Method of desulfurizing a ferrous melt
US4415358A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 23, 1982 |
| Grant date | Nov 15, 1983 |
| Priority date | — |
| Expiry date | Apr 23, 2002 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB22D1/005
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A melt is contained in a vessel having below the level of the melt an at least gas-pervious wall portion. First the slag is removed, normally by pouring it off, from the melt. Then a finely divided treatment solids suspended in a gas is introduced through the wall portion into the melt. The melt reacts thoroughly with these solids. Immediately deslagging the melt substantially reduces its ability to pick up nitrogen or hydrogen. This can be enhanced by the further step, prior to introduction of the suspension, of adding pure lime to the melt to form a protective layer thereon. The vehicle gas for the powder of course is inert, normally argon. The vessel can also be sealed up with a tight cover after addition of pure lime to it and before introduction of the suspension. Otherwise in the subsequent desulfurizing nitrogen and hydrogen will enter into the metal matrix, especially if there is an appropriate slag present.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.