CN1974863A - Aluminium electrolyzing process - Google Patents
Aluminium electrolyzing process Download PDFInfo
- Publication number
- CN1974863A CN1974863A CN 200610162010 CN200610162010A CN1974863A CN 1974863 A CN1974863 A CN 1974863A CN 200610162010 CN200610162010 CN 200610162010 CN 200610162010 A CN200610162010 A CN 200610162010A CN 1974863 A CN1974863 A CN 1974863A
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- Prior art keywords
- electrolysis
- temperature
- aluminum
- ionogen
- electrolytic
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- 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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- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 25
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 21
- 238000000034 method Methods 0.000 title claims abstract description 12
- 239000004411 aluminium Substances 0.000 title claims description 7
- 238000005868 electrolysis reaction Methods 0.000 claims abstract description 27
- -1 sodium aluminum fluoride Chemical compound 0.000 claims description 6
- 239000003792 electrolyte Substances 0.000 abstract description 4
- KLZUFWVZNOTSEM-UHFFFAOYSA-K Aluminium flouride Chemical compound F[Al](F)F KLZUFWVZNOTSEM-UHFFFAOYSA-K 0.000 abstract 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 abstract 2
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 abstract 1
- 229910001634 calcium fluoride Inorganic materials 0.000 abstract 1
- 229910052593 corundum Inorganic materials 0.000 abstract 1
- 229910001610 cryolite Inorganic materials 0.000 abstract 1
- 239000000463 material Substances 0.000 abstract 1
- 229910001845 yogo sapphire Inorganic materials 0.000 abstract 1
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000001556 precipitation Methods 0.000 description 4
- 229910004261 CaF 2 Inorganic materials 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 150000004673 fluoride salts Chemical class 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 2
- 229910016569 AlF 3 Inorganic materials 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 229910003002 lithium salt Inorganic materials 0.000 description 1
- 159000000002 lithium salts Chemical class 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
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- Electrolytic Production Of Metals (AREA)
Abstract
The aluminum electrolyzing process with alumina as material to produce aluminum features the electrolyte comprising LiF 2-5 wt%, CaF2 2-5 wt%, Al2O3 1.5-3.0 wt%, and cryolite with NaF/AlF3 molar ratio not higher than 2.3 for the rest. The process has initial crystallizing temperature of the electrolyte not higher than 920 deg.c, superheating degree of 5-12 deg.c, and electrolysis temperature no higher than 935 deg.c. The present invention has no encrusting and melting-off of the electrolytic furnace, high current efficiency, low power consumption and improved economic and technological indexes.
Description
Technical field
A kind of aluminum electrolysis method, relating to a kind of aluminum oxide that adopts is the method for raw material electrolytic production of aluminum.
Electrolysis of aluminum
Background technology
In the Aluminium Electrolysis process, reduce electrolysis temperature and can reduce thermosteresis.Experimental study shows, reduces by 10 ℃ of electrolysis temperatures, approximately can improve current efficiency 1%, reduces power consumption 220kwh/t.Al.Along with molecular ratio is NaF/AlF
3Reducing of mol ratio, electrolytical fusing point can reduce, but the dissolution rate of aluminum oxide reduces.In various additives, LiF can significantly reduce the electrolyte primary crystal temperature, and can improve electrolytical electric conductivity and reduce electrolytical vapour pressure.But, limited industrial application because lithium salts costs an arm and a leg.
At present, industrial aluminum electrolysis bath 2.1～2.4 lower molecular ratio ionogen that adopt are produced more in the world, and electrolysis temperature is generally 945 ℃～960 ℃.Under above-mentioned working condition, liquidus temperature is higher, and when superheating temperature was low, electrolysis temperature was higher; When superheating temperature was higher, electrolysis temperature was higher.And lower molecular ratio electrolysis production furnace bottom easily generates precipitation crust, and stove group is difficult for forming, and has influenced the stability and the technico-economical comparison of electrolysis production.
Summary of the invention
The objective of the invention is deficiency, provide a kind of being implemented under low liquidus temperature, the condition to carry out electrolysis, realize stable aluminum electrolysis method efficiently than low overheat and low electrolysis temperature at above-mentioned prior art existence.
The objective of the invention is to be achieved through the following technical solutions.
A kind of aluminum electrolysis method, its feature contain LiF, the 2%～5%CaF that accounts for ionogen gross weight 2%～5% in its electrolytic ionogen
2, 1.5%～3.0%Al
2O
3, surplus is a sodium aluminum fluoride, and the NaF/AlF in the sodium aluminum fluoride
3Mol ratio≤2.3.
Method of the present invention, the aluminium level that it is characterized in that its electrolytic process are that 18～25cm, bath voltage are 4.0～4.2V, effect coefficient＜0.15 time/groove day.
Adopt method of the present invention, making the electrolyte primary crystal temperature be not more than 920 ℃, superheating temperature is that 5～12 ℃ and electrolysis temperature are not more than 935 ℃.Solved low-temperature electrolytic production furnace bottom and easily generated the precipitation crust, sideways furnace wall is the difficult problem of fusing easily.The electrolyzer burner hearth is regular stable, forms suitably thick stove group, and furnace bottom does not have crust.Technico-economical comparison improves obviously, improves current efficiency, reduces power consumption.
