CN101187040A - Method for stabilizing aluminum cell hearth - Google Patents
Method for stabilizing aluminum cell hearth Download PDFInfo
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- CN101187040A CN101187040A CNA2007101217167A CN200710121716A CN101187040A CN 101187040 A CN101187040 A CN 101187040A CN A2007101217167 A CNA2007101217167 A CN A2007101217167A CN 200710121716 A CN200710121716 A CN 200710121716A CN 101187040 A CN101187040 A CN 101187040A
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- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 55
- 238000000034 method Methods 0.000 title claims abstract description 30
- 230000000087 stabilizing effect Effects 0.000 title claims abstract description 10
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical compound [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 title claims description 13
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 42
- 239000003792 electrolyte Substances 0.000 claims abstract description 20
- 239000004411 aluminium Substances 0.000 claims description 37
- 238000012423 maintenance Methods 0.000 claims description 8
- 239000007788 liquid Substances 0.000 claims description 6
- -1 sodium aluminum fluoride Chemical compound 0.000 claims description 6
- 238000002347 injection Methods 0.000 claims description 3
- 239000007924 injection Substances 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 9
- 238000003723 Smelting Methods 0.000 abstract 1
- 238000005265 energy consumption Methods 0.000 abstract 1
- 239000007787 solid Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000001354 calcination Methods 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000005868 electrolysis reaction Methods 0.000 description 2
- 238000009866 aluminium metallurgy Methods 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 239000003610 charcoal Substances 0.000 description 1
- 229910052593 corundum Inorganic materials 0.000 description 1
- 239000010431 corundum Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005188 flotation Methods 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000011112 process operation Methods 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
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- Electrolytic Production Of Metals (AREA)
Abstract
Provided is a method for stabilizing the furnace tank of an aluminum reduction cell, which relates to a method of stabilizing the furnace tank of the aluminum reduction cell in the process of aluminum smelting in the aluminum reduction cell. The invention is characterized in that the method includes the following steps, (1) molecule control should drop slowly from high to low, (2) electric voltage should drop from fast to slow, (3) electrolyte should be abundant and the level of aluminum should be low before high, (4) the temperature of the electrolyte should smoothly drop from high to low. Utilizing the method of the invention, the formed furnace tank is characterized by strong stability, which is not easy to be molten. The formed furnace tank is very structured, which meets the need of the product of the modern aluminum reduction cell, strengthens the ability of self-balance of the aluminum reduction cell and realizes the objects of high current efficiency and low electrical energy consumption production.
Description
Technical field
A kind of method of stabilizing aluminum cell hearth relates to the method for stabilizing aluminum cell hearth in a kind of aluminium cell aluminium metallurgy process.
Background technology
In the Aluminium Electrolysis process, the burner hearth of pre-calcining electrolytic cell is meant in electrolytic process and is depositing by corundum (α-Al on the side wall carbon block inwall and charcoal piece surface, bottom
2O
3) and the crust formed of sodium aluminum fluoride form oval-shaped ring-type rule space.It is distributed in around the anodic, and the crust of formation requires to have suitable thickness and hardness, and uniformity everywhere, stretch one's legs and want rule in the bottom of ring texture, length is suitable, promptly can not longly reach below the anode, can not too shortly not stretch one's legs again, cause negative electrode aluminium liquid minute surface excessive.Ideal is stretched one's legs and is, it surrounds the remaining bottom land (negative electrode aluminium liquid minute surface) in back is the rectangle of rule, and area is slightly larger than the anodic frontal projected area.
The foundation of tradition burner hearth is taked two kinds of methods usually with maintenance: first kind is that artificial secondary process and technical qualification are adjusted combined techniques; Second kind is that the major technique condition is adjusted method, the burner hearth that these two kinds of methods are set up in the production run process of reality is very unstable, heat-resisting variation poor-performing, the lopsided burner hearth that irregular " sky suitable for reading stretch one's legs length " often occur, cause the electrolyzer swing comparatively frequent, sometimes side wall carbon block occurs and changed the phenomenon of red pot shell runout, dailyly manually have to take the secondary process operation to come sectional repair burner hearth stably manufactured, increased simultaneously the alumina concentration difficulty of control automatically again in processing, the precipitation crust appears in furnace bottom, formed the more burner hearth of irregularity, electrolyzer does not have stronger self-balancing ability all the time, is restricting the optimization of electrolyzer index to a certain extent.
