace, tapping the steel melt slag-free into a basic-lined ladle by introducing a particulate dephosphorizing agent into the casting jet, removing the phosphorus-containing slag formed from the ladle and subsequently introducing the ladle into a ladle heating stand, in which additional dephosphorizing agent is blown into the melt together with oxygen or oxygen-containing gas, which treatment, if necessary, is repeated after extraction of the formed slag, with the ladle content optionally being heated to adjust the desired dephosphorization temperature of about 1,550.degree. to 1,600.degree. C., and, after desphosphorization has been completed, adjusting the desired steel composition by adding alloying components, such as ferromanganese, killing agents, such as silicon and aluminum, as well as, if necessary, desulphurating agents, such as calcium.

Dependencies are inferred from the claim text.