Calcium-slag additive for steel desulfurization and method for making same
US4444590A · kind A · utility
1Cited by
9References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 28, 1983 |
| Grant date | Apr 24, 1984 |
| Priority date | — |
| Expiry date | Mar 28, 2003 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC21C7/0645
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A calcium-slag additive for use in desulfurization of molten steel contains, by weight, 10-25 percent calcium metal, 30-50 percent fluorspar, 10-30 percent aluminum oxide and 10-30 percent calcium oxide. The calcium-slag is produced by forming a molten mixture of lime, fluorspar and aluminum in a graphite-lined induction furnace and heating the mixture to 1300.degree.-1600.degree. C. to form a calcium-aluminum alloy phase floating on a calcium-slag phase, and tapping the calcium-slag from the bottom of the furnace and rapidly cooling the same to form a solid calcium-slag material.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.