Summary of the invention
The purpose of invention is the deficiency that exists at above-mentioned prior art, provide a kind of and can and keep solid firm regular burner hearth for the aluminium cell structure, in the actual production operation, further strengthen its self-balancing ability, prolong cell life, and make aluminium cell be in the method for the stabilizing aluminum cell hearth in the steady efficient low-consume production model for a long time.
The objective of the invention is to be achieved through the following technical solutions.
A kind of method of stabilizing aluminum cell hearth is characterized in that its method comprises the following steps:
(1) control molecular ratio: start back first month molecular ratio and remain on 2.9～3.0, molecular ratio remained on 2.8～2.9 in second month, and the 3rd a month molecular ratio remains on 2.6～2.8, progressively adjusts to normal molecular after three months than 2.35～2.55;
(2) control voltage: electrobath start initial stage control voltage is 9～11V, all melt to sodium aluminum fluoride, is increased in after voltage is reduced to 6.0～6.5V behind the product aluminium by injection aluminium liquid, and at 1～90 day, reduction voltage was to normal value 4.11～4.16V;
(3) control ionogen: starting interior maintenance in January electrolyte level is 27～29cm, keeping electrolyte level in the second month is 25～27cm, keeping electrolyte level in three month is 22～24cm, and the 4th month begins to remain to normal electrolyte level is 18～22cm;
(4) control aluminium level: start back three days, with aluminium horizontal adjustment to 17 ± 2cm, the aluminium level keeps by 18 ± 2cm in later January, and the aluminium level keeps by 19 ± 2cm in later again the second month, three month later again aluminium level keeps by 20 ± 2cm, and later aluminium level is controlled to be 22 ± 2cm;
(5) control electrolyte temperature: starting back 10 days inner control ionogen temperature is 975～980 ℃, and control ionogen temperature was 965～970 ℃ in 10～30 days, and second month begins with 5 ℃/10 days speed until dropping to normal 920～950 ℃.
Method of the present invention is set up and is kept solid firm regular burner hearth by optimizing the every production specifications of coupling aluminium cell fully.Particular content is: every production specifications progressively will be optimized coupling in three months behind electrobath start and be controlled well (molecular ratio wants that high earlier back is low to fall slowly, loss of voltage will be first quick and back slow, ionogen is wanted abundance, and it is high that the aluminium level will be hanged down the back earlier, and electrolyte temperature is low steady reduction the in height back earlier); Make electrolysis of aluminum keep stable material and heat balance, set up firm solid burner hearth gradually.
Adopt method of the present invention, cooperate and strengthen the electrolytic cell operation maintenance management, comprising: the anode quality is changed in (1) raising.Before changing anode the old shell of boiler face upper surface is scratched, required the face-piece piece to drag for totally when changing anode, the breeze of surface flotation drags for thoroughly, and the anode mounting height is accurate, shortens and changes the anode time, in time seals insulation material, reduces the thermosteresis of electrolyzer as far as possible; (2) reinforcement is to the management of aluminium amount.Stablize the aluminium amount by the accuracy that improves multimetering aluminium level, assigns aluminium task and actual aluminum yield; (3) reinfocing effect management reduces the generation of burst effect, reduces the influence degree to burner hearth, can produce the ideal effect.
Adopt method of the present invention, the burner hearth of formation has stronger thermostability, is not easy to melt; The burner hearth that forms is very regular, reaches modern aluminum tank production demand; Strengthen the self-balancing ability of aluminium cell, realized high current efficiency and low power consumption productive target.
Embodiment
A kind of method of stabilizing aluminum cell hearth, its method comprises the following steps:
(1) hangs down after molecular ratio wants elder generation high and fall slowly.Start back first month molecular ratio and remain on 2.9～3.0, molecular ratio remained on 2.8～2.9 in second month, and the 3rd a month molecular ratio remains on 2.6～2.8, progressively adjusts to normal molecular after three months than 2.35～2.55.
