Patent US4266969A successfully refreshed from Google Patents.
US4266969A
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US
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Desulfurization process
Assignee: Jones and Laughlin Steel Inc
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Filing: 1980-01-22
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Granted: 1981-05-12
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Expires: 2000-01-22
Abstract
Abstract A process for desulfurizing a bath of molten iron contained in a vessel comprising the steps of injecting particulate lime and a carbon-containing particulate with a non-oxidizing carrier gas beneath the surface of the bath to remove sulfur from the iron, while controlling the rate of injection of the carbon-containing particles to prevent substantial ejection of the bath from the vessel. The preferred carbon-containing materials are graphite and a compound containing at least carbon and hydrogen in proportions ranging from CH>0 to CH2. The preferred carrier gas is a hydrocarbon gas.
Inventors
- 👤 Peter J. M. Koros
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:55
CPC Classifications
C; C21; C21C; C21C1/00; C21C1/02
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
61 words
A process for desulfurizing a bath of molten iron contained in a vessel comprising the steps of: injecting particulate lime and a carbon-containing particulate with a non-oxidizing carrier gas beneath the surface of said bath to remove sulfur from said iron, while controlling the rate of injection of said carbon-containing particles to prevent substantial ejection to said bath from said vessel.
Claim 2
Dependent Claim
61 words
A process for desulfurizing a bath of molten iron contained in a vessel comprising the steps of: injecting particulate lime and a carbon-containing particulate with a non-oxidizing carrier gas beneath the surface of said bath to remove sulfur from said iron, while controlling the rate of injection of said carbon-containing particles to prevent substantial ejection to said bath from said vessel.
Claim 3
Dependent Claim
30 words
The process recited in claim 1 wherein: said carbon-containing particulate is graphite and the injection rate thereof is controlled to range up to about 20% of the lime injection rate.
Claim 4
Dependent Claim
25 words
The process recited in claim 2 wherein: said graphite injection rate is controlled to range from about 5 to 12% of the lime injection rate.
Claim 5
Dependent Claim
60 words
The process recited in claim 1 wherein: the carbon-containing particulate is a compound containing at least carbon and hydrogen in proportions ranging from CH >0 to CH 2 ; and the injection rate of said compound is controlled to release hydrogen gas in said bath at a rate not to exceed about 1% by weight of said lime injection rate.
Claim 6
Dependent Claim
34 words
The process recited in claim 4 wherein: said compound containing at least carbon and hydrogen is polypropylene; and said hydrogen release rate does not exceed about 0.7% by weight of said lime injection rate.
Claim 7
Dependent Claim
19 words
The process recited in claim 5 wherein: said polypropylene has an average grain size greater than about 75 microns.
Claim 8
Dependent Claim
21 words
The process recited in any one of claims 1, 2 or 4 wherein: the non-oxidizing carrier gas is a hydrocarbon gas.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-05-11 | 1984-11-10 | 1985-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-05-11 | 1988-11-10 | 1989-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-05-11 | 1992-11-10 | 1993-05-12 | $7700.00 | Window Closed / Lapsed |