US4330108A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for cooling tuyeres
Assignee: JFE Steel Corp
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Filing: 1981-02-24
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Granted: 1982-05-18
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Expires: 2001-02-24
Abstract
Abstract In a method for cooling tuyeres when molten iron is refined by blowing a refining gas containing oxygen, and by setting tuyeres below or above the meniscus of iron bath in a vessel for refining the molten iron, wherein concentric tuyeres are used and a refining gas containing oxygen gas is blown through the inner pipe of the concentric tuyere and a fluid for protecting the tuyeres is blown through the outer pipe of the tuyere so that the protecting fluid surrounds the refining gas in a sheath form to cool the top ends of the tuyeres, the protecting fluid being a mixture of gaseous or liquid carbon dioxide and carbon fine particles.
Inventors
- 👤 Kyoji Nakanishi
- 👤 Kenji Saito
- 👤 Yoshiei Kato
- 👤 Tsutomu Nozaki
- 👤 Toshihiko Emi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 18:32
CPC Classifications
C; C21; C21C; C21C5/00; C21C5/28; C21C5/30; C21C5/34; C21C5/42; C21C5/46; C21C5/48
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
150 words
In a method for cooling tuyeres when molten iron is refined by blowing a refining gas containing oxygen by setting tuyeres below or above the meniscus of iron bath in a vessel for refining the molten iron, wherein concentric tuyeres are used and a refining gas containing oxygen gas is blown through an inner pipe of the concentric tuyere and a fluid for protecting the tuyeres is blown through the outer pipe of the tuyere so that the protecting fluid surrounds the refining gas in a sheath form to cool top ends of the tuyeres and prevent the wear of the tuyeres, the improvement comprising using a mixture of at least one member of the group consisting of carbon dioxide gas, carbon dioxide liquid and a mixture of carbon dioxide gas and liquid, and carbon fine particles as the protecting fluid, molar ratio of carbon to carbon dioxide being 0.5-1.0.
Claim 2
Dependent Claim
150 words
In a method for cooling tuyeres when molten iron is refined by blowing a refining gas containing oxygen by setting tuyeres below or above the meniscus of iron bath in a vessel for refining the molten iron, wherein concentric tuyeres are used and a refining gas containing oxygen gas is blown through an inner pipe of the concentric tuyere and a fluid for protecting the tuyeres is blown through the outer pipe of the tuyere so that the protecting fluid surrounds the refining gas in a sheath form to cool top ends of the tuyeres and prevent the wear of the tuyeres, the improvement comprising using a mixture of at least one member of the group consisting of carbon dioxide gas, carbon dioxide liquid and a mixture of carbon dioxide gas and liquid, and carbon fine particles as the protecting fluid, molar ratio of carbon to carbon dioxide being 0.5-1.0.
References Cited (Backward Citations)
US3330645A
Cited
US4089677A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-05-17 | 1985-11-16 | 1986-05-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-05-17 | 1989-11-16 | 1990-05-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-05-17 | 1993-11-16 | 1994-05-18 | $7700.00 | Window Closed / Lapsed |