US3920448A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process and converter for refining liquid metals
Assignee: Eisenwerke Gesellschaf Maximilianshuette mbH
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Filing: 1973-10-02
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Granted: 1975-11-18
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Expires: 1993-10-02
Abstract
Abstract An improvement in the refining of molten metals in a convertor by means of oxygen introduced into the metal through tuyeres which include two concentric pipes, oxygen being passed into the melt through the central pipe and a protective fluid being passed into the melt as a sheath or screen around the oxygen, through the clearance space between the two pipes. In the present invention two or more tuyeres, disposed horizontally and each passing through the convertor sidewall permit refining to be accomplished without any slopping or splashing of the melt and with only minor wear of the convertor lining.
Inventors
- 👤 Helmut Knuppel
- 👤 Karl Brotzmann
- 👤 Hans Georg Fassbinder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:45
CPC Classifications
C; C21; C21C; C21C5/00; C21C5/28; C21C5/30; C21C5/34
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
147 words
IN A PROCESS FOR REFINING METAL IN A REFRACTORY, MASIONARY LINED REFINING VESSEL WITH A NEARLY CIRCULAR HORIZONTAL CROSS SECTION WHEREIN A STREAM OF OXYGEN GAS SURROUNDED BY A SEPARATE STREAM OF FLUID HYDROCARBONS IS INTRODUCED INTO THE MOLTEN METAL UNDERNEATH THE BATH SURFACE, THROUGH AT LEAST ONE TUYERE WHICH INCLUDES AN INNER PIPE FOR THE OXYGEN AND AN OUTER PIPE WHICH INCLUDES AN INNER PIPE FOR THE OXYGEN AND AN SAID PIPES BEING FOR THE INTRODUCTION OF SAID FLUID HYDROCARBONS, THE IMPROVEMENT WHICH COMPRISES: INTRODUCING THE OXYGEN AND HYDROCARBONS THROUGH AT LEAST ONE PAIR OF OPPOSED TUYERES IN ORDER TO ACHIEVE THE DESIRED CONTROL OF BATH MOTION, SAID TUYERES BEING LOCATED IN THE LATERAL SIDE WALL OF SAID REFINING VESSEL AND BEING ARRANGED SO THAT THE ANGLE BETWEEN EACH TUYERE AND A DIAMETER CONNECTING THE DISCHARGE ENDS OF EACH PAIR OF TUYERES DOES NOT EXCEED 20*.
Claim 2
Dependent Claim
147 words
IN A PROCESS FOR REFINING METAL IN A REFRACTORY, MASIONARY LINED REFINING VESSEL WITH A NEARLY CIRCULAR HORIZONTAL CROSS SECTION WHEREIN A STREAM OF OXYGEN GAS SURROUNDED BY A SEPARATE STREAM OF FLUID HYDROCARBONS IS INTRODUCED INTO THE MOLTEN METAL UNDERNEATH THE BATH SURFACE, THROUGH AT LEAST ONE TUYERE WHICH INCLUDES AN INNER PIPE FOR THE OXYGEN AND AN OUTER PIPE WHICH INCLUDES AN INNER PIPE FOR THE OXYGEN AND AN SAID PIPES BEING FOR THE INTRODUCTION OF SAID FLUID HYDROCARBONS, THE IMPROVEMENT WHICH COMPRISES: INTRODUCING THE OXYGEN AND HYDROCARBONS THROUGH AT LEAST ONE PAIR OF OPPOSED TUYERES IN ORDER TO ACHIEVE THE DESIRED CONTROL OF BATH MOTION, SAID TUYERES BEING LOCATED IN THE LATERAL SIDE WALL OF SAID REFINING VESSEL AND BEING ARRANGED SO THAT THE ANGLE BETWEEN EACH TUYERE AND A DIAMETER CONNECTING THE DISCHARGE ENDS OF EACH PAIR OF TUYERES DOES NOT EXCEED 20*.
Claim 3
Dependent Claim
14 words
The process of claim 1 wherein the metal to be refined is pig iron.
Claim 4
Dependent Claim
28 words
The process of claim 1 wherein there is only one single pair of refining tuyeres and they are disposed horizontally when the convertor is in its refining position.
Claim 5
Dependent Claim
18 words
The process of claim 1 wherein a pair of tuyeres is mounted below the trunnions of said convertor.
Claim 6
Dependent Claim
26 words
The process of claim 1 wherein each pair consists of several tuyeres arrayed in groups locateD in the convertor in the wall region below the trunnions.
Claim 7
Dependent Claim
24 words
The process of claim 1 wherein said tuyeres in the refining vessel are mounted approximately 20-60 cm above the bottom level of the vessel.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-11-17 | 1979-05-19 | 1979-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-17 | 1983-05-19 | 1983-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-17 | 1987-05-19 | 1987-11-18 | $7700.00 | Window Closed / Lapsed |