CN1557995A - Energy-saving method for preparing electrolytic aluminium by reducing bath voltage - Google Patents
Energy-saving method for preparing electrolytic aluminium by reducing bath voltage Download PDFInfo
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- CN1557995A CN1557995A CNA2004100234458A CN200410023445A CN1557995A CN 1557995 A CN1557995 A CN 1557995A CN A2004100234458 A CNA2004100234458 A CN A2004100234458A CN 200410023445 A CN200410023445 A CN 200410023445A CN 1557995 A CN1557995 A CN 1557995A
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- electrolytic
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- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 23
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 23
- 238000000034 method Methods 0.000 title claims abstract description 21
- 239000004411 aluminium Substances 0.000 title claims description 13
- 238000005516 engineering process Methods 0.000 claims abstract description 11
- 238000005868 electrolysis reaction Methods 0.000 claims description 13
- 238000004519 manufacturing process Methods 0.000 claims description 9
- 229910004261 CaF 2 Inorganic materials 0.000 claims description 8
- 230000007704 transition Effects 0.000 claims description 7
- 210000000038 chest Anatomy 0.000 claims description 4
- 238000004134 energy conservation Methods 0.000 claims description 4
- 239000007788 liquid Substances 0.000 claims description 4
- 230000002787 reinforcement Effects 0.000 claims description 4
- 238000010517 secondary reaction Methods 0.000 claims description 4
- 229910016569 AlF 3 Inorganic materials 0.000 claims description 3
- 230000006911 nucleation Effects 0.000 claims description 3
- 238000010899 nucleation Methods 0.000 claims description 3
- 229920000642 polymer Polymers 0.000 claims description 3
- 230000002269 spontaneous effect Effects 0.000 claims description 3
- 239000003792 electrolyte Substances 0.000 abstract description 8
- 230000003014 reinforcing effect Effects 0.000 abstract 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- KLZUFWVZNOTSEM-UHFFFAOYSA-K Aluminium flouride Chemical compound F[Al](F)F KLZUFWVZNOTSEM-UHFFFAOYSA-K 0.000 description 1
- 101100004392 Arabidopsis thaliana BHLH147 gene Proteins 0.000 description 1
- 206010003694 Atrophy Diseases 0.000 description 1
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical class OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 1
- DNEHKUCSURWDGO-UHFFFAOYSA-N aluminum sodium Chemical compound [Na].[Al] DNEHKUCSURWDGO-UHFFFAOYSA-N 0.000 description 1
- 230000037444 atrophy Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000003203 everyday effect Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000002969 morbid Effects 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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- Electrolytic Production Of Metals (AREA)
Abstract
The present invention features that the electrolytic aluminum producing process has lowered electrolytic bath work voltage obtained through voltage balance regulation, new electrolyte comprising component an and component B, and serial current reinforcing technology to result in electrolyte overheat degree for the electrolytic bath working under relatively low voltage. By means of the said technological measures, the present invention reaches the aims of lowering electrolytic bath voltage, lowering electrolytic temperature, high current efficiency and lower power consumption.
Description
Technical field
The present invention relates to electrolytic aluminum energy-saving technique technical field.
Background technology
At present, the large scale electrolytic cell of domestic aluminum electrolysis industry generally adopts the production technique of " four low height ", i.e. the traditional operation technology of low alumina concentration, lower molecular ratio, low electrolysis temperature, low anode effect coefficient, high bath voltage (being high pole span).The open defect of its existence is that ton aluminium direct current consumption is higher, and ton aluminium cost is subjected to tremendous influence.If too much reduction bath voltage then is subjected to the influence of traditional ionogen composition, the thermal equilibrium of electrolyzer will be damaged, so can't form shape in the regular good groove thorax, though direct current consumption has reduced, the current efficiency of electrolyzer will reduce thereupon significantly, and its every index then obviously reduces.Moreover in sodium aluminum fluoride-alumina molten salt electrolysis method, the ionogen composition mainly refers to molecular ratio (NaF/ALF
3Mol ratio), MgF
2, CaF
2, MgF wherein
2, CaF
2Its significant feature reduces electrolyte primary crystal temperature (being Tc), molecular ratio (NaF/ALF exactly
3Mol ratio) ratio has determined the height of liquidus temperature, and the height of temperature has further influenced the maintenance of high current efficiency.The molecular ratio height causes the electrolyte temperature height; Molecular ratio is low, causes electrolyte temperature low.The production technique of tradition " four low height " mainly is under higher electric tank working voltage, adjusts the ionogen composition, formed a kind of ionogen composition of lower molecular ratio, thereby reach the purpose of low-temperature electrolytic under the high-voltage, raising current efficiency, still, ton aluminium power consumption is higher.
