US4217134A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Compositions and methods for desulphurizing molten ferrous metals
Assignee: Molten Steel Products Inc
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Filing: 1979-06-13
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Granted: 1980-08-12
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Expires: 1999-06-13
Abstract
Abstract Compositions comprising 50-75% w/w of lime, 20-30% w/w of fluorspar (CaF 2 ), and up to 20% w/w of ground aluminum, and methods to desulphurize molten ferrous metals, notably molten steels, by adding said compositions to molten ferrous metals in the ladle, but more preferably, by injecting the composition in particulate form into the molten body of ferrous metals, e.g., molten steels.
Inventors
- 👤 Robert E. Russell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 04:30
CPC Classifications
C; C21; C21C; C21C7/00; C21C7/04; C21C7/064; C21C7/0645
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
33 words
A composition useful in the desulphurization of molten steel consisting essentially of 50-75% of pulverized lime, 20-30% of finely divided fluorspar, and 3-20% of finely divided aluminum particles, said percentages being by weight.
Claim 2
Dependent Claim
33 words
A composition useful in the desulphurization of molten steel consisting essentially of 50-75% of pulverized lime, 20-30% of finely divided fluorspar, and 3-20% of finely divided aluminum particles, said percentages being by weight.
Claim 3
Dependent Claim
12 words
A composition as claimed in claim 1 wherein said lime is quicklime.
Claim 4
Dependent Claim
31 words
A composition as claimed in claim 2 wherein said composition consists essentially of said quicklime, said finely divided fluorspar and said finely divided aluminum particles in the stated percentages by weight.
Claim 5
Dependent Claim
34 words
A composition as claimed in claim 1 wherein said composition consists essentially of quicklime as said pulverized lime, said finely divided fluorspar and said finely divided aluminum particles in the stated percentages by weight.
Claim 6
Dependent Claim
23 words
A process for desulphurizing a molten ferrous metal, which comprises adding to said molten ferrous metal a composition as claimed in claim 1.
Claim 7
Dependent Claim
12 words
A process as claimed in claim 5 wherein said metal is steel.
Claim 8
Dependent Claim
46 words
A process of desulphurizing a molten steel, which comprises adding to said molten steel a composition as claimed in claim 1, in an amount of said composition in the range of about 8 lbs. per ton of steel to about 20 lbs. per ton of steel.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-08-12 | 1984-02-11 | 1984-08-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-08-12 | 1988-02-11 | 1988-08-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-08-12 | 1992-02-11 | 1992-08-12 | $7700.00 | Window Closed / Lapsed |