AU2011204684C1 - Cathode with replaceable assembly for retarding flow in aluminum electrolytic cell - Google Patents
Cathode with replaceable assembly for retarding flow in aluminum electrolytic cell Download PDFInfo
- Publication number
- AU2011204684C1 AU2011204684C1 AU2011204684A AU2011204684A AU2011204684C1 AU 2011204684 C1 AU2011204684 C1 AU 2011204684C1 AU 2011204684 A AU2011204684 A AU 2011204684A AU 2011204684 A AU2011204684 A AU 2011204684A AU 2011204684 C1 AU2011204684 C1 AU 2011204684C1
- Authority
- AU
- Australia
- Prior art keywords
- cathode
- electrolytic cell
- retarding flow
- aluminum
- choking
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 39
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 39
- 230000000979 retarding effect Effects 0.000 title abstract description 10
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 11
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 11
- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O KZHJGOXRZJKJNY-UHFFFAOYSA-N 0.000 claims abstract description 6
- 229910052863 mullite Inorganic materials 0.000 claims abstract description 6
- 229910052596 spinel Inorganic materials 0.000 claims abstract description 6
- 239000011029 spinel Substances 0.000 claims abstract description 6
- GFQYVLUOOAAOGM-UHFFFAOYSA-N zirconium(iv) silicate Chemical compound [Zr+4].[O-][Si]([O-])([O-])[O-] GFQYVLUOOAAOGM-UHFFFAOYSA-N 0.000 claims abstract description 6
- 230000009467 reduction Effects 0.000 claims description 26
- 230000005484 gravity Effects 0.000 claims description 6
- 230000000694 effects Effects 0.000 abstract description 10
- 238000005260 corrosion Methods 0.000 abstract description 6
- 230000007797 corrosion Effects 0.000 abstract description 6
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 239000000463 material Substances 0.000 abstract description 6
- 239000003792 electrolyte Substances 0.000 abstract description 5
- 230000000712 assembly Effects 0.000 abstract 1
- 238000000429 assembly Methods 0.000 abstract 1
- 238000005265 energy consumption Methods 0.000 abstract 1
- 229910052845 zircon Inorganic materials 0.000 abstract 1
- 238000013459 approach Methods 0.000 description 4
- 238000013461 design Methods 0.000 description 3
- 238000009991 scouring Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000005094 computer simulation Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000003313 weakening effect Effects 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25C—PROCESSES FOR THE ELECTROLYTIC PRODUCTION, RECOVERY OR REFINING OF METALS; APPARATUS THEREFOR
- C25C3/00—Electrolytic production, recovery or refining of metals by electrolysis of melts
- C25C3/06—Electrolytic production, recovery or refining of metals by electrolysis of melts of aluminium
- C25C3/08—Cell construction, e.g. bottoms, walls, cathodes
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Electrolytic Production Of Metals (AREA)
Abstract
A cathode with a replaceable assembly for retarding flow in an aluminum electrolytic cell is disclosed, which comprises a cathode carbon block (1) arranged at the bottom of the aluminum electrolytic cell and a cathode assembly (2) for retarding flow arranged on the surface of the cathode carbon block. The cathode assembly (2) for retarding flow is made from a material with high temperature resistance, corrosion resistance and large density such as mullite, spinel or zircon. The cross section of the cathode assembly (2) for retarding flow is in the shape of semicircle, arc or streamline. The height of the cathode assembly for retarding flow is in a range of 50-150 mm, and the width is in a range of 100-300 mm. The cathode assembly (2) for retarding flow is in the form of long strip or block. The cathode assembly(2) for retarding flow is arranged in the longitudinal direction of the cathode in the electrolytic cell, and each group has one or more cathode assemblies(2) for retarding flow. The stability of the interface between the aluminum solution and the electrolyte is properly improved in the aluminum electrolytic cell, and then the polar distance is effectively reduced during normal production. A lower working voltage thus obtained in the electrolytic cell will in turn lead to an effect of saving and reducing energy consumption.
Description
To: 0262837999
Fri 29 Jun 2012 04:38:45 PM EST (GMT+10)
Page 4 of 13
CATHODE WITH REPLACEABLE ASSEMBLY FOR RETARDING FLOW IN ALUMINUM ELECTROLYTIC CELL
Field of the Invention 5 The present invention relates to replaceable cathode choking devices of an aluminum reduction cell, pertaining to the technical field of aluminum reduction cell.
