US4124476A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrolytic cell for the production of aluminium
Assignee: Individual
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Filing: 1977-06-13
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Granted: 1978-11-07
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Expires: 1997-06-13
Abstract
Abstract The amount of bulging and cracking in the carbon floor of an electrolytic reduction cell for the production of aluminium is reduced by the provision of a recess in the steel container which accommodates the carbon floor as it expands. The recess is filled with a first material which is easily compressible and a second material which deforms only at a relatively higher load and transmits the expansion forces to the steel container without producing any permanent deformation thereof.
Inventors
- 👤 Egon Rapolthy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 21:04
CPC Classifications
C; C25; C25C; C25C3/00; C25C3/06; C25C3/08; C07; C07C; C07C403/00; C07C403/14; C07C403/16; C07C45/00; C07C45/61; C07C45/67; C07C45/68; C07C49/00; C07C49/20; C07C49/21; C07C49/24; C07C49/242; C07C2601/00; C07C2601/12; C07C2601/16
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
158 words
An electrolytic cell for the production of aluminum, comprising in combination: a walled metal container defining a chamber, a carbon lining disposed within the container, and including a floor having an upper surface, and being normally susceptible to bulging and cracking during operation of the cell, said chamber accommodating the horizontal expansion of the floor of said container during operation of the cell, and first and second materials in contact with one another and filling said chamber, the first material extending between said carbon lining and at least one wall of said container and being relatively easily compressible, the second material extending between said carbon lining and at least one wall of said container and being compressible by a load which, while not causing any permanent deformation or cracking of the container, gives rise to a reaction force exerted on the floor of said carbon lining to counteract bulging and cracking of the floor of said carbon lining.
Claim 2
Dependent Claim
158 words
An electrolytic cell for the production of aluminum, comprising in combination: a walled metal container defining a chamber, a carbon lining disposed within the container, and including a floor having an upper surface, and being normally susceptible to bulging and cracking during operation of the cell, said chamber accommodating the horizontal expansion of the floor of said container during operation of the cell, and first and second materials in contact with one another and filling said chamber, the first material extending between said carbon lining and at least one wall of said container and being relatively easily compressible, the second material extending between said carbon lining and at least one wall of said container and being compressible by a load which, while not causing any permanent deformation or cracking of the container, gives rise to a reaction force exerted on the floor of said carbon lining to counteract bulging and cracking of the floor of said carbon lining.
Claim 3
Dependent Claim
21 words
An electrolytic cell according to claim 1, wherein said container is formed with an outwardly projecting peripheral bulge defining said chamber.
Claim 4
Dependent Claim
16 words
An electrolytic cell according to claim 2, wherein said bulge is releasably connected to said container.
Claim 5
Dependent Claim
18 words
An electrolytic cell according to claim 3, further comprising connecting means for connecting said bulge to said container.
Claim 6
Dependent Claim
13 words
An electrolytic cell according to claim 1, wherein said first material is wollastonite.
Claim 7
Dependent Claim
49 words
An electrolyte cell according to claim 1, wherein the floor of said carbon lining has a central zone, and wherein the reaction force is exerted by the second material below the upper surface of the floor of said carbon lining, but above the central zone of said carbon lining.
Claim 8
Dependent Claim
37 words
An electrolytic cell according to claim 1, wherein said second material includes two juxtaposed plates and a plurality of rods extending therebetween for absorbing the load, said rods being adapted to buckle upon application of the load.
Claim 9
Dependent Claim
71 words
An electrolytic cell according to claim 1, wherein said second material includes an assembly of ceramic bricks, each of the bricks having at least one longitudinal channel of predetermined cross-section and aligned in a direction at an angle to the direction of the reaction force, the cross-section of the channels of adjoining ones of said ceramic bricks increasing along the direction of the reaction force towards the center of said assembly.
Claim 10
Dependent Claim
63 words
An electrolytic cell according to claim 1, wherein said second material includes an assembly of ceramic bricks, each of said bricks having at least one longitudinal channel in a direction at an angle to the direction of the reaction force, the size of adjoining ones of said ceramic bricks decreasing along the direction of the reaction force towards the center of said assembly.
Claim 11
Dependent Claim
32 words
An electrolytic cell according to claim 1, wherein said second material includes at least one ceramic brick being tapered along the direction of the reaction force towards the center of said brick.
Claim 12
Dependent Claim
30 words
An electrolytic cell according to claim 10, wherein said ceramic brick is formed with a recess, and further comprising a bus bar serving as a cathode fitting into said recess.
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) | 1981-11-06 | 1982-05-08 | 1982-11-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-11-06 | 1986-05-08 | 1986-11-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-11-06 | 1990-05-08 | 1990-11-07 | $7700.00 | Window Closed / Lapsed |