US4214899A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for the addition of a reactive metal to a molten metal bath
Assignee: Elkem Metals Co LP
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Filing: 1979-03-09
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Granted: 1980-07-29
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Expires: 1999-03-09
Abstract
Abstract A method for the addition of a reactive metal to a molten metal bath wherein the vapor pressure of the reactive metal at the bath temperature exceeds the total ambient pressure above the surface of the bath by establishing a gaseous atmosphere containing a nonreactive gas and a small quantity of SF6 above the surface of the bath so as to increase the recovery of the reactive metal addition in the bath.
Inventors
- 👤 Ronald H. Radzilowski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 21:07
CPC Classifications
C; C21; C21C; C21C1/00; C21C1/02; C21C1/10; C22; C22B; C22B9/00; C22B9/10; C22B9/103; C22C; C22C33/00; C22C33/08; C22C33/10
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
102 words
A method for the addition of a reactive metal to a molten metal bath which comprises: (a) providing a bath of molten metal; (b) establishing a gaseous atmosphere above the surface of said bath consisting essentially of a nonreactive gas containing from about 100 to 3000 parts per million SF 6 ; (c) establishing said bath of molten metal at a temperature at which a selected reactive metal exhibits a vapor pressure exceeding the total ambient pressure of the gaseous atmosphere above the surface of said bath; (d) depositing said selected reactive metal on the surface of said bath for dissolution therein.
Claim 2
Independent Claim
102 words
A method for the addition of a reactive metal to a molten metal bath which comprises: (a) providing a bath of molten metal; (b) establishing a gaseous atmosphere above the surface of said bath consisting essentially of a nonreactive gas containing from about 100 to 3000 parts per million SF 6 ; (c) establishing said bath of molten metal at a temperature at which a selected reactive metal exhibits a vapor pressure exceeding the total ambient pressure of the gaseous atmosphere above the surface of said bath; (d) depositing said selected reactive metal on the surface of said bath for dissolution therein.
Claim 3
Dependent Claim
23 words
A method in accordance with claim 1 wherein said reactive metal is selected from the group consisting of magnesium, calcium, strontium and barium.
Claim 4
Dependent Claim
15 words
A method in accordance with claim 2 wherein said bath consists essentially of molten ferrosilicon.
Claim 5
Dependent Claim
13 words
A method in accordance with claim 1 wherein said reactive metal is magnesium.
Claim 6
Dependent Claim
20 words
A method in accordance with claim 1 wherein said SF 6 ranges from about 1000 to 2000 parts per million.
Claim 7
Dependent Claim
24 words
A method in accordance with claim 1 wherein said nonreactive gas is selected from the group consisting of nitrogen, argon, carbon dioxide and helium.
Claim 8
Dependent Claim
21 words
A method in accordance with claim 1 wherein said nonreactive gas is selected from the group consisting of nitrogen and argon.
Claim 9
Independent Claim
138 words
A method for the addition of a reactive metal to a molten ferrosilicon bath which comprises: (a) providing a bath of molten ferrosilicon (b) establishing a gaseous atmosphere above the surface of said bath consisting essentially of a nonreactive gas containing from about 100 to 3000 parts per million SF 6 wherein said nonreactive gas is selected from the group consisting of nitrogen, argon, carbon dioxide and helium; (c) establishing said bath of molten ferrosilicon at a temperature at which a reactive metal selected from the group consisting of magnesium, calcium, strontium and barium exhibits a vapor pressure exceeding the total ambient pressure of the gaseous atmosphere above the surface of said bath; (d) depositing said reactive metal selected from the group consisting of magnesium, calcium, strontium and barium on the surface of said bath for dissolution therein.
Claim 10
Independent Claim
138 words
A method for the addition of a reactive metal to a molten ferrosilicon bath which comprises: (a) providing a bath of molten ferrosilicon (b) establishing a gaseous atmosphere above the surface of said bath consisting essentially of a nonreactive gas containing from about 100 to 3000 parts per million SF 6 wherein said nonreactive gas is selected from the group consisting of nitrogen, argon, carbon dioxide and helium; (c) establishing said bath of molten ferrosilicon at a temperature at which a reactive metal selected from the group consisting of magnesium, calcium, strontium and barium exhibits a vapor pressure exceeding the total ambient pressure of the gaseous atmosphere above the surface of said bath; (d) depositing said reactive metal selected from the group consisting of magnesium, calcium, strontium and barium on the surface of said bath for dissolution therein.
Claim 11
Dependent Claim
20 words
A method in accordance with claim 8 wherein said SF 6 ranges from about 1000 to 2000 parts per million.
Claim 12
Dependent Claim
21 words
A method in accordance with claim 8 wherein said nonreactive gas is selected from the group consisting of nitrogen and argon.
Claim 13
Independent Claim
95 words
A method for the addition of magnesium to a molten ferrosilicon bath which comprises: (a) providing a bath of molten ferrosilicon; (b) establishing a gaseous atmosphere above the surface of said bath consisting essentially of a nonreactive gas containing from about 100 to 3000 parts per million SF 6 ; (c) establishing said bath of ferrosilicon at a temperature at which said magnesium exhibits a vapor pressure exceeding the total ambient pressure of the gaseous atmosphere above the surface of said bath; (d) depositing said magnesium on the surface of said bath for dissolution therein.
Claim 14
Independent Claim
95 words
A method for the addition of magnesium to a molten ferrosilicon bath which comprises: (a) providing a bath of molten ferrosilicon; (b) establishing a gaseous atmosphere above the surface of said bath consisting essentially of a nonreactive gas containing from about 100 to 3000 parts per million SF 6 ; (c) establishing said bath of ferrosilicon at a temperature at which said magnesium exhibits a vapor pressure exceeding the total ambient pressure of the gaseous atmosphere above the surface of said bath; (d) depositing said magnesium on the surface of said bath for dissolution therein.
Claim 15
Dependent Claim
20 words
A method in accordance with claim 11 wherein said SF 6 ranges from about 1000 to 2000 parts per million.
Claim 16
Dependent Claim
24 words
A method in accordance with claim 11 wherein said nonreactive gas is selected from the group consisting of nitrogen, argon, carbon dioxide and helium.
Claim 17
Dependent Claim
21 words
A method in accordance with claim 11 wherein said nonreactive gas is selected from the group consisting of nitrogen and argon.
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) | 1983-07-29 | 1984-01-28 | 1984-07-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-07-29 | 1988-01-28 | 1988-07-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-07-29 | 1992-01-28 | 1992-07-29 | $7700.00 | Window Closed / Lapsed |