Background of the Invention 10 With improvement of design and operating technical level of the aluminum reduction cell, the international or domestic newly designed and constructed aluminum reduction cells are increasingly developed to be large-scale ones. Potline current will inevitability increase to 550kA~700kA, or even more. In recent years, the domestic technology of aluminum 15 reduction has achieved great development, whereby the capacity of the reduction cell has already caught up with or even exceeded the international advanced level. However, there is relative large disparity in terms of energy saving and consumption reducing compared to the world’s advanced level. Currently, each of domestic aluminum factories has a DC consumption of 20 around 13 200-3 500kWh/T.Al, some of which even approach 14000kWh/T.Ah There is considerable potential to reduce the consumption. Especially in the case of current extremely severe economic conditions at home and aboard, the requirement of energy saving is much more imperative. 25 Recently, many designs take the approaches of adding bosses or placing choking devices on cathode surfaces in order to achieve an object of improving flow velocity, lowering molten aluminum-electrolyte interface, decreasing polar distance, and saving energy and reducing consumption. Due to the method of placing choking devices, these approaches are not 30 only suitable for constructing new cells and complete overhauling the cells, but also capable of being used in on-line production cells, thereby obtaining a relatively large-scaled popularization. However, these approaches have a -1 - COMS ID No: ARCS-376161 Received by IP Australia: Time (H:m) 16:47 Date (Y-M-d) 2012-06-29
To: 0262837999
Fri 29 Jun 2012 04:38:45 PM EST (GMT+10)
Page 5 of 13 problem in that; when some of the choking devices are put into service or replaced, the positions of remaining choking devices may be offset under a scouring action of molten aluminum, influencing the actual choking effect. One of the designs (e.g., patent application of CN20081018106.2) fixes the 5 choking devices by means of machining bores or channels in cathode surfaces, but this would increase the cost of choking grooves.
The present invention alters a cross-sectional shape of the choking devices, enabling them to generate a downward pressure when subjected to the scouring of molten aluminum and to stabilize on cathode surfaces. At 10 the same time, the choking devices with such a cross-sectional shape have a better choking effect than ordinary choking devices.
Summary of the Invention
The technical problem to be solved by the present invention is to 15 provide replaceable cathode choking devices of an aluminum reduction cell. These devices can be adapted to various production conditions and firmly placed on cathode surfaces of the aluminum reduction cell, enabling the aluminum reduction cell to achieve good stability, realizing the effect of energy saving and consumption reduction, so as to overcome the shortages 20 of the position offsetting and hence the influence on actual choking effect present in the prior art.
The technical solution of the present invention is as follows: it comprises cathode carbon blocks and cathode choking devices placed at the bottom of the aluminum reduction cell, wherein the cathode choking 25 devices are placed on surfaces of the cathode carbon blocks, and the cathode choking devices are made of mullite, spinel or zirconite which is high temperature resistant, corrosion resistant and of high specific gravity.
The cathode choking devices have a cross-section of semicircular, arc or streamline shaped. 30
The cathode choking devices have a height of 50-150mm and a width of 100~300mm. - 2 - COMS ID No: ARCS-376161 Received by IP Australia: Time (H:m) 16:47 Date (Y-M-d) 2012-06-29
To: 0262837999
Fri 29 Jun 2012 04:38:45 PM EST CCMT+10)
Page 6 of 13
The cathode choking devices are elongated block-shaped.
