Patent US3856650A successfully refreshed from Google Patents.
US3856650A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cathode for an aluminium fusion electrolysis cell and method of making the same
Assignee: Rio Tinto Switzerland AG
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Filing: 1973-03-19
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Granted: 1974-12-24
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Expires: 1993-03-19
Abstract
Abstract The invention relates to a cathode for an aluminium fusion electrolysis cell, particularly to a cathode in the form of a pot, comprising walls of electrically conducting material and a coating on the inner surface of the walls of a ceramic material which is electrically conducting and insoluble in fused cryolite and in molten aluminium and further to a method of making a pot in which the ceramic material is applied in finely dispersed form with such energy as to produce adhesion between the ceramic material and the inner surface of the pot and consolidation of the ceramic material.
Inventors
- 👤 T Kugler
- 👤 H Rieger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:25
CPC Classifications
C; C25; C25C; C25C3/00; C25C3/06; C25C3/08; G; G01; G01D; G01D2205/00; G01D2205/20; G01D2205/26; Y; Y02; Y02P; Y02P10/00; Y02P10/25
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
87 words
A POT SUITABLE FOR USE AS THE CATHODE OF AN ALUMINUM FUSION ELECTRLYSIS CELL, COMPRIS9NG A HEAT INSULATING OUTER SHELL AND, ON THE INTERIOR THEREOF, AN INNER CHAMBER HAVING WALLS OF ELECTRICALLY CONDUCTIVE MATERIAL, AND AN INNER PROTECTIVE THIN LINING COMPRISING COMPACTED INTERFUSED PARTICLES STRONGLY ADHERING TO THE INNER SURFACE OF SAID CHAMBER WALLS AND ADAPTED TO BE IN CONTACT WITH THE MELT, SAID LINING BEING COMPOSED OF A CERAMIC MATERIAL WHICH IS ELECTRICALLY CONDUCTIVE AND INSOLUBLE IN A MELT OF FUSED CRYOLITE AND IN MOLTEN ALUMINUM.
Claim 2
Dependent Claim
87 words
A POT SUITABLE FOR USE AS THE CATHODE OF AN ALUMINUM FUSION ELECTRLYSIS CELL, COMPRIS9NG A HEAT INSULATING OUTER SHELL AND, ON THE INTERIOR THEREOF, AN INNER CHAMBER HAVING WALLS OF ELECTRICALLY CONDUCTIVE MATERIAL, AND AN INNER PROTECTIVE THIN LINING COMPRISING COMPACTED INTERFUSED PARTICLES STRONGLY ADHERING TO THE INNER SURFACE OF SAID CHAMBER WALLS AND ADAPTED TO BE IN CONTACT WITH THE MELT, SAID LINING BEING COMPOSED OF A CERAMIC MATERIAL WHICH IS ELECTRICALLY CONDUCTIVE AND INSOLUBLE IN A MELT OF FUSED CRYOLITE AND IN MOLTEN ALUMINUM.
Claim 3
Dependent Claim
22 words
The pot according to claim 1, in which said walls are of a metal resistant to the service temperature of the cell.
Claim 4
Dependent Claim
13 words
The pot according to claim 2, in which said walls are Cr-Ni steel.
Claim 5
Dependent Claim
36 words
The pot as claimed in claim 1, wherein said ceramic material is selected from the group consisting of borides, carbides, nitrides and silicides of a metal in the 4th to 6th groups of the periodic system.
Claim 6
Dependent Claim
18 words
The pot according to claim 4, in which the ceramic material is either titanium diboride or zirconium diboride.
Claim 7
Dependent Claim
19 words
The pot according to claim 1, in which the thickness of the lining amounts to at least 0.1 mm.
Claim 8
Dependent Claim
19 words
The pot according to claim 6, in which the thickness of the lining is between 0.5 and 1.0 mm.
Claim 9
Dependent Claim
25 words
The pot according to claim 1, further comprising a grating of material insoluble in molten aluminum and cryolite, supported on the floor of the chamber.
Claim 10
Dependent Claim
30 words
The pot according to claim 8, in which the grating consists of rows of tile-like plates, the rows being space apart and extending parallel to one another along the floor.
Claim 11
Dependent Claim
15 words
The pot according to claim 9, in which the grating consists of a ceramic material.
Claim 12
Dependent Claim
14 words
The pot according to claim 10, in which the grating consists of sintered corundum.
Claim 13
Dependent Claim
84 words
In a method of lining with ceramic material the inner surface of the conductive inner chamber of a cell pot adapted for use as the cathode of an aluminum fusion electrolysis cell, the steps comprising introducing said ceramic material in finely dispersed form into a plasma high speed high temperature stream, and subsequently discharging said stream towards said inner surface with sufficient energy to produce adhesion between said ceramic material and said inner surface of said inner chamber and consolidation of said ceramic material.
Claim 14
Dependent Claim
84 words
In a method of lining with ceramic material the inner surface of the conductive inner chamber of a cell pot adapted for use as the cathode of an aluminum fusion electrolysis cell, the steps comprising introducing said ceramic material in finely dispersed form into a plasma high speed high temperature stream, and subsequently discharging said stream towards said inner surface with sufficient energy to produce adhesion between said ceramic material and said inner surface of said inner chamber and consolidation of said ceramic material.
Claim 15
Dependent Claim
55 words
The method as claimed in claim 12, wherein said ceramic material is supplied in an ionized gas stream of high energy content, and, by means of the energy existing in the gas stream, the ceramic material being discharged in molten condition whereby the ceramic material is bonded to said inner surface and simultaneously is consolidated.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-12-23 | 1978-06-24 | 1978-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-23 | 1982-06-24 | 1982-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-23 | 1986-06-24 | 1986-12-24 | $7700.00 | Window Closed / Lapsed |