CN101709484B - Preheating starting method for inertia anode aluminum electrolyzer - Google Patents
Preheating starting method for inertia anode aluminum electrolyzer Download PDFInfo
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- CN101709484B CN101709484B CN2009102433834A CN200910243383A CN101709484B CN 101709484 B CN101709484 B CN 101709484B CN 2009102433834 A CN2009102433834 A CN 2009102433834A CN 200910243383 A CN200910243383 A CN 200910243383A CN 101709484 B CN101709484 B CN 101709484B
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- 238000000034 method Methods 0.000 title claims abstract description 46
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 27
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 18
- 239000003792 electrolyte Substances 0.000 claims abstract description 46
- 238000010438 heat treatment Methods 0.000 claims abstract description 36
- 239000007784 solid electrolyte Substances 0.000 claims abstract description 14
- 230000008569 process Effects 0.000 claims abstract description 10
- 238000004519 manufacturing process Methods 0.000 claims abstract description 6
- 239000004411 aluminium Substances 0.000 claims description 16
- 238000004939 coking Methods 0.000 claims description 11
- 239000011244 liquid electrolyte Substances 0.000 claims description 11
- 238000004088 simulation Methods 0.000 claims description 10
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 9
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical compound [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 claims description 9
- 238000005485 electric heating Methods 0.000 claims description 9
- 239000004615 ingredient Substances 0.000 claims description 9
- 239000003795 chemical substances by application Substances 0.000 claims description 7
- PUZPDOWCWNUUKD-UHFFFAOYSA-M sodium fluoride Chemical compound [F-].[Na+] PUZPDOWCWNUUKD-UHFFFAOYSA-M 0.000 claims description 7
- 239000011241 protective layer Substances 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 4
- 238000002844 melting Methods 0.000 claims description 4
- 230000008018 melting Effects 0.000 claims description 4
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 3
- 230000007797 corrosion Effects 0.000 claims description 3
- 238000005260 corrosion Methods 0.000 claims description 3
- 229910002804 graphite Inorganic materials 0.000 claims description 3
- 239000010439 graphite Substances 0.000 claims description 3
- 229910052582 BN Inorganic materials 0.000 claims description 2
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 claims description 2
- 229910052593 corundum Inorganic materials 0.000 claims description 2
- 239000010431 corundum Substances 0.000 claims description 2
- 229910052573 porcelain Inorganic materials 0.000 claims description 2
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims description 2
- 229910010271 silicon carbide Inorganic materials 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 2
- 125000001153 fluoro group Chemical class F* 0.000 abstract 1
- 238000005868 electrolysis reaction Methods 0.000 description 7
- 229910052799 carbon Inorganic materials 0.000 description 6
- 239000010410 layer Substances 0.000 description 5
- 238000003860 storage Methods 0.000 description 5
- 239000000571 coke Substances 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 239000000567 combustion gas Substances 0.000 description 3
- 239000003610 charcoal Substances 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 230000003245 working effect Effects 0.000 description 2
- QYEXBYZXHDUPRC-UHFFFAOYSA-N B#[Ti]#B Chemical group B#[Ti]#B QYEXBYZXHDUPRC-UHFFFAOYSA-N 0.000 description 1
- 229910033181 TiB2 Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001354 calcination Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000035800 maturation Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- -1 sodium aluminum fluoride Chemical compound 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Abstract
The invention relates to a preheating starting method for an inertia anode aluminum electrolyzer, which is characterized in that the preheating starting process orderly comprises the steps of: (1) laying a set of electrical heaters which has same number of electrodes on a hearth, (2) filling up solid electrolyte in the hearth, electrically heating till the solid electrolyte fused, and continuously adding solid electrolyte till the electrolyte level meets the production requirement, (3) lowering the power of the electrical heater after the electrolyte level meets the production requirement, and simulating the heat value of normal running electrolyzer, and (4) supplying fluorine salt, adjusting the component of electrolyte, establishing energy balance and thickness of furnace stack, exchanging a set of inertia anode and cathode when switching off a set of inner heating resistance after reaching energy balance, electrifying on full load after finishing exchange. The method of the invention can preheat inertia anode electrolyzer, provide a nice running condition to the inertia anode in order to promote the use effect and prolong the service life of the inertia anode.
Description
Technical field
The present invention relates to a kind of preheating starting method of suitable inert anode electrolyzer.
