Patent Number: 6,332,910

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

Abstract: In a process for working up steel slags and iron carriers such as, e.g., electric furnace slags, converter slags, fine ores, dusts from steel production, mill scales for obtaining pig iron and environmentally safe slags, the volume ratio of molten slag to iron bath is chosen to be larger than 0.5 to 1 and, preferably, 0.8:1 to 1.5:1 and the slags are supplemented with SiO.sub.2 carriers such as, e.g., foundry sands, metallurgical sands and/or fine ores so as to adjust a slag basicity (CaO/SiO.sub.2) of between 1.0 and 1.8 and, preferably, 1.2 and 1.8 at an Al.sub.2 O.sub.3 content of between 10 and 25% by weight, based on the slag. In doing so, hot blast is top-blown and coal, optionally along with an inert gas and, in particular, nitrogen and, furthermore, optionally oxygen or hot air is blown through the iron bath.

Inventors: Edlinger; Alfred (Baden, CH)

Assignee: Holderbank Financiere Glarus AG

International Classification: C22B 7/04 (20060101); C21C 5/36 (20060101); C21C 5/28 (20060101); C21B 011/00 ()

Expiration Date: 12/25/2018