Process for working up steel slags and iron carriers for obtaining pig iron and environmentally safe slags

A process for working up steel slags and iron carriers comprising at least one member selected from the group consisting of electric furnace slags, converter slags, fine ores, dusts from steel production, mill scales for obtaining pig iron and environmentally safe slags, comprising

• forming a slag and iron bath suspension by thorough mixing of molten slag with an iron bath,
• wherein the volume ratio of molten slag to iron bath is chosen to be larger than 0.5 to 1,
• adding to the slag and iron bath suspension SiO2 carriers comprising at least one member selected from the group consisting of foundry sands, metallurgical sands and fine ores so as to adjust a slag basicity of between 1.0 and 1.8 at an Al2O3 content of between 10 and 25% by weight, based on the slag,
• top-blowing hot blast,
• blowing through the iron bath coal, optionally along with an inert gas, and, optionally oxygen or hot air is also blown through the iron bath, and
• wherein the process is carried out in a converter with submerged tuyeres.