2, loss of voltage will be first quick and back slow.The electrobath start initial stage need be melted a large amount of sodium aluminum fluoride (4～5 tons), and to set up the thermal equilibrium heat demand relative big with surrounding environment, starts back voltage and will keep higher, generally remains on about 10 volts.Treat that sodium aluminum fluoride has all melted, by inject aluminium liquid be increased in produce aluminium after voltage reduce to 6.0～6.5 volts, after, maintenance mode first quick and back slow reduced voltage gradually to 4.11～4.16 volts of normal values in 90 days.
3, ionogen wants sufficient.Progressively set up solid regular burner hearth and the thermally equilibrated needs of electrolyzer ordinary production in order to guarantee electrolyzer, in the groove enough amount of electrolyte to be arranged, later carrying out along with electrolyzer production, the raising gradually of aluminium level, electrolyte level is reduced to normally gradually, specifically adjusts as follows: start 27～29cm maintenance in January, 25～27cm keeps in second month, three month 22～24cm began to remain to normal electrolyte level 18～22cm on the 4th month.
4, it is high that the aluminium level will be hanged down the back earlier.Start back three days, aluminium horizontal adjustment to 17 ± 2cm is pressed 18 ± 2cm and is kept in January, keep by 19 ± 2cm in second month, progressively reaches 22 ± 2cm by 20 ± 2cm maintenance after three months on the 3rd month.
5, electrolyte temperature is wanted the low steadily reduction in the high back of elder generation.Start in back 10 days and be not higher than 975～980 ℃, reduce to 965～970 ℃ in 10～30 days, beginning in second month with 5 ℃/10 days speed until dropping to normal 920～950 ℃.
Embodiment
Certain 85kA pre-calcining electrolytic cell starts back first month molecular ratio and remains on 2.9～3.0, and molecular ratio remained on 2.8～2.9 in second month, and the 3rd a month molecular ratio remains on 2.6～2.8, progressively adjusts to normal molecular after three months than 2.35～2.55.
Electrobath start initial stage control voltage is 9～11V, all melt to sodium aluminum fluoride, is increased in after voltage is reduced to 6.0～6.5V behind the product aluminium by injection aluminium liquid, and at 1～90 day, reduction voltage was to normal value 4.11～4.16V
Start that electrolyte level 27～29cm keeps in January, 25～27cm keeps in second month, and the 3rd month 22～24cm began to remain to normal electrolyte level 18～22cm on the 4th month.
Start back three days, aluminium horizontal adjustment to 17 ± 2cm is pressed 18 ± 2cm and is kept in January, keep by 19 ± 2cm in second month, progressively reaches 22 ± 2cm by 20 ± 2cm maintenance after three months on the 3rd month.
Start that electrolyte temperature is 975～980 ℃ in the back 1～10 day, reduce to 965～970 ℃ in 10～30 days, beginning in second month with 5 ℃/10 days speed until dropping to normal 920～950 ℃.
Adopt aforesaid method, strengthen the stability of electrolyzer, improve current efficiency 0.5%, direct current consumption reduces 200kwh/t.Al.
