US3862834A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for producing steel
Assignee: Fried Krupp AG
•
Filing: 1972-08-01
•
Granted: 1975-01-28
•
Expires: 1992-08-01
Abstract
Abstract A method for reducing iron ore dust, including forming the dust into a cloud, transporting the cloud in reducing gas, reacting the cloud with the gas for enriching the dust, and introducing the transported cloud into the plasma stream of a plasma burner whose plasma stream is penetrating into the bath of a melting furnace.
Inventors
- 👤 Waclawiczek Herbert Ritter Von
- 👤 Klaus Ermisch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 05:11
CPC Classifications
C; C21; C21B; C21B13/00; C21B13/12; C21B13/125; Y; Y02; Y02P; Y02P10/00; Y02P10/10; Y02P10/134
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
102 words
A METHOD FOR REDUCING IRON ORE DUST, COMPRISING A. A FORMING SAID DUST INTO A CLOUD; B. TRANSPORTING SAID CLOUD IN REDUCING GAS TO A PLASMA STREAM OF A PLASMA BURNER; C. REACTING SAID CLOUD WITH SAID REDUCING GAS DURING TRANSPORTING TO ENRICH SAID DUST AND REDUCE SAID ORE; D. INTRODUCIG THE TRANSPORTED CLOUD CONTAINING REDUCED ORE INTO THE PLASMA STREAM OF A PLASMA BURNER TO MELT THE REDUCED ORE FORM LIQUID PARTICLES; AND E. DIRECTING THE PLASMA STREAM TO PENETRATE INTO A LIQUID METAL BATH OF A MELTING FURNACE TO PASS SAID LIQUID PARTICLES INTO AND MIX THE LIQUID METAL BATH.
Claim 2
Independent Claim
102 words
A METHOD FOR REDUCING IRON ORE DUST, COMPRISING A. A FORMING SAID DUST INTO A CLOUD; B. TRANSPORTING SAID CLOUD IN REDUCING GAS TO A PLASMA STREAM OF A PLASMA BURNER; C. REACTING SAID CLOUD WITH SAID REDUCING GAS DURING TRANSPORTING TO ENRICH SAID DUST AND REDUCE SAID ORE; D. INTRODUCIG THE TRANSPORTED CLOUD CONTAINING REDUCED ORE INTO THE PLASMA STREAM OF A PLASMA BURNER TO MELT THE REDUCED ORE FORM LIQUID PARTICLES; AND E. DIRECTING THE PLASMA STREAM TO PENETRATE INTO A LIQUID METAL BATH OF A MELTING FURNACE TO PASS SAID LIQUID PARTICLES INTO AND MIX THE LIQUID METAL BATH.
Claim 3
Dependent Claim
23 words
A method as claimed in claim 1, further comprising continuously draining metal from said bath and subjecting the drained metal to further refining.
Claim 4
Dependent Claim
38 words
A method as claimed in claim 1, further comprising producing said reducing gas by transferring heat from a nuclear reactor to a cracking tube containing a material selected from the group consisting of coal, oil, and natural gas.
Claim 5
Dependent Claim
34 words
A method as claimed in claim 1, further comprising producing said reducing gas by transferring heat used for carrying out the step of reacting into a cracking tube containing natural gas and exhaust gas.
Claim 6
Dependent Claim
28 words
A method as claimed in claim 1, wherein the step of reacting is carried out by heating said gas and dust with heat transferred from hot exhaust gas.
Claim 7
Dependent Claim
28 words
A method as claimed in claim 1, further comprising continuously feeding to said bath a liquid slag-building means and continuously removing slag from the top of said bath.
Claim 8
Dependent Claim
14 words
A method as claimed in claim 6, wherein said slag-building means is calcium carbide.
Claim 9
Dependent Claim
26 words
A method as claimed in claim 1, wherein said reducing gas is directed at said dust for effecting the forming of the dust into a cloud.
Claim 10
Dependent Claim
20 words
A method as claimed in claim 1, wherein said iron ore dust initially contains at least 63% by weight iron.
References Cited (Backward Citations)
US3347766A
Cited
US3290723A
Cited
US3342250A
Cited
US3475158A
Cited
US3429691A
Cited
US3615349A
Cited
US3547622A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-01-27 | 1978-07-29 | 1979-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-27 | 1982-07-29 | 1983-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-27 | 1986-07-29 | 1987-01-28 | $7700.00 | Window Closed / Lapsed |