Summary of the invention
The purpose of this invention is to provide a kind of by reducing the energy-conservation method for electrolyzing aluminum of bath voltage realization, it is transformed on the basis of known electrolytic aluminium production technique, it can reduce bath voltage under the prerequisite of high molecule ratio, by reasonable adjustment ionogen composition, form electrolyzer under subnormal voltage operation, the ionogen composition of lower molecular ratio, thereby reach the purpose of low bath voltage, low electrolysis temperature, high current efficiency, low ton aluminium power consumption.
The objective of the invention is to be achieved through the following technical solutions: realize energy-conservation method for electrolyzing aluminum by reducing bath voltage, at first reduce the operating voltage of electrolyzer in the production technique of electrolytic aluminum, promptly carry out balance of voltage adjustment, by the reasonable transition of a kind of new ionogen composition a, utilize reinforcement potline current technology to make electrolytical superheating temperature can satisfy electrolyzer simultaneously and under low voltage, normally carry out then with another kind of new ionogen composition b;
A, balance of voltage adjustment new ionogen composition a in earlier stage:
Molecular ratio AlF
3/ NaF2.6-2.7%, CaF
23-5%, MgF
2Below 1%; It can reach when electric tank working voltage progressively reduces, along with electrolyzer heat income gradually reduces, and cause in the electrolytic process ionogen spontaneous nucleation around in the electrolyzer thorax, easily form regular polymer burner hearth together, this moment, electrolysis temperature still was 970-980 ℃, the secondary reaction of aluminium liquid is serious, can not reach higher current efficiency;
After B, voltage adjustment finish, for making new ionogen composition a to satisfying at subnormal voltage operation, can reaching the another kind of new ionogen composition b transition of low-temperature electrolytic stably manufactured, another kind of new ionogen composition b is by add 700-800kgAlF in each electrolyzer
3, make molecular ratio reduce to 2.2-2.4% by 2.6-2.7%, and by in electrolyzer, replenishing 80kgMgF
2, make MgF
2Content is 2.5-3%, is also formed by enrichment and makes CaF
2Content is 3-4.5%, thus, makes electrolysis temperature be reduced to 940-950 ℃;
Potline current 2KA is strengthened in C, employing, makes electrolytical superheating temperature can satisfy electrolyzer works better under low voltage.
The beneficial effect that the present invention can produce: because the present invention mainly is a low alumina concentration in the inheriting tradition production technique, lower molecular ratio, low electrolyte temperature, on the basis of low anode effect coefficient, by at first carrying out the adjustment of the balance of voltage, realize the reasonable transition of a kind of new ionogen composition a then to the new ionogen composition of another kind b, utilize reinforcement potline current technology to make electrolytical superheating temperature reach good state simultaneously, electrolyzer is moved under low voltage, promptly reduce to 4.11V or 4.10V by known bath voltage 4.3V, make ton aluminum consumption amount reduce to 13000 degree or 12900 degree by 13648 original degree, reach reduction electric tank working voltage with this, do not reduce current efficiency, finally realize energy saving purposes.
Because traditional technology has been determined the ionogen composition under the electrolyzer high working voltage, so can't under lower electric tank working voltage, keep stable operation.Therefore want to solve that electrolyzer forms shape in the regular good burner hearth under the subnormal voltage operation, guarantee the steady running of electrolyzer, must at first solve electrolytical component problem.Through research and repetition test, finally determined the ionogen composition in balance of voltage adjustment early stage: molecular ratio AlF
3/ NaF) 2.6-2.7%, CaF
23-5%, MgF
2Below 1%.