Claims (1)
1. the method for a stabilizing aluminum cell hearth is characterized in that its method comprises the following steps:
(1) control molecular ratio: start back first month molecular ratio and remain on 2.9～3.0, molecular ratio remained on 2.8～2.9 in second month, and the 3rd a month molecular ratio remains on 2.6～2.8, progressively adjusts to normal molecular after three months than 2.35～2.55;
(2) control voltage: electrobath start initial stage control voltage is 9～11V, all melt to sodium aluminum fluoride, is increased in after voltage is reduced to 6.0～6.5V behind the product aluminium by injection aluminium liquid, and at 1～90 day, reduction voltage was to normal value 4.11～4.16V;
(3) control ionogen: starting interior maintenance in January electrolyte level is 27～29cm, keeping electrolyte level in the second month is 25～27cm, keeping electrolyte level in three month is 22～24cm, and the 4th month begins to remain to normal electrolyte level is 18～22cm;
(4) control aluminium level: start back three days, with aluminium horizontal adjustment to 17 ± 2cm, the aluminium level keeps by 18 ± 2cm in later January, and the aluminium level keeps by 19 ± 2cm in later again the second month, three month later again aluminium level keeps by 20 ± 2cm, and later aluminium level is controlled to be 22 ± 2cm;
(5) control electrolyte temperature: starting back 10 days inner control ionogen temperature is 975～980 ℃, and control ionogen temperature was 965～970 ℃ in 10～30 days, and second month begins with 5 ℃/10 days speed until dropping to normal 920～950 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007101217167A CN101187040B (en) | 2007-09-13 | 2007-09-13 | Method for stabilizing aluminum cell hearth |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007101217167A CN101187040B (en) | 2007-09-13 | 2007-09-13 | Method for stabilizing aluminum cell hearth |
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| Publication Number | Publication Date |
|---|---|
| CN101187040A true CN101187040A (en) | 2008-05-28 |
| CN101187040B CN101187040B (en) | 2010-06-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2007101217167A Expired - Fee Related CN101187040B (en) | 2007-09-13 | 2007-09-13 | Method for stabilizing aluminum cell hearth |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103031572A (en) * | 2011-09-30 | 2013-04-10 | 湖南创元铝业有限公司 | Method for building small hearths of aluminum electrolysis cells |
| CN103060848A (en) * | 2012-12-19 | 2013-04-24 | 中南大学 | Aluminum electrolytic tank with artificial hearth |
| CN103184475A (en) * | 2011-12-31 | 2013-07-03 | 湖南晟通科技集团有限公司 | Control method for clearing up furnace hearth of aluminum 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 |
| CN104711639A (en) * | 2013-12-16 | 2015-06-17 | 湖南创元铝业有限公司 | Method for diagnosis of damage of aluminum electrolytic tank |
| CN105239103A (en) * | 2015-11-23 | 2016-01-13 | 林州市林丰铝电有限责任公司 | Method for reducing precipitation capacity in hearth of 400 KA electrolytic bath |
| CN110541176A (en) * | 2019-09-29 | 2019-12-06 | 山西中铝华润有限公司 | aluminum electrolytic cell production process control method |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NO150007C (en) * | 1982-03-05 | 1984-08-01 | Sintef | RANGE LAYOUT FOR ALUMINUM ELECTRIC OVENERS. |
| CN100532652C (en) * | 2006-04-28 | 2009-08-26 | 中国铝业股份有限公司 | Preparation method of aluminum electrobath for transitting to electrolysis in low temperature |
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2007
- 2007-09-13 CN CN2007101217167A patent/CN101187040B/en not_active Expired - Fee Related
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103031572A (en) * | 2011-09-30 | 2013-04-10 | 湖南创元铝业有限公司 | Method for building small hearths of aluminum electrolysis cells |
| CN103031572B (en) * | 2011-09-30 | 2016-02-17 | 湖南创元铝业有限公司 | A kind of method setting up aluminium cell small hearth |
| CN103184475A (en) * | 2011-12-31 | 2013-07-03 | 湖南晟通科技集团有限公司 | Control method for clearing up furnace hearth of aluminum cell |
| CN103184475B (en) * | 2011-12-31 | 2016-09-28 | 晟通科技集团有限公司 | A kind of control method of the regular burner hearth of aluminium cell |
| CN103060848A (en) * | 2012-12-19 | 2013-04-24 | 中南大学 | Aluminum electrolytic tank with artificial hearth |
| CN103060848B (en) * | 2012-12-19 | 2015-02-18 | 中南大学 | Aluminum electrolytic tank with artificial hearth |
| 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 |
| CN104711639A (en) * | 2013-12-16 | 2015-06-17 | 湖南创元铝业有限公司 | Method for diagnosis of damage of aluminum electrolytic tank |
| CN104711639B (en) * | 2013-12-16 | 2017-02-15 | 湖南创元铝业有限公司 | Method for diagnosis of damage of aluminum electrolytic tank |
| CN105239103A (en) * | 2015-11-23 | 2016-01-13 | 林州市林丰铝电有限责任公司 | Method for reducing precipitation capacity in hearth of 400 KA electrolytic bath |
| CN110541176A (en) * | 2019-09-29 | 2019-12-06 | 山西中铝华润有限公司 | aluminum electrolytic cell production process control method |
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| Publication number | Publication date |
|---|---|
| CN101187040B (en) | 2010-06-09 |
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