US4280836A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preheating iron scraps in steel-making by the electric arc furnace
Assignee: Kyoei Steel Ltd
•
Filing: 1980-06-02
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Granted: 1981-07-28
•
Expires: 2000-06-02
Abstract
Abstract A method of preheating iron scraps in steel-making by the electric arc furnace, by utilizing high-temperature exhaust gas to be discharged from the electric arc furnace. This method shortens, to a large extent, the time required for melting iron scraps and economizes in energy.
Inventors
- 👤 Yukimasa Maeda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 02:42
CPC Classifications
C; C21; C21C; C21C5/00; C21C5/52; C21C5/5211; C21C5/527; C21C5/56; C21C5/562; C21C5/565; F; F27; F27B; F27B3/00; F27B3/08; F27B3/085; F27D; F27D13/00; F27D13/002; F27D17/00; F27D17/20; F27D17/28; F27D17/30; F27D17/304; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
145 words
A method of preheating iron scraps in steel-making by an electric arc furnace comprising the steps of: a. burning combustible substances included in high-temperature exhaust gases generated in an electric arc furnace to render the gas non-explosive; b. directing the non-explosive high-temperature exhaust gases into a charging bucket to preheat iron scraps in the charging bucket up to a predetermined temperature; c. supplying said preheated iron scraps into the electric arc furnace; d. directing any malodorous gases generated by the evaporization of elements stuck to the iron scraps in the electric arc furnace, which gases are emitted directly from the electric furnace and charging bucket into a deodorizing apparatus; wherein the deodorization is effected by pyrolysis or burning of the malodorous elements in the exhaust gases; e. directing the deodorized gases into a dust removing machine; and f. discharging the thus-deodorized gases into the atmosphere.
Claim 2
Independent Claim
145 words
A method of preheating iron scraps in steel-making by an electric arc furnace comprising the steps of: a. burning combustible substances included in high-temperature exhaust gases generated in an electric arc furnace to render the gas non-explosive; b. directing the non-explosive high-temperature exhaust gases into a charging bucket to preheat iron scraps in the charging bucket up to a predetermined temperature; c. supplying said preheated iron scraps into the electric arc furnace; d. directing any malodorous gases generated by the evaporization of elements stuck to the iron scraps in the electric arc furnace, which gases are emitted directly from the electric furnace and charging bucket into a deodorizing apparatus; wherein the deodorization is effected by pyrolysis or burning of the malodorous elements in the exhaust gases; e. directing the deodorized gases into a dust removing machine; and f. discharging the thus-deodorized gases into the atmosphere.
Claim 3
Dependent Claim
50 words
A method according to claim 1 wherein the temperature of the exhaust gas leaving the electric furnace is over 1000° and wherein the gas is cooled down to between about 200° C. and 300° C. in the charging bucket and the deodorization is effected at temperatures higher than 500° C.
Claim 4
Dependent Claim
19 words
A method according to claim 2 wherein the deodorization is effected at temperatures between about 600° to 800° C.
References Cited (Backward Citations)
US2805930A
Cited
US3150958A
Cited
US3276859A
Cited
US3033673A
Cited
US3163520A
Cited
US3224871A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-07-27 | 1985-01-26 | 1985-07-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-07-27 | 1989-01-26 | 1989-07-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-07-27 | 1993-01-26 | 1993-07-28 | $7700.00 | Window Closed / Lapsed |