The cathode choking devices arc placed in a direction along a long side of a cathode of the reduction cell, wherein each group of the cathode choking devices can be one or more cathode choking devices. 5 Existing choking devices are generally elongated devices with a rectangular or trapezoidal cross-section. The choking devices are placed on the cathode surfaces of the aluminum reduction cell, in order to eliminate vortices generated by existing cathode carbon blocks, Through tests and calculation analyses, it can be known that this will destroy the distribution 10 of flow velocity field generated by an electromagnetic force of the existing aluminum reduction cell, breaking the field into pieces and preventing the molten aluminum from generating relative large rises and fluctuations, thereby achieving a better stability. Hence a further effect of energy saving and consumption reduction is achieved. However, the existing choking 15 devices have a problem in that: 1) the choking devices may be offset due to the scouring of fluid; 2) due to the shape characteristics of the existing choking devices, they will allow the molten aluminum to flow through areas near two comers of the top surfaces thereof, generating certain vortex, thus weakening the choking effect. The cross-section of the choking devices of 20 the present invention is obtained after a large number of experiments and computer simulations. When these devices are put into an in-production aluminum reduction cell, they can be firmly fixed on the cathode surfaces due to downward forces generated locally. At the same time, a smooth surface structure thereof can also reduce turbulence of the molten 25 aluminum as much as possible, so as to obtain a better choking effect. Material of mullite, spinel or zirconite, which is high temperature resistant (i> 1ÖÖ0°C), molten aluminum and electrolyte corrosion resistant and of higher specific gravity than molten aluminum, can be used for making the present choking devices. Therefore, the present invention has advantages of 30 less modification to the reduction cell, good energy saving effect and broad applications, etc., and has excellent economic benefits, popularization values and use values. COMS ID No: ARCS-376161 Received by IP Australia: Time (H:m) 16:47 Date (Y-M-d) 2012-06-29
To: 0262837999
Fri 29 Jun 2012 04:38:45 PM E5T (GMT+10)
Page 7 of 13
Brief Description of the Drawings
Fig. 1 is a schematic view of the prior art;
Fig.2 is a schematic perspective view of the configuration of the 5 present invention;
Fig.3 is a Y-direction view of Fig.2;
Fig.4 is an X-direction view of Fig.2;
Fig. 5 is a schematic view of placing multiple groups of cathode choking devices of the present invention; 10
Detailed Description of the Invention
Embodiment of the present invention: the present invention comprises cathode carbon blocks 1 and cathode choking devices 2 placed at the bottom of an aluminum reduction cell, wherein the cathode choking devices 15 2 are placed on surfaces of the cathode carbon blocks, and the cathode choking devices 2 are made of mullite, spinel or zirconite which is high temperature resistant, corrosion resistant and of high specific gravity.
The cathode choking devices 2 have a cross-section of semicircular, arc or streamline shaped. 20 The cathode choking devices have a height of 50—150mm and a width of 100~300mm. Generally, the height is 100mm and the width is 200mm.
The cathode choking devices 2 are elongated block-shaped.
The cathode choking devices 2 are placed in a direction along a long side of a cathode of the reduction cell, wherein each group of the cathode 25 choking devices can be one or more cathode choking devices 2.
As shown in Fig.2, the cathode carbon blocks 1 are placed at the bottom of an aluminum reduction cell. The cathode choking devices 2 are 30 placed on the surfaces of the cathode carbon blocks 1. The cross-section of the choking devices is semicircular (as shown in Fig.3), or arc-shaped or streamline shaped (parabolic or hyperbolic shapes, etc) and the like. The - 4 - COMS ID No: ARCS-376161 Received by IP Australia: Time (H:m) 16:47 Date (Y-M-d) 2012-06-29
To: 0262837999
Fri 29 Jun 2012 04:38:45 PM EST (GMT+10)
Page 8 of 13 choking devices are placed in a direction along a long side of the surfaces of the cathode carbon blocks (as shown in Figs. 2, 4 and 5), each of which surfaces can be used for placing one group, two groups (as shown in Fig.4) or multiple groups (as shown in Fig.5) of cathode choking devices. The 5 cathode choking devices are made of a material which is high temperature resistant, molten aluminum and electrolyte corrosion resistant and of higher specific gravity than molten aluminum. The aforementioned material is current commonly used material and would not increase too much cost. The height and width of the choking devices are required to be 50~200mm and 10 100~300mm, respectively. During normal production, the molten aluminum should overflow these choking devices by 30-150mm. Then protruding portions of the molten aluminum can well destroy the flow field of the molten aluminum, increasing the stability of the aluminum reduction cell, and can further reduce the polar distance during the normal production, 15 realizing the effect of energy saving and consumption reduction.
Said material which is high temperature resistant (2 1000°C), (molten aluminum and electrolyte) corrosion resistant and of high specific gravity (> 3) is mullite, spinel, zirconite, etc. 20 - 5 - COMS ID No: ARCS-376161 Received by IP Australia: Time (H:m) 16:47 Date (Y-M-d) 2012-06-29
Claims (5)
- THE CLAIMS DEFINING THE INVENTION ARE AS FOLLOWS:1. A replaceable cathode choking device for use in an aluminum reduction cell, in use the choking device configured to be placed on a surface of a carbon cathode block located at the bottom of the aluminum reduction cell, wherein the cathode choking device has a higher specific gravity than molten aluminum.
- 2. The replaceable cathode choking device of claim 1 made of mullite, spinel or zirconite.
- 3. The replaceable cathode choking device according to claim 1 or claim 2, characterized in that: the cathode choking device has a semicircular cross-section , or is of a streamlined shape.
- 4. The replaceable cathode choking device according to any one of claims 1 to 3, characterized in that: the cathode choking device has a height of 50-150mm and a width of 100-300mm.