The ionogen composition that this kind is new can reach when electric tank working voltage progressively reduces, and along with electrolyzer heat income gradually reduces, and causes in the electrolytic process ionogen spontaneous nucleation around in the electrolyzer thorax, easily forms regular polymer burner hearth.If do not take above rational ionogen composition, reduce in the voltage course at it so, the excessive atrophy of burner hearth will appear, and various morbid state (moving as the aluminium fluid wave) appear in electrolyzer, cause current efficiency to glide.
Through the innovation of technique scheme, can reach the low-voltage stabilizing operation down, form good burner hearth, but electrolysis temperature reaches 970-980 ℃, the secondary reaction of aluminium liquid is serious, can not reach higher current efficiency.
Owing to have only the production of the low-temperature electrolytic of realization, just can reach higher current efficiency, reduce the secondary reaction of aluminium liquid, after so this just needs to realize that the voltage adjustment finishes, the ionogen composition is to the transition of the ionogen composition of normal electrolysis production, form under the subnormal voltage operation, keep good burner hearth, reach the new ionogen composition of low-temperature electrolytic stably manufactured simultaneously.Molecular ratio is reduced to 2.2-2.4% (interpolation 700-800kg AIF in each groove by 2.6-2.7% for this reason
3), MgF
2Content is that 2.5-3% (replenishes 80kg MgF in groove
2), CaF
2Content is 3-4.5% (being formed by enrichment); Make electrolysis temperature be reduced to 940-950 ℃ by the new prescription of above ionogen, the purpose of reached low voltage, hanging down groove temperature, high current efficiency.But electrolyzer is subjected to the high current efficiency that the low influence of superheating temperature can not stable for extended periods of time.
Because keep electrolyzer High-efficient Production steady in a long-term, and need keep good superheating temperature, behind the electric tank working loss of voltage, under new ionogen composition, the low problem of superheating temperature can appear, common way is to solve by improving electric tank working voltage, thereby returns to traditional technology again and get on.And the present invention adopts reinforcement potline current 2KA, thereby makes electrolytical superheating temperature reach good order and condition, thereby has realized the purpose of the long-term high current efficiency of electrolyzer.
By the utilization of above technology, the invention solves the technical problem of high current efficiency under the large scale electrolytic cell subnormal voltage operation.The present invention makes electrolyzer remain on steady running under the low voltage state by new ionogen, and reaches high current efficiency, low power consumption.
Embodiment
One, voltage adjustment: the ionogen composition is controlled at voltage adjusts preceding position, carry out the voltage adjustment then, its adjustment process divides three cycles that voltage is unified to certain position, then indivedual unconformable electrolyzers is specifically administered: in 7 days period 1 the electrolyzer setting voltage is adjusted to 4.2V by 4.3V; In 7 days second cycles the electrolyzer setting voltage is adjusted to 4.16V by 4.2V; In 7 days period 3 the electrolyzer setting voltage is adjusted to 4.11V or 4.10V by 4.16V.
It is as follows that other technical qualification keep in the voltage adjustment process: molecular ratio 2.6-2.7%, and electrolysis temperature 970-980 ℃, the horizontal 19-21cm of aluminium, electrolyte level 21-23CM, potline current 190KA, below the furnace bottom pressure drop 350mv, insulation material 16-18cm.
Two, the adjustment of ionogen composition
To the reasonable transition of the new ionogen composition of another kind b, fast back is slow before the interpolation principle of AIF3 by a kind of ionogen composition a, and the interpolation cycle is 15 days, adds 100kg in 1-2 days, adds 50kg in 3-6 days, adds 30kg in 7-12 days, adds 20kg in 13-15 days.MgF
2Each electrolyzer adds 80kg, and its adding method is with 80kg MgF
2Be divided into adding in 9 days, every day, each electrolyzer added 9kg, and the shell face of opening institute's change poles and adjacent two utmost points during change poles adds along limit portion, for MgF
2Daily consumption, the principle that consumes 1kg according to ton aluminium adds, each electrolyzer added 50kg in every month, its adding method is with 50kg MgF
2Divide three times in this moon in bight adding electrolyzer, require the diagonal angle to add, one-period added in turn in 10 days.