Background technology
Since the sodium aluminum fluoride of Hall-Heroult-alumina molten salt electrolysis method was come out, roasting and starting always was large-scale aluminum electrolytic cell or industrial aluminum electrolysis bath before bringing normally into operation, the very important process that institute must experience.The quality that calcination starts will directly affect the stably manufactured in electrobath start later stage, and every economic and technical norms and cell life.
Roasting and starting is extremely important to aluminium cell, and the method that is adopted of roasting and starting is just crucial more.For the large-sized prebaked cell for aluminum-reduction with up-down structure (anode is last, and negative electrode is following), roasting method commonly used has: baking coke particles, molten aluminum roasting, combustion gas roasting etc.These all are to study for a long period of time and industrialization practice, the traditional method of maturation and widespread use through people.
The method and the technological process of baking coke particles and combustion gas roasting have been introduced in patent 99120950.8 and the patent 00102562.7 respectively.Patent 200810226873.9 has been introduced a kind of baking start-up method of novel stream guidance type aluminum reduction cell, and its described electric tank cathode bottom has curb and Aluminum storage pond.The roasting method that adopts is the combination of baking coke particles and combustion gas roasting, or this baking coke particles a kind of improvement in conjunction with the electrolyzer own characteristic of saying so.
Although the form difference that these traditional methods adopted at the roasting initial stage has implied two common ground in the process of whole roasting and starting: the one, need anode to participate in.In roasting early stage or later stage, give anodal closure, come further molten electrolyte and set up energy balance by anode and electrolyzer self-heating; The 2nd, after the roasting and starting, all need progressively to set up energy balance and material balance by the long final-period management phase of for some time.During this period, often need the bath voltage that keeps higher, higher molecular ratio, higher electrolysis temperature, and because the needs of cleaning carbon slag, clean ionogen, regular burner hearth, anode effect takes place also more.The various factors of instability also can cause the inhomogeneous of distribution of current sometimes.Fluctuation of service not only during this period, and current efficiency is also lower.
Yet for inert anode aluminium cell, its inert anode and corresponding negative electrode, the use or do not having under the sfgd. of mostly can not in roasting electrolyzer process, directly switching on the electrolyzer roasting.And the inert anode disturbance rejection is poor, needs to move stably after startup and each operating parameter (comprising current density, electrolyte ingredient, electrolysis temperature etc.) balance and stability.Preferably when switching on, inert anode just can be operated among the environment of having set up energy balance.All be beneficial to result of use and the work-ing life to noble electrode like this.
In the patent documentation that can see at present, the roasting and starting of inert anode electrolyzer is continued to use traditional method mostly indirectly, particularly the roasting stage.
Described in the patent 200510031315.3, inert anode is taken up with tank body, tank body adopts graphite or carbon product, and the electrode after taking up is as carbon anode, can be in roasting and starting or use during change poles, and to avoid the impact of heat, electricity and thermal etching gas.Energising back tank body can consume, and when exposing noble electrode, electrode carries out the transition to working order naturally.
Described in the patent 01820302.7, several noble electrodes are combined, and added insulating heat insulating material, form and the carbon anode similar shape.Every group of noble electrode combination can be replaced the carbon anode more than one or that has now in the groove.Reveal in its literary composition earlier with carbon anode roasting and starting electrolyzer, treat that electrolyzer is stable after, replace with the inert anode group again.
US 6,537, described in 438, when the pipeline start up by preheating electrolyzer, with the outer stopping off of negative electrode.Innermost layer contact charcoal negative electrode is titanium diboride layer in the protective layer, and the middle layer is metallic aluminium or alloy, and outermost layer is a charcoal.Adopt the method for gas roast, anode is the sintering metal anode.The oxygenizement that the anodic protective layer derives from the roasting process makes its top layer oxidation.
From these patents, find out, at present, all taking certain measure, and purpose only is to make the traditional roasting method of employing that it can be indirect, and do not have too many consideration for start-up course to the roasting and starting of inertia electrolyzer.
Can set up thermal equilibrium after the noble electrode energising operation, need great pole span just can set up thermal equilibrium, whether electrolyzer needs to take insulation or cooling measure etc., and these problems all can only be after the noble electrode energising, and constantly adjustment just can be known and be resolved.That is to say still and inevitably will pass through so-called " final-period management phase ".Prior art is not directly considered the pipeline start up by preheating success or not.And these adjustment processes are to very unfavorable of noble electrode operation.
This shows,, still need a kind of new preheating starting method for the inert anode electrolyzer.This method not only can heat and roaster hearth, can also help electrolyzer to set up energy balance and stove group in advance.Promptly may operate in the stable environment after making electrifying electrodes.