- 5. The replaceable cathode choking device of an aluminum reduction cell according to any one of claims 1 to 4, characterized in that: the cathode choking device is configured to be placed in a direction along a long side of a cathode of the reduction cell, such that in use one or more cathode choking devices can be placed as a group.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010103000772A CN102121116A (en) | 2010-01-07 | 2010-01-07 | Replaceable cathode flow blocking device for aluminum electrolysis cell |
| CN201010300077.2 | 2010-01-07 | ||
| PCT/CN2011/000028 WO2011082658A1 (en) | 2010-01-07 | 2011-01-06 | Cathode with replaceable assembly for retarding flow in aluminum electrolytic cell |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| AU2011204684A1 AU2011204684A1 (en) | 2012-07-26 |
| AU2011204684B2 AU2011204684B2 (en) | 2014-01-30 |
| AU2011204684C1 true AU2011204684C1 (en) | 2016-10-27 |
Family
ID=44249777
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU2011204684A Active AU2011204684C1 (en) | 2010-01-07 | 2011-01-06 | Cathode with replaceable assembly for retarding flow in aluminum electrolytic cell |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US20130233704A1 (en) |
| CN (1) | CN102121116A (en) |
| AU (1) | AU2011204684C1 (en) |
| CA (1) | CA2785873C (en) |
| MY (1) | MY160365A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102766884A (en) * | 2012-07-10 | 2012-11-07 | 沈阳北冶冶金科技有限公司 | Aluminum cell cathode carbon block with cylindrical grooves on upper surface and manufacturing method of aluminum cell cathode carbon block |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4631121A (en) * | 1986-02-06 | 1986-12-23 | Reynolds Metals Company | Alumina reduction cell |
| CN201261809Y (en) * | 2008-08-12 | 2009-06-24 | 高德金 | Cathode inner lining with molten aluminum magnetic vortex stream adjustment device |
| CN101580949A (en) * | 2009-06-24 | 2009-11-18 | 中国铝业股份有限公司 | Method for improving stability of aluminum electrolytic bath |
| CN201367467Y (en) * | 2009-03-03 | 2009-12-23 | 沈阳铝镁设计研究院 | Energy-saving consumption-reducing electrolysis bath |
| CN201367472Y (en) * | 2009-03-05 | 2009-12-23 | 沈阳铝镁设计研究院 | Cathode structure of aluminium electrolysis bath of bath bottom tapping |
-
2010
- 2010-01-07 CN CN2010103000772A patent/CN102121116A/en active Pending
-
2011
- 2011-01-06 MY MYPI2012003093A patent/MY160365A/en unknown
- 2011-01-06 US US13/520,936 patent/US20130233704A1/en not_active Abandoned
- 2011-01-06 AU AU2011204684A patent/AU2011204684C1/en active Active
- 2011-01-06 CA CA2785873A patent/CA2785873C/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4631121A (en) * | 1986-02-06 | 1986-12-23 | Reynolds Metals Company | Alumina reduction cell |
| CN201261809Y (en) * | 2008-08-12 | 2009-06-24 | 高德金 | Cathode inner lining with molten aluminum magnetic vortex stream adjustment device |
| CN201367467Y (en) * | 2009-03-03 | 2009-12-23 | 沈阳铝镁设计研究院 | Energy-saving consumption-reducing electrolysis bath |
| CN201367472Y (en) * | 2009-03-05 | 2009-12-23 | 沈阳铝镁设计研究院 | Cathode structure of aluminium electrolysis bath of bath bottom tapping |
| CN101580949A (en) * | 2009-06-24 | 2009-11-18 | 中国铝业股份有限公司 | Method for improving stability of aluminum electrolytic bath |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102121116A (en) | 2011-07-13 |
| CA2785873A1 (en) | 2011-07-14 |
| AU2011204684A1 (en) | 2012-07-26 |
| US20130233704A1 (en) | 2013-09-12 |
| MY160365A (en) | 2017-02-28 |
| CA2785873C (en) | 2014-05-06 |
| AU2011204684B2 (en) | 2014-01-30 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FGA | Letters patent sealed or granted (standard patent) | ||
| DA2 | Applications for amendment section 104 |
Free format text: THE NATURE OF THE AMENDMENT IS AS SHOWN IN THE STATEMENT(S) FILED 22 JUL 2016 . |
|
| DA3 | Amendments made section 104 |
Free format text: THE NATURE OF THE AMENDMENT IS AS SHOWN IN THE STATEMENT(S) FILED 22 JUL 2016 |