Process for working up steel slags and iron carriers for obtaining pig iron and environmentally safe slags
US6332910A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 14, 1999 |
| Grant date | Dec 25, 2001 |
| Priority date | — |
| Expiry date | May 14, 2019 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P10/20
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.