Patent US2704302A successfully refreshed from Google Patents.
US4089677A
Expired / Lapsed
US
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Metal refining method and apparatus
Assignee: British Steel Corp
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Filing: 1977-05-20
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Granted: 1978-05-16
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Expires: 1997-05-20
Abstract
Abstract Various forms of method and apparatus are described for the manufacture of steel wherein solid carbonaceous materials are injected below the surface of a melt during the introduction of oxygen to raise the energy level within the melt. Solid iron-bearing materials may also be introduced to the melt and a continuous tapping process is described wherein the iron-bearing and carbonaceous materials are delivered continuously to the melt.
Inventors
- 👤 Gene D. Spenceley
- 👤 Robert Baker
- 👤 Roger A. Page
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:37
CPC Classifications
C; C21; C21C; C21C5/00; C21C5/52; C21C5/5211; C21C5/5217; C21B; C21B13/00; C21B13/0006; C21B13/0013; C21B13/0026; C21C5/28; C21C5/30; C21C5/34; C21C5/35; C21C5/56; C21C5/567; Y; Y02; Y02P; Y02P10/00; Y02P10/10; Y02P10/134; Y02P10/20
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
51 words
A method of raising the energy level of molten metal in a metallurgical vessel in the course of manufacturing steel which comprises injecting solid carbonaceous material into said molten metal below the surface thereof and introducing an oxidizing gas into the vessel to react with the carbonaceous material to liberate heat.
Claim 2
Independent Claim
51 words
A method of raising the energy level of molten metal in a metallurgical vessel in the course of manufacturing steel which comprises injecting solid carbonaceous material into said molten metal below the surface thereof and introducing an oxidizing gas into the vessel to react with the carbonaceous material to liberate heat.
Claim 3
Independent Claim
66 words
A method of raising the energy level of a molten metal in a metallurgical vessel in a steel manufacturing process which comprises the steps of: injecting solid carbonaceous material selected from the group consisting of particulate coal, coke, graphite or mixtures thereof into said molten metal below the surface thereof; and introducing an oxidizing gas into said vessel through the base or side of said vessel.
Claim 4
Independent Claim
66 words
A method of raising the energy level of a molten metal in a metallurgical vessel in a steel manufacturing process which comprises the steps of: injecting solid carbonaceous material selected from the group consisting of particulate coal, coke, graphite or mixtures thereof into said molten metal below the surface thereof; and introducing an oxidizing gas into said vessel through the base or side of said vessel.
Claim 5
Dependent Claim
19 words
A method according to claim 1 wherein the oxidizing gas is blown on to the surface of the melt.
Claim 6
Dependent Claim
28 words
A method according to claim 1 wherein the oxidizing gas is introduced into the melt through one or more tuyeres in the base or side of the vessel.
Claim 7
Dependent Claim
14 words
A method according to claim 4 wherein the vessel is an electric arc furnace.
Claim 8
Dependent Claim
26 words
A method according to claim 1 wherein the carbonaceous material comprises a material selected from the group consisting of particulate coal, coke, graphite or mixtures thereof.
Claim 9
Dependent Claim
26 words
A method according to claim 6 wherein the carbonaceous material is injected into the melt through one or more tuyeres by means of a carrier gas.
Claim 10
Dependent Claim
17 words
A method according to claim 7 wherein the carrier gas is a reducing oxidizing or inert gas.
Claim 11
Dependent Claim
22 words
A method according to claim 1 including the additional step of introducing solid iron-bearing material to the melt during the refining process.
Claim 12
Dependent Claim
26 words
A method according to claim 9 wherein the solid iron-bearing material comprises scrap, pre-reduced iron, granulated iron, iron ore, iron oxide scale or iron oxide fume.
Claim 13
Dependent Claim
24 words
A method according to claim 9 wherein the solid iron-bearing material is delivered to the upper surface of the melt during the refining process.
Claim 14
Dependent Claim
30 words
A method according to claim 9 wherein the solid iron-bearing material is preheated by the waste offtake gases from the metallurgical vessel before the material is delivered to the melt.
Claim 15
Dependent Claim
17 words
A method according to claim 12 wherein the solid iron-bearing material is preheated in a rotary kiln.
Claim 16
Dependent Claim
35 words
A method according to claim 12 wherein the solid iron-bearing material, when having a reducable element therein, is at least partially pre-reduced by the waste offtake gases before the material is delivered to the melt.
Claim 17
Dependent Claim
32 words
A method according to claim 9 wherein the solid iron-bearing material is in particulate form and is injected into the melt through one or more tuyeres by means of a carrier gas.
Claim 18
Dependent Claim
22 words
A method as claimed in claim 9 wherein the solid iron-bearing material is delivered continuously to the melt during the refining process.
Claim 19
Dependent Claim
20 words
A method according to claim 16 wherein the steel manufactured in the metallurgical vessel is tapped continuously from the vessel.
References Cited (Backward Citations)
US3556773A
Cited
US3607227A
Cited
US3567430A
Cited
US3801084A
Cited
US3876421A
Cited
US3902889A
Cited
US3953199A
Cited
US3854932A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-05-15 | 1981-11-14 | 1982-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-05-15 | 1985-11-14 | 1986-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-05-15 | 1989-11-14 | 1990-05-16 | $7700.00 | Window Closed / Lapsed |