Three, reduce electric current
Electrolysis temperature is reduced to 935-945 ℃, strengthen the 2KA electric current, improve electrolyte superheat degree with this.
The technology that the present invention does not describe in detail partly is known technology.
Claims (1)
1, realizes energy-conservation method for electrolyzing aluminum by reducing bath voltage, it is characterized in that: the operating voltage that at first reduces electrolyzer in the production technique of electrolytic aluminum, promptly carry out balance of voltage adjustment, by the reasonable transition of a kind of new ionogen composition a, utilize reinforcement potline current technology to make electrolytical superheating temperature can satisfy electrolyzer simultaneously and under low voltage, normally carry out then with another kind of new ionogen composition b;
A, balance of voltage adjustment new ionogen composition a in earlier stage:
Molecular ratio AlF
3/ NaF2.6-2.7%, CaF
23-5%, MgF
2Below 1%; It can reach when electric tank working voltage progressively reduces, along with electrolyzer heat income gradually reduces, and cause in the electrolytic process ionogen spontaneous nucleation around in the electrolyzer thorax, easily form regular polymer burner hearth together, this moment, electrolysis temperature still was 970-980 ℃, the secondary reaction of aluminium liquid is serious, can not reach higher current efficiency;
After B, voltage adjustment finish, for making new ionogen composition a to satisfying at subnormal voltage operation, can reaching the another kind of new ionogen composition b transition of low-temperature electrolytic stably manufactured, another kind of new ionogen composition b is by add 700-800kg AIF in each electrolyzer
3, make molecular ratio reduce to 2.2-2.4% by 2.6-2.7%, and by in electrolyzer, replenishing 80kg MgF
2, make MgF
2Content is 2.5-3%, is also formed by enrichment and makes CaF
2Content is 3-4.5%, thus, makes electrolysis temperature be reduced to 940-950 ℃;
Potline current 2KA is strengthened in C, employing, makes electrolytical superheating temperature can satisfy electrolyzer works better under low voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410023445 CN1266313C (en) | 2004-01-18 | 2004-01-18 | Energy-saving method for preparing electrolytic aluminium by reducing bath voltage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410023445 CN1266313C (en) | 2004-01-18 | 2004-01-18 | Energy-saving method for preparing electrolytic aluminium by reducing bath voltage |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1557995A true CN1557995A (en) | 2004-12-29 |
| CN1266313C CN1266313C (en) | 2006-07-26 |
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ID=34352140
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200410023445 Expired - Fee Related CN1266313C (en) | 2004-01-18 | 2004-01-18 | Energy-saving method for preparing electrolytic aluminium by reducing bath voltage |
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| CN (1) | CN1266313C (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101260542B (en) * | 2007-11-28 | 2010-06-02 | 河南中孚实业股份有限公司 | Low polar distance energy-saving production method for aluminum electrolysis bath |
| 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 |
| CN103397347A (en) * | 2013-06-25 | 2013-11-20 | 中国铝业股份有限公司 | Method for controlling electrolytic tank voltage deviation |
| CN104164682A (en) * | 2014-09-11 | 2014-11-26 | 云南云铝润鑫铝业有限公司 | Aluminum cell computer energy balance control method |
-
2004
- 2004-01-18 CN CN 200410023445 patent/CN1266313C/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101260542B (en) * | 2007-11-28 | 2010-06-02 | 河南中孚实业股份有限公司 | Low polar distance energy-saving production method for aluminum electrolysis bath |
| 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 |
| 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 |
| CN103397347A (en) * | 2013-06-25 | 2013-11-20 | 中国铝业股份有限公司 | Method for controlling electrolytic tank voltage deviation |
| CN104164682A (en) * | 2014-09-11 | 2014-11-26 | 云南云铝润鑫铝业有限公司 | Aluminum cell computer energy balance control method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1266313C (en) | 2006-07-26 |
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