US3820767A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for the treatment of molten metal
Assignee: Arcelor Luxembourg SA
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Filing: 1972-02-02
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Granted: 1974-06-28
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Expires: 1992-02-02
Abstract
Abstract An apparatus for the treatment of molten metals, e.g., cast iron or steel in a vessel such as a furnace or ladle wherein an upwardly moving stream of the molten is induced by confining a column thereof and injecting a gas beneath this column into the melt. A treatment receptable is located above the column which, in turn, may be separated from any slag layer overlying the bath, the receptacle having a downwardly moving column returning the metal to the bath. The receptacle may be maintained at a pressure other than atmospheric or may be open to the atmosphere.
Inventors
- 👤 P Metz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 05:42
CPC Classifications
C; C21; C21C; C21C7/00; C21C7/10
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
235 words
An apparatus for the treatment of molten metal, comprising: a receptacle for a unitary bath of molten metal overlain by a layer of slag or dross; a treatment vessel comprising a treatment cell of a relatively large horizontal cross-section adapted to receive a quantity of molten metal to be treated, and a pair of upright tubes of horizontal cross-sections smaller than that of said cell leading downwardly from said cell and terminating below said layer in said bath, both said tubes communicating with the interior of said cell and being immersed in said bath at spaced-apart locations within said receptacle; means for injecting fine bubbles of a gas into the molten metal below one of said tubes to induce a flow of molten metal upwardly through said one of said tubes, through said cell and downwardly through the other of said tubes whereby molten metal may be treated in said cell without intervention of said layer; means for treating the molten metal in said cell, said one of said tubes having a mouth opening into said bath at a location below the mouth of said other tube in said bath, said cell having a floor sloping downwardly from said one of said tubes toward said other of said tubes, said vessel being open to the atmosphere; and means for pressurizing the gas above said layer to support molten metal in said tubes and said vessel.
Claim 2
Independent Claim
235 words
An apparatus for the treatment of molten metal, comprising: a receptacle for a unitary bath of molten metal overlain by a layer of slag or dross; a treatment vessel comprising a treatment cell of a relatively large horizontal cross-section adapted to receive a quantity of molten metal to be treated, and a pair of upright tubes of horizontal cross-sections smaller than that of said cell leading downwardly from said cell and terminating below said layer in said bath, both said tubes communicating with the interior of said cell and being immersed in said bath at spaced-apart locations within said receptacle; means for injecting fine bubbles of a gas into the molten metal below one of said tubes to induce a flow of molten metal upwardly through said one of said tubes, through said cell and downwardly through the other of said tubes whereby molten metal may be treated in said cell without intervention of said layer; means for treating the molten metal in said cell, said one of said tubes having a mouth opening into said bath at a location below the mouth of said other tube in said bath, said cell having a floor sloping downwardly from said one of said tubes toward said other of said tubes, said vessel being open to the atmosphere; and means for pressurizing the gas above said layer to support molten metal in said tubes and said vessel.
Claim 3
Dependent Claim
21 words
The apparatus defined in claim 1, further comprising an electromagnetic pump for augmenting the circulation of molten metal through said vessel.
Claim 4
Dependent Claim
17 words
The apparatus defined in claim 1, further comprising means for heating the molten metal in said vessel.
Claim 5
Dependent Claim
25 words
The apparatus defined in claim 1, further comprising means for pulsing the flow rate of gas injected into said molten metal at a rapid frequency.
Claim 6
Dependent Claim
24 words
The apparatus defined in claim 1, further comprising means for intermittently varying the molten metal level in one of said cell and said receptacle.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-27 | 1977-12-27 | 1978-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-27 | 1981-12-27 | 1982-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-27 | 1985-12-27 | 1986-06-28 | $7700.00 | Window Closed / Lapsed |