CN101255574A - Potassium salt system electrolyte for aluminium electrolysis - Google Patents
Potassium salt system electrolyte for aluminium electrolysis Download PDFInfo
- Publication number
- CN101255574A CN101255574A CNA2007101796206A CN200710179620A CN101255574A CN 101255574 A CN101255574 A CN 101255574A CN A2007101796206 A CNA2007101796206 A CN A2007101796206A CN 200710179620 A CN200710179620 A CN 200710179620A CN 101255574 A CN101255574 A CN 101255574A
- Authority
- CN
- China
- Prior art keywords
- electrolyte
- alf
- lif
- k3alf6
- alf3
- Prior art date
- 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.)
- Pending
Links
- 239000003792 electrolyte Substances 0.000 title claims abstract description 28
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 19
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 16
- 238000005868 electrolysis reaction Methods 0.000 title claims abstract description 16
- 239000004411 aluminium Substances 0.000 title claims description 13
- XAEFZNCEHLXOMS-UHFFFAOYSA-M potassium benzoate Chemical compound [K+].[O-]C(=O)C1=CC=CC=C1 XAEFZNCEHLXOMS-UHFFFAOYSA-M 0.000 title claims description 8
- 229910016569 AlF 3 Inorganic materials 0.000 claims description 14
- 229910004261 CaF 2 Inorganic materials 0.000 claims description 9
- 229910052700 potassium Inorganic materials 0.000 claims description 6
- KLZUFWVZNOTSEM-UHFFFAOYSA-K Aluminium flouride Chemical compound F[Al](F)F KLZUFWVZNOTSEM-UHFFFAOYSA-K 0.000 abstract description 8
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 abstract description 6
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 abstract 2
- 229910001634 calcium fluoride Inorganic materials 0.000 abstract 2
- 229910052593 corundum Inorganic materials 0.000 abstract 2
- 229910001610 cryolite Inorganic materials 0.000 abstract 2
- PQXKHYXIUOZZFA-UHFFFAOYSA-M lithium fluoride Inorganic materials [Li+].[F-] PQXKHYXIUOZZFA-UHFFFAOYSA-M 0.000 abstract 2
- 229910001635 magnesium fluoride Inorganic materials 0.000 abstract 2
- 229910001845 yogo sapphire Inorganic materials 0.000 abstract 2
- -1 K3AlF6 Inorganic materials 0.000 abstract 1
- 238000002425 crystallisation Methods 0.000 abstract 1
- 230000008025 crystallization Effects 0.000 abstract 1
- 230000002708 enhancing effect Effects 0.000 abstract 1
- BMQVDVJKPMGHDO-UHFFFAOYSA-K magnesium;potassium;chloride;sulfate;trihydrate Chemical compound O.O.O.[Mg+2].[Cl-].[K+].[O-]S([O-])(=O)=O BMQVDVJKPMGHDO-UHFFFAOYSA-K 0.000 abstract 1
- 239000000463 material Substances 0.000 abstract 1
- 239000011734 sodium Substances 0.000 description 8
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 7
- 238000004090 dissolution Methods 0.000 description 4
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical compound [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 239000013078 crystal Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 238000005303 weighing Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 239000008280 blood Substances 0.000 description 1
- 210000004369 blood Anatomy 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 235000011164 potassium chloride Nutrition 0.000 description 1
- 239000001103 potassium chloride Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
Abstract
The invention relates to a kainite system electrolyte for aluminum electrolysis, characterized in that the invention is prepared by LiF, CaF2, MgF2, K3AlF6, Al2O3, Na3AlF6 and AlF3; based on mass proportion, proportion of each component is: LiF 0.5% to 3.0%, CaF2 3.0% to 6.0%, MgF2 1.0% to 2.5%, K3AlF6 0% to 5.0%, others are Al2O3, Na3AlF6 and AlF3, mixing ratio of which controls the molecular ratio of the electrolyte (mol ratio of NaF and AlF3) 2.0 to 2.4. The invention improves the components of the industrial electrolyte based on adding little K3AlF6, the electrolyte improved only reducing temperature of initial crystallization, but also enhancing dissolving speed of alumina to a great extent, improving dissolve degree of the alumina in the electrolyte under condition that volatilization loss is enhanced and the anode of the electrolyte groove and inner liner material are eroded. The invention has higher electrical conductivity.
