US3871872A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for promoting metallurgical reactions in molten metal
Assignee: Elkem Metals Co LP
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Filing: 1973-05-30
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Granted: 1975-03-18
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Expires: 1993-05-30
Abstract
Abstract Method and apparatus for promoting metallurgical reactions in molten metal employing high speed stirring.
Inventors
- 👤 James H Downing
- 👤 Robert H Kaiser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:21
CPC Classifications
F; F27; F27D; F27D27/00; C; C01; C01B; C01B33/00; C01B33/02; C01B33/037; C21; C21C; C21C7/00; C21C7/04; C21C7/076; C22; C22B; C22B9/00; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
187 words
A METHOD FOR REFINING MOLTEN METAL CONTAINING IMPURITIES WHICH COMPRISES I. INTRODUCING MOLTEN METAL INTO A SUBSTANTIALLY CYLINDRICALLY SHAPED VESSEL II. AGITATING THE MOLTEN METAL IN SAID VESSEL BY MEANS OF A GRAPHITE ROTATING AGITATING MEMBER SUBSTANTIALLY CENTRALLY AND AXIALLY ALIGNED WITHIN SAID VESSEL WITH THE BOTTOM PORTION OF SAID AGITATING MEMBER BEING IN THE UPPER 50 PERCENT OF THE HEIGHT OF THE METAL BATH, SAID AGITATING MEMBER BEING ROTATED AT A SPEED OF FROM ABOUT 120 TO 225 R.P.M. TO PROVIDE TURBULENT AGITATION AT LEAST AT THE SURFACE OF THE METAL BATH AND SAID AGITATING MEMBER COMPRISING A SUBSTANTIALLY CYLINDRICAL HUB PORTION HAVING FROM THREE TO EIGHT RADIAL EXTENSION,THE LENGTH OF SAID RACIAL EXTENSIONS BEING FROM ABOUT 25 TO 85 PERCENT OF THE DIAMETER OF THE HUB, THE WIDTH OF SAID RADIAL EXTENSIONS BEING ABOUT 40 TO 80 PERCENT OF THEIR LENGTH, AND THE HEIGHT OF SAID RADIAL EXTENSIONS BEING FROM ABOUT 75 TO 200 PERCENT OF THE HUB DIAMETER AND THE DIAMETER OF A CIRCLE CIRCUMSCRIBING SAID RIDIAL EXTENSIONS BEING ABOUT 25 TO 40 PERCENT OF THE DIAMETER OF SAID VESSEL CONTAINING SAID MOLTEN METAL.
Claim 2
Independent Claim
187 words
A METHOD FOR REFINING MOLTEN METAL CONTAINING IMPURITIES WHICH COMPRISES I. INTRODUCING MOLTEN METAL INTO A SUBSTANTIALLY CYLINDRICALLY SHAPED VESSEL II. AGITATING THE MOLTEN METAL IN SAID VESSEL BY MEANS OF A GRAPHITE ROTATING AGITATING MEMBER SUBSTANTIALLY CENTRALLY AND AXIALLY ALIGNED WITHIN SAID VESSEL WITH THE BOTTOM PORTION OF SAID AGITATING MEMBER BEING IN THE UPPER 50 PERCENT OF THE HEIGHT OF THE METAL BATH, SAID AGITATING MEMBER BEING ROTATED AT A SPEED OF FROM ABOUT 120 TO 225 R.P.M. TO PROVIDE TURBULENT AGITATION AT LEAST AT THE SURFACE OF THE METAL BATH AND SAID AGITATING MEMBER COMPRISING A SUBSTANTIALLY CYLINDRICAL HUB PORTION HAVING FROM THREE TO EIGHT RADIAL EXTENSION,THE LENGTH OF SAID RACIAL EXTENSIONS BEING FROM ABOUT 25 TO 85 PERCENT OF THE DIAMETER OF THE HUB, THE WIDTH OF SAID RADIAL EXTENSIONS BEING ABOUT 40 TO 80 PERCENT OF THEIR LENGTH, AND THE HEIGHT OF SAID RADIAL EXTENSIONS BEING FROM ABOUT 75 TO 200 PERCENT OF THE HUB DIAMETER AND THE DIAMETER OF A CIRCLE CIRCUMSCRIBING SAID RIDIAL EXTENSIONS BEING ABOUT 25 TO 40 PERCENT OF THE DIAMETER OF SAID VESSEL CONTAINING SAID MOLTEN METAL.
Claim 3
Dependent Claim
42 words
A method in accordance with claim 1 wherein the surface of the agitating member is provided with a thin adherent coating consisting essentially of about 45 t0 70% SiO2, 10 to 35% CaO, up to 30% MgO, and up to 15% Al2O3.
Claim 4
Dependent Claim
48 words
A method in accordance with claim 1 wherein the molten metal contains at least 50 percent silicon and calcium and aluminum impurities and wherein a slag is introduced into the molten metal containing vessel, said slag consisting essentially of about 45 to 70% SiO2, 10-35% CaO, 9-30% MgO.
References Cited (Backward Citations)
US3743263A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-17 | 1978-09-16 | 1979-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-17 | 1982-09-16 | 1983-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-17 | 1986-09-16 | 1987-03-18 | $7700.00 | Window Closed / Lapsed |