Summary of the invention
Purpose of the present invention is exactly the deficiency at above-mentioned prior art, and a kind of effectively preheating burner hearth, molten electrolyte are provided, and can also just set up the inert anode aluminium cell preheating starting method of type in thermal equilibrium and the good burner hearth on inert anode before the groove.
The objective of the invention is to be achieved through the following technical solutions.
A kind of preheating starting method of inert anode electrolyzer is characterized in that the steps in sequence of its pipeline start up by preheating process comprises:
(1) in burner hearth, lays and the corresponding to an electric heating element group of electrode group number;
(2) fill solid electrolyte in the burner hearth, energising is heated to electrolyte melting; And constantly add solid electrolyte, reach production requirement until electrolyte level;
(3) after electrolyte level reaches production requirement, reduce the power of an electric heating element, the thermal value when the simulation electrolyzer normally moves;
(4) replenish villiaumite, adjust electrolyte ingredient; Set up energy balance and stove group thickness; After energy balance was stable, one group of internal heating resistance of every disconnection changed one group of inert anode and negative electrode, finishes until replacement; Carry out the full load energising.
The preheating starting method of a kind of inert anode electrolyzer of the present invention is characterized in that its step (2) is to fill solid electrolyte in the burner hearth, is heated to electrolyte melting by the roasting curve of setting; And pour into liquid electrolyte and make electrolyte level reach desired height.
The preheating starting method of a kind of inert anode electrolyzer of the present invention is characterized in that its step (2) for not adorning ionogen in the burner hearth, by the roasting curve heating furnace of setting caking agent coking to the burner hearth; And pour into liquid electrolyte and make electrolyte level reach desired height.
The preheating starting method of a kind of inert anode electrolyzer of the present invention can pour into a certain amount of aluminium water before starting, and also can not irritate aluminium water;
The preheating starting method of a kind of inert anode electrolyzer of the present invention; the an electric heating element that it is characterized in that its an electric heating element group is a heating resistor; there is the corrosion resistant material protective layer on the heating resistor surface, and supercoat can be selected a kind of of corundum, alumina porcelain, silicon carbide, graphite, boron nitride for use.
The preheating starting method of a kind of inert anode electrolyzer of the present invention, the resistance of use an electric heating element, at first preheating burner hearth, molten electrolyte can be simulated the thermal value of electrolyzer normal operating condition then, set up type in thermal equilibrium and the burner hearth, replace electrode at last one by one.This method is applicable to that the vertical structure electrolyzer also is applicable to the electrolyzer of up-down structure.The present invention can provide good operational conditions for inert anode, thereby improves the result of use and the work-ing life of inert anode.
Embodiment
A kind of preheating starting method of inert anode electrolyzer, this method not only comprises the preheating and baking burner hearth, comprises that also auxiliary electrolytic cell is set up energy balance in advance and stove is helped.This method can make inert anode and its negative electrode can be operated in after energising in the metastable environment, avoids experiencing unsettled " final-period management phase ";
A kind of preheating starting method of inert anode electrolyzer by lay the method for many group internal heating resistance in burner hearth, heats or baking furnace; Utilize self heat fused ionogen or pour into liquid electrolyte or method that both combine, make electrolyte level reach desired height; Utilize this internal heating resistance then, the thermal value when the simulation electrolyzer normally moves is set up type in energy balance and the burner hearth for electrolyzer in advance; Replace electrode, also energising startup at last; After treating that perhaps electrolyte temperature reaches target temperature, single immediately group is progressively replaced electrode, and electrolyte temperature reduces in the time of the electrode preheating, and when temperature is reduced to electrolysis when temperature required, i.e. energising starts.Energising can pour into a certain amount of aluminium water before starting, and also can not irritate; Whole pipeline start up by preheating process is divided into five stages: one, formulate temperature increasing schedule, heating, baking furnace make the caking agent coking; Two, molten electrolyte or pour into liquid electrolyte to desired height; Thermal value when three, the simulation electrolyzer normally moves when setting up energy balance, can also be adjusted electrolyte ingredient; Four, single group is progressively dismantled internal heating resistance, replaces electrode; Five, treat the abundant preheating of electrode after, grouping energising is replaced electrode until whole internal heating resistance and to be finished, and realizes energising at full capacity;
Below in conjunction with embodiment, describe the present invention in detail:
Embodiment 1
Burner hearth is laid 16 groups of internal heating resistance, and logical direct current is filled solid electrolyte in the burner hearth, heated about 14 hours, and electrolyte temperature is 700 ℃ in the burner hearth.Constantly adding solid electrolyte, is 32cm until electrolyte level.Then, reduce the internal heating resistor power, the thermal value of electrolyzer when simulation normally moves.Replenish villiaumite simultaneously, adjust electrolyte ingredient.Set up energy balance after 48 hours, the thickness 8cm of stove group.After energy balance was stable, one group of internal heating resistance of every disconnection changed one group of inert anode and negative electrode (vertical electrolyzer), finishes until replacement.After the abundant preheating of electrode, the electrolyzer energising starts, and starts steadily, and normal running voltage is 3.66V.