Description
Technical field
The present invention relates to a kind of potassium salt system electrolyte for aluminium electrolysis.
Technical background
Sodium cryolite-alumina molten salt method electrolysis is the prefered method that present large-scale pre-baked aluminum electrolysis cell is produced metallic aluminium.But facts have proved for many years, this method electrolysis temperature height (940～960 ℃), the alumina dissolution degree is low, electric conductivity is low (about 2S/cm
2), energy consumption is high and heavy-polluted shortcoming.
Ionogen is the blood of electrolyzer, the composition of electrolyte system and the stable Aluminium Electrolysis quality and stable that determining.And the whether good of electrolyte system embodied by electrolytical various rerum naturas, and the composition of electrolyte system is determining the rerum natura of electrolyte system simultaneously.For Study on Additive is electrolysis of aluminum industry problem all the time.Recently some research tends to add a large amount of KF (2%～10%, number of patent application 200610051113.X) or K in original ionogen
3AlF
6(50%～80%, number of patent application 200510011143.3), to reduce electrolysis temperature significantly, but studies show that the ionogen of these compositions all needs to be equipped with the electrolyzer of particular design, if be used on the existing industrial aluminum electrolysis bath, because its sylvite content height, can the heavy corrosion liner and negative electrode, and volatilization loss can obviously increase, this finally will cause cell life to shorten, the harm of environment is increased.
Summary of the invention
The objective of the invention is to deficiency at above-mentioned prior art existence, providing a kind of can hang down under the liquidus temperature, do not increasing under ionogen volatilization loss and the situation thereof cell lining and cathodic corrosion, promote dissolution rate and the solubleness of aluminum oxide in ionogen, and have higher specific conductivity potassium salt system electrolyte for aluminium electrolysis.
The objective of the invention is by realizing with technical scheme.
A kind of potassium salt system electrolyte for aluminium electrolysis is characterized in that it is by LiF, CaF
2, MgF
2, K
3AlF
6, Al
2O
3, Na
3AlF
6And AlF
3Formulated; Press mass ratio and calculate, each component proportion is: LiF0.5%～3.0%, CaF
23.0%～6.0%, MgF
21.0%～2.5%, K
3AlF
60～5.0%, all the other are Na
3AlF
6And AlF
3, its proportioning control electrolyte molecule is than (NaF and AlF
3Mol ratio) 2.0～2.4.
A kind of potassium salt system electrolyte for aluminium electrolysis of the present invention, electrolytical liquidus temperature is 880～910 ℃, and when 20 ℃ of superheating temperature, aluminum oxide saturation solubility therein is 12.0%～15.0%, and the dissolution rate of aluminum oxide obviously improves, and specific conductivity is at 2.4～2.5S/cm.
The present invention compares with existing aluminum electrolyzation technology, processing temperature decreases, the dissolution rate and the solubleness of aluminum oxide obviously improve, and LiF addition seldom (application number is a LiF content 2%～40% in the patent of 200610051113.X), sometimes the raw material LiF amount of bringing into just can meet the demands, so the application of this invention can not only reduce bath voltage, reduce a ton aluminium fluoride volatilization loss effectively, improve the potroom production environment to a certain extent, prolong cell life, and because the LiF addition is few even it is zero to be, it also has lower production run cost; In addition, because this electrolyte system is less to the corrosion of cell lining and negative electrode,, it produces so can directly applying to the modern aluminum electrolytic industry.
Embodiment
A kind of potassium salt system electrolyte for aluminium electrolysis is characterized in that it is by LiF, CaF
2, MgF
2, K
3AlF
6, Al
2O
3, Na
3AlF
6And AlF
3Formulated; Press mass ratio and calculate, each component proportion is: LiF0.5%～3.0%, CaF
23.0%～6.0%, MgF
21.0%～2.5%, K
3AlF
60～5.0% (amounting to KF0～1.6%), all the other are Na
3AlF
6And AlF
3, this proportioning control electrolyte molecule is than (NaF and AlF
3Mol ratio) 2.0～2.4, be mixed with the used ionogen of electrolyzer according to a conventional method.