Embodiment
A kind of aluminum electrolysis method contains 2%～5% LiF, the 2%～5%CaF that account for the ionogen gross weight in its electrolytic ionogen
2, 1.5%～3.0% Al
2O
3, surplus is a sodium aluminum fluoride, and the NaF/AlF in the sodium aluminum fluoride
3Mol ratio≤2.3.The aluminium level of its electrolytic process is that 18～25cm, bath voltage are 4.0～4.2V, effect coefficient＜0.15 time/groove day.
Embodiment 1
In the ionogen of electrolysis of aluminum, molecular ratio is 2.3, account for the LiF of ionogen gross weight 2% and 4% CaF
2, Al
2O
3Be that 1.5%～3.0% optimization ionogen is formed, the aluminium level of its electrolytic process is that 18～25cm, bath voltage are 4.0～4.2V, effect coefficient＜0.15 time/groove day.Electrolytic liquidus temperature is that 920 ℃, superheating temperature are 5～12 ℃ and electrolysis temperature 925-932 ℃, the unified three low new technologies of optimizing have mutually been realized, furnace bottom does not generate the precipitation crust, sideways furnace wall is difficult for fusing, electrolysis operates steadily, the current efficiency height, and direct current consumption is low, anode consumption and fluoride salt consume low, and the anode effect coefficient is low.
Embodiment 2
In the ionogen of electrolysis of aluminum, molecular ratio is 2.3, account for the LiF of ionogen gross weight 4% and 2% CaF
2, in conjunction with 1.5%～3.0%Al
2O
3The optimization ionogen form, the aluminium level of its electrolytic process is that 18～25cm, bath voltage are 4.0～4.2V, effect coefficient＜0.15 time/groove day.Liquidus temperature is that 910 ℃, superheating temperature are that 5～10 ℃ and electrolysis temperature are 920-930 ℃, and furnace bottom does not generate the precipitation crust, and sideways furnace wall is difficult for fusing, electrolysis operates steadily, the current efficiency height, and direct current consumption is low, anode consumption and fluoride salt consume low, and the anode effect coefficient is low.
Claims (2)
1. aluminum electrolysis method, its feature contains LiF, the 2%～5%CaF that accounts for ionogen gross weight 2%～5% in its electrolytic ionogen
2, 1.5%～3.0%Al
2O
3, surplus is a sodium aluminum fluoride, and the NaF/AlF in the sodium aluminum fluoride
3Mol ratio≤2.3.
2. a kind of aluminum electrolysis method according to claim 1, the aluminium level that it is characterized in that its electrolytic process are that 18～25cm, bath voltage are 4.0～4.2V, effect coefficient＜0.15 time/groove day.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610162010 CN1974863A (en) | 2006-12-08 | 2006-12-08 | Aluminium electrolyzing process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610162010 CN1974863A (en) | 2006-12-08 | 2006-12-08 | Aluminium electrolyzing process |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1974863A true CN1974863A (en) | 2007-06-06 |
Family
ID=38125204
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200610162010 Pending CN1974863A (en) | 2006-12-08 | 2006-12-08 | Aluminium electrolyzing process |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1974863A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102051639A (en) * | 2011-01-30 | 2011-05-11 | 中国铝业股份有限公司 | Method for eliminating crust breaking chip bulge of aluminum cell |
| CN102296328A (en) * | 2011-07-01 | 2011-12-28 | 云南云铝涌鑫铝业有限公司 | Low temperature control method for aluminum electrolysis |
| CN102817044A (en) * | 2012-07-27 | 2012-12-12 | 中国铝业股份有限公司 | Aluminium electrolyte and using method thereof |
| 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 |
| CN109735873A (en) * | 2019-03-23 | 2019-05-10 | 曲靖云铝淯鑫铝业有限公司 | A kind of production technology of high-quality aluminium ingot |
-
2006
- 2006-12-08 CN CN 200610162010 patent/CN1974863A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102051639A (en) * | 2011-01-30 | 2011-05-11 | 中国铝业股份有限公司 | Method for eliminating crust breaking chip bulge of aluminum cell |
| CN102051639B (en) * | 2011-01-30 | 2014-06-04 | 中国铝业股份有限公司 | Method for eliminating crust breaking chip bulge of aluminum cell |
| CN102296328A (en) * | 2011-07-01 | 2011-12-28 | 云南云铝涌鑫铝业有限公司 | Low temperature control method for aluminum electrolysis |
| 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 |
| CN102817044A (en) * | 2012-07-27 | 2012-12-12 | 中国铝业股份有限公司 | Aluminium electrolyte and using method thereof |
| CN109735873A (en) * | 2019-03-23 | 2019-05-10 | 曲靖云铝淯鑫铝业有限公司 | A kind of production technology of high-quality aluminium ingot |
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| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |