CN103820812B - A kind of aluminum electrolysis method using rich lithium aluminum - Google Patents
A kind of aluminum electrolysis method using rich lithium aluminum Download PDFInfo
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- CN103820812B CN103820812B CN201310671354.4A CN201310671354A CN103820812B CN 103820812 B CN103820812 B CN 103820812B CN 201310671354 A CN201310671354 A CN 201310671354A CN 103820812 B CN103820812 B CN 103820812B
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- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 59
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 59
- JFBZPFYRPYOZCQ-UHFFFAOYSA-N [Li].[Al] Chemical compound [Li].[Al] JFBZPFYRPYOZCQ-UHFFFAOYSA-N 0.000 title claims abstract description 57
- 238000005868 electrolysis reaction Methods 0.000 title claims abstract description 44
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Substances [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims abstract description 136
- 239000003792 electrolyte Substances 0.000 claims abstract description 51
- 238000000034 method Methods 0.000 claims abstract description 45
- 230000008569 process Effects 0.000 claims abstract description 25
- FUJCRWPEOMXPAD-UHFFFAOYSA-N Li2O Inorganic materials [Li+].[Li+].[O-2] FUJCRWPEOMXPAD-UHFFFAOYSA-N 0.000 claims description 10
- XUCJHNOBJLKZNU-UHFFFAOYSA-M dilithium;hydroxide Chemical compound [Li+].[Li+].[OH-] XUCJHNOBJLKZNU-UHFFFAOYSA-M 0.000 claims description 9
- 239000002994 raw material Substances 0.000 claims description 7
- 238000004886 process control Methods 0.000 claims description 5
- FCVHBUFELUXTLR-UHFFFAOYSA-N [Li].[AlH3] Chemical compound [Li].[AlH3] FCVHBUFELUXTLR-UHFFFAOYSA-N 0.000 claims description 4
- 239000007788 liquid Substances 0.000 claims description 4
- 229910001635 magnesium fluoride Inorganic materials 0.000 claims description 4
- -1 Fluoride salt Chemical class 0.000 claims description 3
- KKCBUQHMOMHUOY-UHFFFAOYSA-N Na2O Inorganic materials [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 20
- 239000004411 aluminium Substances 0.000 abstract description 17
- KLZUFWVZNOTSEM-UHFFFAOYSA-K Aluminium flouride Chemical compound F[Al](F)F KLZUFWVZNOTSEM-UHFFFAOYSA-K 0.000 abstract description 10
- 238000005265 energy consumption Methods 0.000 abstract description 8
- 230000002596 correlated effect Effects 0.000 abstract description 2
- 230000006872 improvement Effects 0.000 abstract description 2
- 238000013178 mathematical model Methods 0.000 abstract description 2
- 238000005728 strengthening Methods 0.000 description 8
- 238000005516 engineering process Methods 0.000 description 5
- 229910003002 lithium salt Inorganic materials 0.000 description 5
- 159000000002 lithium salts Chemical class 0.000 description 5
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 229910052744 lithium Inorganic materials 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 238000004134 energy conservation Methods 0.000 description 3
- 239000004615 ingredient Substances 0.000 description 3
- 238000001556 precipitation Methods 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 230000000630 rising effect Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000000875 corresponding effect Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 229910000754 Wrought iron Inorganic materials 0.000 description 1
- KMWBBMXGHHLDKL-UHFFFAOYSA-N [AlH3].[Si] Chemical compound [AlH3].[Si] KMWBBMXGHHLDKL-UHFFFAOYSA-N 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 229910001570 bauxite Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 150000004673 fluoride salts Chemical class 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 229910001947 lithium oxide Inorganic materials 0.000 description 1
- OBTSLRFPKIKXSZ-UHFFFAOYSA-N lithium potassium Chemical compound [Li].[K] OBTSLRFPKIKXSZ-UHFFFAOYSA-N 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 159000000001 potassium salts Chemical class 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
Abstract
A kind of aluminum electrolysis method using rich lithium aluminum, relates to a kind of aluminium electroloysis, uses the improvement of the aluminum electrolysis method of rich lithium aluminum especially.It is characterized in that in its electrolytic process, by Li in the lithium aluminum of richness set up2In O content, electrolyte, the mathematical model of LiF content and molecular proportion CR carries out the process regulation being correlated with.The method of the present invention, by setting up Li in aluminium oxide2Relational model between LiF equilibrium concentration in O content and electrolyte, Li in aluminium oxide2The electrolysis process regulation and control method model of O regulation-control model and different LiF content.System provides the rich lithium aluminum of reasonable employment to reach the energy-saving and cost-reducing method of aluminum production and measure, comprehensively defines the aluminium electroloysis energy-saving production method using rich lithium aluminum.The method application is respond well, can reduce production electrolytic aluminium energy consumption and production process aluminium fluoride consumption by a relatively large margin.
Description
Technical field
A kind of aluminum electrolysis method using rich lithium aluminum, relates to a kind of aluminium electroloysis, uses the improvement of the aluminum electrolysis method of rich lithium aluminum especially.
Background technology
Along with domestic bauxite aluminium-silicon ratio continues to reduce, the lithium content in aluminium oxide constantly rises, and the yield of rich lithium aluminum has accounted for China's Ore and produced the 60% of aluminium oxide total amount.Rich lithium aluminum uses and causes that in electrolyte, LiF content is continuously increased, electrolysis temperature continues to drop, and electrolysis bath bearth precipitation increases, bad stability, and electrolysis bath normally produces hard to carry on, energy consumption significantly raises, indivedual enterprise electrolytic aluminium energy consumption rising 500kwh/t-Al.The problem that rich lithium aluminium strip comes is extremely serious, and extensively, traditional electrolyte process is difficult to tackle the aluminum electrolysis of current rich lithium aluminum in impact, and the aluminium electroloysis power-economizing method in the urgent need to developing the rich lithium aluminum of reasonable employment solves currently to produce a difficult problem.
And use containing Li2The electrolysis enterprise of the alumina raw material that O is relatively low, its energy consumption index always more high-leveled and difficult to be greatly reduced, mainly its electrolytic conductivity poor can cause tank voltage to remain high.In conjunction with the favorable factor that the rich lithium aluminum yield of China is bigger, rational proportion uses rich lithium aluminum, electrolytic conductivity energy can be improved under the premise not increasing cost, tank voltage and current strengthening are greatly reduced, reduce energy consumption of unit product when not lost units.This is also required for the aluminium electroloysis energy-saving production method of the rich lithium aluminum of reasonable employment to realize this target.
Summary of the invention
The purpose of the present invention is aiming at the deficiency that above-mentioned prior art exists, it is provided that a kind of application is respond well, can reduce the aluminum electrolysis method using rich lithium aluminum producing electrolytic aluminium energy consumption and the consumption of production process aluminium fluoride by a relatively large margin.
It is an object of the invention to be achieved through the following technical solutions.
A kind of aluminum electrolysis method using rich lithium aluminum, it is characterised in that in its electrolytic process, by Li in the lithium aluminum of richness set up2In O content, electrolyte, the mathematical model of LiF content and molecular proportion CR carries out the process regulation being correlated with.
A kind of aluminum electrolysis method using rich lithium aluminum of the present invention, it is characterised in that in its electrolytic process, Li in rich lithium aluminum2O content presses columns model cootrol:
w(Li2O)Aluminium oxide=0.577×[2×(MAluminium oxide+B)×w(LiF)Electrolyte+3.714×A]÷MAluminium oxide。
A kind of aluminum electrolysis method using rich lithium aluminum of the present invention, it is characterised in that in its electrolytic process, in electrolyte, LiF presses columns model cootrol: w (LiF)Electrolyte=K×[1.733×MAluminium oxide×w(Li2O)Aluminium oxide-3714 × w (Li)Aluminum liquid]÷{MFluoride salt+MAluminium oxide×[0.452×w(Na2O)Aluminium oxide+0.638×w(K2O)Aluminium oxide+0.393×w(CaO)Aluminium oxide+0.15×w(MgO)Aluminium oxide-0.133 × w (Li2O)Aluminium oxide]}。
A kind of aluminum electrolysis method using rich lithium aluminum of the present invention, it is characterised in that in its electrolytic process, molecular proportion CR presses columns model cootrol: CR=3.334+0.0942 × LiF%-0.0446 × KF%+0.0098 × MgF2%-0.0070×ΔT-0.0895×AO-0.0452×t。
A kind of aluminum electrolysis method using rich lithium aluminum of the present invention, it is characterised in that its electrolytic process controls the Li in alumina raw material2O mass content is 0.03%～0.10%.
A kind of aluminum electrolysis method using rich lithium aluminum of the present invention, it is characterised in that the LiF matter weight content that its electrolytic process controls in electrolyte used is 2.5-5.8%.
A kind of aluminum electrolysis method using rich lithium aluminum of the present invention, it is characterised in that its electrolytic process electrolyte molecule ratio is 2.50～2.70.
A kind of aluminum electrolysis method using rich lithium aluminum of the present invention, it is characterised in that its electrolytic process electrolyte level is 16～20cm, and aluminum level is 20～24cm.
A kind of aluminum electrolysis method using rich lithium aluminum of the present invention, it is characterised in that Li in its electrolytic process aluminium oxide2O content is 0.05%～0.08%, and its electrolyte LiF content is 2.5～4.5%, and electrolyte temperature is 930～945 DEG C；Common flat-bottom slot average cell voltage is 3.90～3.95V.
A kind of aluminum electrolysis method using rich lithium aluminum of the present invention, by setting up Li in aluminium oxide2Relational model between LiF equilibrium concentration in O content and electrolyte, Li in aluminium oxide2The electrolysis process regulation and control method model of O regulation-control model and different LiF content.System provides the rich lithium aluminum of reasonable employment to reach the energy-saving and cost-reducing method of aluminum production and measure, comprehensively defines the aluminium electroloysis energy-saving production method using rich lithium aluminum.The method application is respond well, can reduce production electrolytic aluminium energy consumption and production process aluminium fluoride consumption by a relatively large margin.
Detailed description of the invention
A kind of aluminum electrolysis method using rich lithium aluminum, establishes Li in rich lithium aluminum2O content and the empirical model of LiF equilibrium concentration: w (LiF) in electrolyteElectrolyte=K×[1.733×MAluminium oxide×w(Li2O)Aluminium oxide-3714 × w (Li)Aluminum liquid]÷{MFluoride salt+MAluminium oxide×[0.452×w(Na2O)Aluminium oxide+0.638×w(K2O)Aluminium oxide+0.393×w(CaO)Aluminium oxide+0.15×w(MgO)Aluminium oxide-0.133 × w (Li2O)Aluminium oxide]}。
Wherein K span is between 0.3～0.9.Use is mixed Li in rich lithium aluminum rear oxidation aluminum feedstock2O content controls 0.03～0.10%, and the corresponding LiF content in electrolyte can be controlled in 2.5-5.8%.
Develop Li in rich lithium aluminum2O content regulation and control method: w (Li2O)Aluminium oxide=0.577×[2×(MAluminium oxide+B)×w(LiF)Electrolyte+3.714×A]÷MAluminium oxide。
A represents the Li amount that ton aluminium strip is walked, and B represents that ton aluminum consumes the quality of aluminium oxide electrolyte supplement.
Can by several different Li2The aluminium oxide mixture of O content uses, and can reach purpose that is not only energy-conservation but also that reduce purchase cost.
Aluminum electrolysis process regulation and control method under the different LiF content of exploitation:
CR=3.334+0.0942×LiF%-0.0446×KF%+0.0098×MgF2%-0.0070×ΔT-0.0895×AO-0.0452×t
Δ T is the degree of superheat, DEG C；T is that 1% aluminium oxide is completely dissolved time, min；AO is alumina type, value 1～3；
The scope of application: molecular proportion CR2.0～3.4, LiF0～10%, MgF20～4%, KF0～6%.
Although being entered the increase of LiF content in electrolyte by rich lithium aluminium strip, can cause that current efficiency reduces, by rich lithium aluminum electrolysis process control technique method, still having the energy-conservation amplitude of 150-600kW.h/tAl.
The aluminium electroloysis energy-saving production method of rich lithium aluminum under high lithium low temperature state: the type electrolysis production series (some small electrolytics series of the ground such as Gansu, Qinghai, Shanxi, Henan) continues to be enriched with along with alumina raw material brings lithium salts in the electrolyte, and in electrolyte, lithium salt content has reached about 4～5%.Now, electrolysis process still continues to use traditional " efficient cryogenic " technology path, electrolytic series occurs that current efficiency reduces, alumina concentration raises, noise increases, and the degree of superheat raises automatically, and stove side is thinning, the problems such as bearth precipitation increase, badly influence the properly functioning maintenance with good index of electrolysis production.
This invention address that the technology method of this problem is on the rich lithium aluminum feedstock basis of reasonable employment, elemental lithium content in the lithium oxide content rich lithium aluminum of regulation and control method adjustment of rich lithium aluminum is utilized to carry out LiF concentration in stable electrolyte, electrolytic conductivity energy is improved by adjusting electrolyte molecule ratio, reduce tank voltage, it is thus achieved that moderately good electrolysis production economic indicator.
For certain 160KA electrolytic series procedures set forth detailed description of the invention.
This 160KA series grooved applies double; two rod iron cathode electrolytic cell after applying new structure electrolysis bath, overhaul after having original design mode (common platybasic type), overhaul.Before implementing, series average voltage is 3.95 ~ 4.00V, and current efficiency is 89.0 ~ 90.0%, and direct current consumption is 13200 ~ 13250kWh/t, and the comprehensive power consumption of aluminium ingot is 14019kW.h/tAl.Anodic current density 0.78A/cm2, anode effect coefficient 0.04 ~ 0.06 time/groove day, aluminium fluoride unit consumption 18 ~ 20kg/t, aluminium oxide unit consumption 1925 ~ 1935kg/t, anode hair consumption 485 ~ 495kg/t, anode consumes 425 ~ 430kg/t only.
First Li in rich lithium aluminum is allocated2O content so as to < 0.10%, make LiF concentration in electrolyte do not continue to rise, be maintained at less than 5.8%.
Secondly improving electrolyte molecule ratio, molecular proportion is increased to 2.50～2.70 by 2.30～2.40, thus improves electrolytic conductivity and to improve pole span, can strengthen electrolysis bath stability, reduces tank voltage and forms high molecule ratio stove side offer condition.Can also thus improve electrolyte aluminium oxide solvability to reduce bearth precipitation elimination of level electric current, improve current efficiency.
Electrolyte molecule is than adjustment mode for stopping or reducing aluminium fluoride addition, and molecular proportion is maintained at 2.50～2.70.Electrolyte level controls at 18～22cm, and the best is 19～21cm, and aluminum level controls at 18 ~ 26cm, and the best is 20 ~ 24cm；Electrolysis temperature controls between 925～935 DEG C.Between regular troughs sidepiece temperature averages decreasing value 220～260 DEG C, peak is not higher than 320 DEG C.New structure electrolysis bath sidepiece temperature averages is at 200～230 DEG C, and high point temperature is less than 280 DEG C.Double; two steel bar trough sidepiece temperature averages are at 180～210 DEG C, and high point temperature value is less than 250 DEG C, and local is crossed high point and can be acted upon by modes such as manual intervention repairings.
Stable and the suitable degree of superheat of electrolyte ingredient is realized by finely tuning electrolyte molecule ratio, the degree of superheat, aluminum liquid horizontal height and the technical conditions such as setting voltage and electrolysis bath insulation, reaching the energy balance stable, current efficiency is higher and the stable purpose at reduced levels of tank voltage.
Implementing after current efficiency and improve 1.08% on year-on-year basis, direct current consumption reduces 164kW.h/tAl on year-on-year basis, and aluminium fluoride unit consumption reduces 1.61kg on year-on-year basis, and anode hair consumption reduces 3.62kg on year-on-year basis.
Lithium content continues rich lithium aluminum aluminium electroloysis energy-saving production method under increasing state: the lithium salts that the type electrolysis production series enters electrolytic series along with alumina raw material is in rising trend, have realized that this trend at the variation initial stage simultaneously, and utilize the aluminium electroloysis skill of rich lithium aluminum to carry out to respond actively, produce series big fluctuation does not occur and repeatedly, keeps comparatively good technical data and economic indicator.
Detailed description of the invention is set forth for certain 300KA.
This series grooved has common flat-bottom slot and new structure groove, and anodic current density is 0.716A/cm2, alumina raw material major part for a long time uses import aluminium oxide, after use rich lithium aluminum instead, along with rich lithium aluminum uses, its electrolyte LiF content is in gradually rising trend.
(1) allotment uses rich lithium aluminum, makes Li in aluminium oxide2O content is stable 0.03～0.07%, and in corresponding electrolyte, LiF concentration is 2.5～4.7%.
(2) by have adjusted electrolyte ingredient in time, its electrolysis temperature downward trend is more slow.And along with the adjustment of electrolyte ingredient, its electrical conductivity ascensional range is relatively big, increases production consumption reduction for tandem reinforcement electric current and provides probability.
(3) change according to lithium salts, potassium salts content, have employed high connductivity electrolyte system and current strengthening technology method.During enforcement, lithium potassium content continues to rise, LiF content from promote before 2.2% accumulation rise to about 4.2%.
(4) continue to adjust electrolyte control composition in implementation process, by current strengthening and adjustment heat radiation distribution, continue to carry out low-voltage route when keeping freeze thaw stability and energy demand.
Enforcement takes and reduces the tank voltage method to exchange current strengthening space for by reduction pole span.Highly desirable from actual effect result.Pole span is reduced to 4.1cm from 4.4cm, and current intensity is enhanced to 300.4KA by initial 280KA, and anodic current density is 0.755A/cm2, tank voltage is still maintained at 3.934V, and the energy balance remains intact.
After enforcement, series of grooves voltage is down to 3.94V stage by stage by 4.05V, current intensity is enhanced to 300.4KA by 280KA, direct current consumption then have dropped 136KWh/tAl, considers the comprehensive consumption that current strengthening brings and reduces and put forward product effect, and its economic benefit is still clearly and prominent.
Rich lithium aluminum aluminium electroloysis energy-saving production method under relatively low lithium salts state
Domestic have a lot of electrolytic series (Guangxi, Yunnan, Shandong, northeast, Xinjiang) to adopt sandy alumina or intermediate alumina, in its electrolyte, LiF content is relatively low, and technical characterstic is three high and one low (high voltage, high current efficiency, high current density and lower molecular ratio).Rise due to energy cost and aluminum valency is low, it is possible to use the aluminium electroloysis energy-saving production method of rich lithium aluminum reduces energy consumption.
Detailed description of the invention is set forth for certain enterprise 200KA.
This series of grooves voltage 4.12V, current efficiency is 92%, ton aluminum direct current consumption 13345kwh.
(1) adjust it and produce alumina raw material source used, by Li in aluminium oxide2O content is from < 0.01% was increased to current 0.05～0.08%, and low cost increases LiF content in its electrolyte originally.
(2) progressively being adjusted between 4.0～4.5% by 1.5% by its electrolyte LiF content, coordinate and progressively properly increase molecular proportion, make molecular proportion be maintained in the scope that rich lithium aluminium electrolyte technique needs, electrolyte temperature is down to 930～940 DEG C by 955～965 DEG C.
(3) technique reducing bath temperature and reducing voltage cooperation is adopted, height is utilized to lead discharged pole span compression stage from 5-8mm, the reduction of auxiliary anode, fixture, furnace bottom and anode effect coefficient, makes tank voltage gradually reduce to 3.90～3.95V, carries out the application of rich lithium aluminum high connductivity solution Technique Popularizing.
(4) while of strengthening being incubated minimizing heat radiation, suitably current strengthening declines with yield to make up energy minimizing.
After enforcement, aluminum pot working voltage is reduced to 3.88V from 4.08V, and ton aluminum direct current consumption is reduced to 12650kwh from 13060kwh, and ton aluminum is saved fluoride salt and consumed 2.6kg.
It is pointed out that, although ton aluminum direct current consumption declines to some extent, but owing to having carried out the strengthening of some electric currents, its yield does not reduce.Therefore, rich lithium aluminum high connductivity solution technology is applied, and is not only beneficial to energy-conservation and comprehensive utilization of resources, is beneficial to environmental conservation simultaneously and reduces production cost, having good economic benefit and social benefit.
Claims (5)
1. the aluminum electrolysis method using rich lithium aluminum, it is characterised in that use in rich lithium aluminium electrolysis process, by Li in the lithium aluminum of richness set up2Relational model between LiF content in O content and electrolyte, carries out associated process conditions control by the corresponding core process conditions Molecular mathematics Matching Model than CR；
In its electrolytic process, Li in rich lithium aluminum2O content presses columns model cootrol: w (Li2O)Aluminium oxide=0.577×[2×(MAluminium oxide+B)×w(LiF)Electrolyte+3.714×A]÷MAluminium oxide；
In its electrolytic process, in electrolyte, LiF presses columns model cootrol: w (LiF)Electrolyte=K×[1.733×MAluminium oxide×w(Li2O)Aluminium oxide-3714 × w (Li)Aluminum liquid]÷{MFluoride salt+MAluminium oxide×[0.452×w(Na2O)Aluminium oxide+0.638×w(K2O)Aluminium oxide+0.393×w(CaO)Aluminium oxide+0.15×w(MgO)Aluminium oxide-0.133 × w (Li2O)Aluminium oxide]}；
In its electrolytic process, molecular proportion CR presses columns model cootrol: CR=3.334+0.0942 × LiF%-0.0446 × KF%+0.0098 × MgF2%-0.0070×ΔT-0.0895×AO-0.0452×t；
Its electrolytic process controls the Li in alumina raw material2O mass content is 0.03%～0.10%.
2. a kind of aluminum electrolysis method using rich lithium aluminum according to claim 1, it is characterised in that the LiF matter weight content that its electrolytic process controls in electrolyte used is 2.5-5.8%.
3. a kind of aluminum electrolysis method using rich lithium aluminum according to claim 1, it is characterised in that its electrolytic process electrolyte molecule ratio is 2.50～2.70.
4. a kind of aluminum electrolysis method using rich lithium aluminum according to claim 1, it is characterised in that its electrolytic process electrolyte level is 16～20cm, and aluminum level is 20～24cm.
5. a kind of aluminum electrolysis method using rich lithium aluminum according to claim 1, it is characterised in that Li in its electrolytic process aluminium oxide2O content is 0.05%～0.08%, and its electrolyte LiF content is 2.5～4.5%, and electrolyte temperature is 930～945 DEG C；Common flat-bottom slot average cell voltage is 3.90～3.95V.
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| CN107541753B (en) * | 2017-08-10 | 2019-06-14 | 中国铝业股份有限公司 | A method of removing Hull cell is containing lithium in lithium electrolyte |
| CN112176364B (en) * | 2020-08-17 | 2021-07-20 | 中铝郑州有色金属研究院有限公司 | Method for controlling lithium and potassium content in aluminum electrolyte |
| CN113373481B (en) * | 2021-05-27 | 2023-08-01 | 中国铝业股份有限公司 | Low-char content and high-current efficiency aluminium electrolysis method using potassium-rich aluminium oxide |
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| GB1304582A (en) * | 1969-03-18 | 1973-01-24 | ||
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