Patent DE857555C successfully refreshed from Google Patents.
US3743263A
Expired / Lapsed
US
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Apparatus for refining molten aluminum
Assignee: Union Carbide Industrial Gases Technology Corp
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Filing: 1971-12-27
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Granted: 1973-07-03
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Expires: 1991-12-27
Abstract
Abstract The apparatus of the invention is capable of injecting gas in the form of small discrete bubbles into a mass of molten metal. The apparatus comprises a rotatable shaft coupled to drive means at its upper end and a vaned rotor at its lower end. Gas under sufficient pressure to be injected into the melt is fed into a passageway extending axially through the device whereby upon rotation of the rotor the gas is injected into the molten metal and subdivided into discrete gas bubbles. The process of the invention utilizes the above described gas injection apparatus for refining molten aluminum by introducing an inert gas into the metal beneath the surface of the melt.
Inventors
- 👤 A Szekely
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 00:41
CPC Classifications
C; C22; C22B; C22B9/00; B; B01; B01F; B01F23/00; B01F23/20; B01F23/23; B01F23/233; B01F23/2331; B01F23/23311; B01F23/2366; B01F23/2368; C22B21/00; C22B21/06; C22B21/066; B01F23/23314
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
26 words
a stationary sleeve surrounding said shaft and fixedly attached at its lower end to a vaned stator containing a plurality of vertical channels between said vanes,
Claim 2
Dependent Claim
39 words
The device of claim 1 wherein the induced circulation pattern is such as to transport the injected gas bubbles in a direction extending radially outward from the axis of said device with a downward component relative to said axis.
Claim 3
Dependent Claim
59 words
The device of claim 1 wherein the rotatable shaft contains a second passageway extending axially therethrough and is provided with a plurality of drillings which communicate with said axially extending passageway, formed by the inner surfaces of said sleeve and stator and the outer surface of said shaft, for conveying and discharging said gas into said mass of metal.
Claim 4
Dependent Claim
33 words
an axially extending passageway for conveying and discharging said gas into said mass of metal, formed by the inner surfaces of said sleeve and stator and the outer surface of said shaft, and
Claim 5
Dependent Claim
13 words
The device of claim 1 wherein the rotor and stator are of graphite.
Claim 6
Dependent Claim
80 words
means for providing gas to the upper end of said passageway under sufficient pressure to be injected into the melt, whereby upon rotation of said rotor and provision of said gas flow, the gas is injected into said molten metal and subdivided into discrete gas bubbles, and a circulation pattern of said molten metal is induced, which causes intensive stirring such that substantially the entire mass of molten metal in said enclosure comes into intimate contact with the gas bubbles.
Claim 7
Dependent Claim
95 words
Apparatus for refining molten aluminum, comprising in combination: (1) a gas injection device as set forth in claim 1, (2) an insulated vessel provided with entrance and exit means for the continuous flow of molten metal through said vessel, means for the discharging of gas from said vessel and (3) a vessel cover which seals said vessel to prevent infusion of air and moisture into said vessel, which enables said vessel to be operated under positive pressure and which has an opening therein into which said gas injection device is inserted in a sealed manner.
Claim 8
Dependent Claim
30 words
The apparatus of claim 5 wherein said vessel contains a plurality of refining zones each of which is provided with a gas injection device as set forth in claim 1.
References Cited (Backward Citations)
US3227547A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-02 | 1977-01-01 | 1977-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-02 | 1981-01-01 | 1981-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-02 | 1985-01-01 | 1985-07-03 | $7700.00 | Window Closed / Lapsed |