CN101255565A - aluminum cell graphite blanket baking method - Google Patents
aluminum cell graphite blanket baking method Download PDFInfo
- Publication number
- CN101255565A CN101255565A CNA2007101796526A CN200710179652A CN101255565A CN 101255565 A CN101255565 A CN 101255565A CN A2007101796526 A CNA2007101796526 A CN A2007101796526A CN 200710179652 A CN200710179652 A CN 200710179652A CN 101255565 A CN101255565 A CN 101255565A
- Authority
- CN
- China
- Prior art keywords
- roasting
- graphite
- baking method
- aluminum cell
- blanket
- 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.)
- Pending
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 41
- 238000000034 method Methods 0.000 title claims abstract description 35
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 27
- 229910002804 graphite Inorganic materials 0.000 title claims description 34
- 239000010439 graphite Substances 0.000 title claims description 34
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical compound [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 title claims description 15
- 239000007770 graphite material Substances 0.000 claims abstract description 13
- 238000010438 heat treatment Methods 0.000 claims abstract description 9
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 abstract description 12
- 229910052799 carbon Inorganic materials 0.000 abstract description 7
- 239000003610 charcoal Substances 0.000 description 10
- 239000004411 aluminium Substances 0.000 description 6
- 238000001354 calcination Methods 0.000 description 4
- 239000000571 coke Substances 0.000 description 4
- 239000002245 particle Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000004939 coking Methods 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005868 electrolysis reaction Methods 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 208000037656 Respiratory Sounds Diseases 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000011449 brick Substances 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 230000008642 heat stress Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Landscapes
- Electrolytic Production Of Metals (AREA)
Abstract
The invention relates to a roasting method for aluminum electrolytic cell in aluminum electrolytic process, which is characterized in that flexible graphite material is used as heating element in the roasting process. The heating element has flexibility and elasticity thereby being able to well contact with carbon block and reduce contact resistance in order to prevent the cathode being oxidized. The method can reduce temperature difference on the whole cathode in order to realize uniform roasting for the electrolytic cell.
Description
Technical field
The present invention relates to the aluminum electrolyzing cell used roasting method in a kind of aluminium electrolysis process.
Background technology
Aluminium cell all will experience roasting after building by laying bricks or stones, start and start the management talent in later stage and carry out the transition to ordinary production.And one of effect of roasting is: discharge the moisture of masonry, oven dry groove liner makes in the burner hearth and sticks with paste the sintering coking around the carbon interblock and groove, make bottom temperature near or reach electrolysis ordinary production temperature.Aluminium industry to the basic demand of calcination is: (1) heats the charcoal negative electrode slowly, reaches service temperature (950-980 ℃), avoids producing thermal shocking in the charcoal negative electrode; (2) working face of uniform heating charcoal negative electrode makes the thermograde on surface as far as possible little, avoids surface heat stress; (3) guarantee that the bituminous cement in the charcoal paste carries out coking with suitable speed, so that obtain good adhesiveproperties.
Aluminium electrolytic cell cathode roasting success or not is directly connected to life-span of aluminium cell.The modern aluminum tank roasting method has three kinds at present: (1) fuel baking method; (2) molten aluminum roasting method; (3) baking coke particles method.
Wherein, the advantage of fuel baking method is: the cathode surface temperature is even, and the thermal stresses of generation is very little, and maturing temperature is easy to control, and cathode life is long.Shortcoming is that cathode block and charcoal are sewed with certain oxidization burning loss, and complicated operation during startup because anode is cold, is easy to take place anode effect, and is difficult for extinguishing; The molten aluminum roasting method is at first injected high temperature aluminum liquid in electrolyzer when roasting and starting, this can produce very big thermal shocking to the groove liner, and as being lined with crackle in the groove, aluminium liquid will enter the slit, can make cathode bottom produce the erosion hole after the startup.Baking coke particles method (being that present each station-service gets a kind of method at most); its charcoal cathode surface upper berth one coke charge grain or carbon dust under anode carbon block; and anode is seated on carbon granule and the carbon dust; galvanization carries out roasting then; adopt splitter during roasting; electric current in the groove is progressively increased, and temperature progressively is elevated to more than 900 ℃.Because the cathode inner lining temperature progressively is raised to more than 900 ℃ from envrionment temperature, therefore be unlikely to produce too big thermal shocking, molten aluminum roasting method analogue can not appear.But the main drawback of baking coke particles method is the distribution of current inequality, causes the cathode surface thermograde to increase, in the electrical roasting process, the local electric current that temperature is high is big, and the big local temperature of electric current can be higher, forms positive regeeration, thereby cause the temperature difference bigger, also be difficult for adjusting.Sometimes the temperature difference is up to several Baidu.
Summary of the invention
The present invention is directed to the deficiency of above-mentioned prior art, provide a kind of can well contact, reduce with the charcoal piece contact resistance, protection negative electrode not oxidated, reduce the uniform aluminum cell graphite blanket baking method of the temperature difference, roasting on the whole cathode plane.
The objective of the invention is to be achieved through the following technical solutions.
A kind of aluminum cell graphite blanket baking method is characterized in that roasting process is that heating element carries out roasting with the flexible graphite material.
A kind of aluminum cell graphite blanket baking method of the present invention is characterized in that described flexible graphite material is a soft graphite.
A kind of aluminum cell graphite blanket baking method of the present invention is characterized in that described flexible graphite material is the graphite blanket that soft graphite or flexible graphite paper are made.
A kind of aluminum cell graphite blanket baking method is characterized in that described is 2-20mm with flexible graphite material thickness.
A kind of aluminum cell graphite blanket baking method of the present invention, it is characterized in that described electric current can be from anode by flexible graphite material to negative electrode.
A kind of new calcination method of the present invention, calcination is layered on flexible graphite material on the whole electric tank cathode before starting, anode carbon block group is placed on the graphite blanket, rely on the deadweight realization of charcoal piece to be connected with the tight of graphite blanket, the thickness by the graphite blanket or the number of plies of graphite blanket are regulated the resistance of roasting heating element.
Among the present invention, the roasting heating element has certain flexibility and elasticity, can well contact with the charcoal piece, reduces contact resistance, and the protection negative electrode is not oxidated.Can reduce the temperature difference on the whole cathode plane, be beneficial to the even roasting of electrolyzer.
Graphite blanket among the present invention has very big anisotropic, perpendicular to bottom charcoal piece direction bigger resistance is being arranged, can satisfy the needs of heating, and it has less resistance in the horizontal direction, electrical and thermal conductivity is good, can reduce the temperature difference on the whole cathode plane, positive regeeration when reducing roasting is beneficial to the even roasting of electrolyzer, reduces rimose and takes place, it is stable that calcination is started, and increases cell life.
Embodiment
A kind of aluminum cell graphite blanket baking method, its roasting process are that heating element carries out roasting with soft graphite blanket material; Described flexible graphite material is the graphite blanket that soft graphite or flexible graphite paper process, and thickness is adjustable between 2-20mm, and resistivity is 5000-18000 μ Ω m.Roasting time 72-96 hour.
Embodiment 1
The graphite blanket that adopts flexible graphite material to be composited on 150KA level prebaked cell for aluminum-reduction carries out preheating and baking, the soft graphite blanket thickness of laying on electric tank cathode is 10mm, resistivity is 12000 μ Ω m, behind the energising 24h, removed a component flow in per 6 hours, behind the preheating and baking 72 hours, 900 ℃ of groove Wen Keda can smooth starting.
Embodiment 2
The graphite blanket that adopts flexible graphite paper to be composited on 150KA level prebaked cell for aluminum-reduction carries out preheating and baking, the soft graphite blanket thickness of laying on electric tank cathode is 6mm, resistivity is 8000 μ Ω m, behind the energising 24h, removed a component flow in per 6 hours, behind the preheating and baking 96 hours, 900 ℃ of groove Wen Keda can smooth starting.
Claims (4)
1. an aluminum cell graphite blanket baking method is characterized in that roasting process is that heating element carries out roasting with the flexible graphite material.
2. a kind of aluminum cell graphite blanket baking method according to claim 1 is characterized in that described flexible graphite material is a soft graphite.
3. a kind of aluminum cell graphite blanket baking method according to claim 1 is characterized in that described flexible graphite material is the graphite blanket that flexible graphite paper is made.
4. a kind of aluminum cell graphite blanket baking method according to claim 1 is characterized in that described is 2-20mm with flexible graphite material thickness.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101796526A CN101255565A (en) | 2007-12-17 | 2007-12-17 | aluminum cell graphite blanket baking method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101796526A CN101255565A (en) | 2007-12-17 | 2007-12-17 | aluminum cell graphite blanket baking method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101255565A true CN101255565A (en) | 2008-09-03 |
Family
ID=39890653
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2007101796526A Pending CN101255565A (en) | 2007-12-17 | 2007-12-17 | aluminum cell graphite blanket baking method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101255565A (en) |
-
2007
- 2007-12-17 CN CNA2007101796526A patent/CN101255565A/en active Pending
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Open date: 20080903 |