METHOD FOR PRODUCING LIQUID PIG IRON FROM A DRI PRODUCT

摘要

The invention relates to a method for producing liquid pig iron, comprising the following steps: i) providing a directly reduced iron product (1) (DRI product) with an iron content of at least 75.0 wt.%, a carbon content of at least 0.10 wt.% and a content of acids and basic slag components, selected from the group comprising CaO, SiO2, MgO and AI2O3, of max. 15.0 wt.%; ii) supplying the DRI product (1), adding slag formers (2), into an electrically operated smelting unit (3); iii) optionally supplying further iron and/or carbon components (5) into the electrically operated smelting unit (3); iv) smelting the DRI product (1) and optionally the further iron and/or carbon components (5) in the presence of the slag former (2), such that a liquid pig iron phase (6) and a liquid slag phase (7) are formed; v) adjusting the slag phase (7) in such a way that it has a basicity of (CaO+MgO/SiO2) from 0.95 to 1.5; vi) tapping the liquid pig iron phase (6); and vii) tapping and granulating the slag phase (7).