Embodiment 2
Burner hearth is laid 16 groups of internal heating resistance, and indirect current is filled solid electrolyte in the burner hearth, heats up according to temperature increasing schedule, and electrolyte temperature is 750 ℃ in the final burner hearth.Constantly adding solid electrolyte, is 32cm until electrolyte level.Then, reduce the internal heating resistor power, the thermal value of electrolyzer when simulation normally moves.Replenish villiaumite simultaneously, adjust electrolyte ingredient.Set up energy balance after 48 hours, the thickness 7.8cm of stove group.After energy balance was stable, one group of internal heating resistance of every disconnection changed one group of inert anode and negative electrode (vertical electrolyzer), finishes until replacement.After the abundant preheating of electrode, the electrolyzer energising starts, and starts steadily, and normal running voltage is 3.63V.
Embodiment 3
Burner hearth is laid 16 groups of internal heating resistance, and indirect current is filled solid electrolyte in the burner hearth, reach 650 ℃ of temperature in the burner hearth after.Irritating the good liquid electrolyte of fusing, is 32cm until electrolyte level.Continuing to be heated to electrolyte temperature is 750 ℃.Then, reduce the internal heating resistor power, the thermal value of electrolyzer when simulation normally moves.Replenish villiaumite simultaneously, adjust electrolyte ingredient.Set up energy balance after 48 hours, the thinnest part thickness 6.2cm of stove group.After energy balance was stable, one group of internal heating resistance of every disconnection changed one group of inert anode (up-down structure electrolyzer), finishes until replacement.After the abundant preheating of electrode, the electrolyzer energising starts, and starts steadily, and normal running voltage is 5.65V.
Embodiment 4
Burner hearth is laid 12 groups of internal heating resistance, and indirect current is not adorned ionogen in the burner hearth, heat up according to temperature increasing schedule.Purpose is a baking furnace, and makes the caking agent coking.After treating that coking finishes, irritating the good liquid electrolyte of fusing, is 32cm until electrolyte level.Continuing to be heated to electrolyte temperature is 750 ℃.Then, reduce the internal heating resistor power, the thermal value of electrolyzer when simulation normally moves.Replenish villiaumite simultaneously, adjust electrolyte ingredient.Set up energy balance after 48 hours, the thinnest part thickness 6.2cm of stove group.After energy balance was stable, one group of internal heating resistance of every disconnection changed one group of inert anode and negative electrode (vertical electrolyzer), finishes until replacement.After the abundant preheating of electrode, the electrolyzer energising starts, and starts steadily, and normal running voltage is 3.67V.
Embodiment 5
The drainage type electrolytic cell in band Aluminum storage pond, burner hearth is laid 12 groups of internal heating resistance, and 4 groups in Aluminum storage pond amounts to 16 groups.Indirect current is not adorned ionogen in the burner hearth, heat up according to temperature increasing schedule.Purpose is a baking furnace, and makes the caking agent coking.After treating that coking finishes, irritating the good liquid electrolyte of fusing, is 32cm until electrolyte level.Continuing to be heated to electrolyte temperature is 750 ℃.Then, reduce the internal heating resistor power, the thermal value of electrolyzer when simulation normally moves.Replenish villiaumite simultaneously, adjust electrolyte ingredient.Set up energy balance after 48 hours, the thinnest part thickness 6.2cm of stove group.After energy balance was stable, one group of internal heating resistance of every disconnection changed one group of inert anode and negative electrode (vertical electrolyzer), finishes until replacement.After the abundant preheating of electrode, the electrolyzer energising starts, and starts steadily, and normal running voltage is 3.69V.
Embodiment 6
The drainage type electrolytic cell in band Aluminum storage pond, burner hearth is laid 12 groups of internal heating resistance, and 4 groups in Aluminum storage pond amounts to 16 groups.Indirect current is not adorned ionogen in the burner hearth, heat up according to temperature increasing schedule.Purpose is a baking furnace, and makes the caking agent coking.After treating that coking finishes, irritating the good liquid electrolyte of fusing, is 31cm until electrolyte level.Continuing to be heated to electrolyte temperature is 750 ℃, pours into aluminium liquid 2cm again.Then, reduce the internal heating resistor power, the thermal value of electrolyzer when simulation normally moves.Set up energy balance after 48 hours, the thinnest part thickness 6cm of stove group.After energy balance was stable, one group of internal heating resistance of every disconnection changed one group of inert anode and negative electrode (vertical electrolyzer), finishes until replacement.After the abundant preheating of electrode, the electrolyzer energising starts, and starts steadily, and normal running voltage is 3.68V.
Embodiment 7
Burner hearth is laid 12 groups of internal heating resistance, and indirect current is not adorned ionogen in the burner hearth, heat up according to temperature increasing schedule.Purpose is a baking furnace, and makes the caking agent coking.After treating that coking finishes, irritating the good liquid electrolyte of fusing, is 32cm until electrolyte level.Continuing to be heated to electrolyte temperature is 750 ℃.Then, replace electrode immediately, when treating that electrolyte temperature is cooled to 720 ℃, the energising electrolysis.Final electrolyzer self has been set up thermal equilibrium, about 710 ℃ of electrolysis temperatures, the thinnest part thickness 6cm of stove group.After energy balance was stable, one group of internal heating resistance of every disconnection changed one group of inert anode (up-down structure electrolyzer), finishes until replacement.After the abundant preheating of electrode, the electrolyzer energising starts, and starts steadily, and normal running voltage is 5.7V.
Claims (5)
1. the preheating starting method of an inert anode aluminium cell is characterized in that the steps in sequence of its pipeline start up by preheating process comprises:
(1) in burner hearth, lays and the corresponding to an electric heating element group of electrode group number;
(2) fill solid electrolyte in the burner hearth, energising is heated to electrolyte melting; And constantly add solid electrolyte, reach production requirement until electrolyte level;
(3) after electrolyte level reaches production requirement, reduce the power of an electric heating element, the thermal value when the simulation electrolyzer normally moves;
(4) replenish villiaumite, adjust electrolyte ingredient; Set up energy balance and stove group thickness; After energy balance was stable, one group of internal heating resistance of every disconnection changed one group of inert anode and negative electrode, finishes until replacement; Carry out the full load energising.
2. the preheating starting method of a kind of inert anode aluminium cell according to claim 1 is characterized in that energising pours into aluminium water or do not irritate aluminium water before starting in electrolyzer.
3. the preheating starting method of a kind of inert anode aluminium cell according to claim 1; the an electric heating element that it is characterized in that its an electric heating element group is a heating resistor; there is the corrosion resistant material protective layer on the heating resistor surface, and the corrosion resistant material protective layer is select corundum, alumina porcelain, silicon carbide, graphite, boron nitride for use a kind of.
4. the preheating starting method of a kind of inert anode aluminium cell according to claim 1 is characterized in that its step (2) is to fill solid electrolyte in the burner hearth, is heated to electrolyte melting by the roasting curve of setting; And pour into liquid electrolyte and make electrolyte level reach desired height.
5. the preheating starting method of a kind of inert anode aluminium cell according to claim 1 is characterized in that its step (2) do not adorn ionogen in the burner hearth, by the roasting curve heating furnace of setting caking agent coking to the burner hearth; And pour into liquid electrolyte and make electrolyte level reach desired height.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102230197B (en) * | 2011-06-29 | 2012-11-21 | 遵宝钛业有限公司 | Starting method of magnesium electrolytic cell |
| CN102234819B (en) * | 2011-08-04 | 2013-02-13 | 中国铝业股份有限公司 | Preheating starting method for aluminium electrolysis cell |
| CN102808196B (en) * | 2012-07-27 | 2014-10-22 | 中国铝业股份有限公司 | Direct-current shunt preheating start method for inert electrode aluminum electrolysis cell |
| CN103352236A (en) * | 2013-06-25 | 2013-10-16 | 中国铝业股份有限公司 | Method for rapidly building new-started electrolytic tank furnace |
| CN103834966A (en) * | 2013-11-28 | 2014-06-04 | 云南云铝润鑫铝业有限公司 | Electrolytic tank calcination method using aluminum skimming and aluminum powder |
| CN110042427B (en) * | 2019-04-28 | 2020-09-22 | 镇江慧诚新材料科技有限公司 | Preheating starting method for vertical electrode aluminum electrolytic cell |
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