Embodiment 1
Get LiF 1.5%, CaF
26.0%, MgF
22.0%, K
3AlF
60, Al
2O
32.0%, all the other are Na
3AlF
6And AlF
3, this proportioning control electrolyte molecule is than (NaF and AlF
3Mol ratio) be 2.0, weighing by mass percentage is good, puts into aluminium cell behind the uniform mixing for produce using.Under this component, when 880 ℃ of electrolyte primary crystal temperature, 20 ℃ of superheating temperature, the saturation solubility of aluminum oxide is 12.0%.
Embodiment 2
Get LiF 1.0%, CaF
25.0%, MgF
21.5%, K
3AlF
62.5% (amounting to KF 0.8%), Al
2O
32.0%, all the other are Na
3AlF
6And AlF
3, this proportioning control electrolyte molecule is than (NaF and AlF
3Mol ratio) be 2.2, weighing by mass percentage is good, puts into aluminium cell behind the uniform mixing for produce using.Under this component, when 882 ℃ of electrolyte primary crystal temperature, 20 ℃ of superheating temperature, the saturation solubility of aluminum oxide is 13.3%.
Embodiment 3
Get LiF 1.0%, CaF
25.0%, MgF
21.5%, K
3AlF
65.0% (amounting to KF 1.6%), Al
2O
32.5%, all the other are Na
3AlF
6And AlF
3, this proportioning control electrolyte molecule is than (NaF and AlF
3Mol ratio) be 2.4, weighing by mass percentage is good, puts into aluminium cell behind the uniform mixing for produce using.Under this component, when 910 ℃ of electrolyte primary crystal temperature, 20 ℃ of superheating temperature, the saturation solubility of aluminum oxide is 15.0%.
Claims (1)
1. a potassium salt system electrolyte for aluminium electrolysis is characterized in that it is by LiF, CaF
2, MgF
2, K
3AlF
6, Al
2O
3, Na
3AlF
6And AlF
3Formulated; Press mass ratio and calculate, each component proportion is: LiF0.5%～3.0%, CaF
23.0%～6.0%, MgF
21.0%～2.5%, K
3AlF
60～5.0%, all the other are Na
3AlF
6And AlF
3, its proportioning control electrolyte molecule ratio is 2.0～2.4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101796206A CN101255574A (en) | 2007-12-17 | 2007-12-17 | Potassium salt system electrolyte for aluminium electrolysis |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101796206A CN101255574A (en) | 2007-12-17 | 2007-12-17 | Potassium salt system electrolyte for aluminium electrolysis |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101255574A true CN101255574A (en) | 2008-09-03 |
Family
ID=39890662
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2007101796206A Pending CN101255574A (en) | 2007-12-17 | 2007-12-17 | Potassium salt system electrolyte for aluminium electrolysis |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101255574A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101857961A (en) * | 2010-06-13 | 2010-10-13 | 中国铝业股份有限公司 | Method for reducing per-unit production energy consumption of aluminium electrolytic bath |
| CN102312252A (en) * | 2011-09-09 | 2012-01-11 | 东北大学 | Method for improving alumina dissolution rate in aluminium electrolysis process |
| 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 |
| CN103643259A (en) * | 2013-12-05 | 2014-03-19 | 东北大学 | Method for extracting metal and preparing oxygen from lunar soil/lunar rock mixed oxides |
| CN103820818A (en) * | 2013-12-30 | 2014-05-28 | 中国神华能源股份有限公司 | Aluminum electrolysis plastidome for aluminum oxide electrolysis of one-step acid solution method production and application of aluminum electrolysis plastidome |
| CN106191927A (en) * | 2016-09-30 | 2016-12-07 | 河南科技大学 | A kind of low-temperature molten salt system used for aluminium electrolysis and using method thereof |
| CN108118366A (en) * | 2018-01-04 | 2018-06-05 | 昆明理工大学 | A kind of method of alumina dissolution speed in quickening aluminium cell |
-
2007
- 2007-12-17 CN CNA2007101796206A patent/CN101255574A/en active Pending
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101857961A (en) * | 2010-06-13 | 2010-10-13 | 中国铝业股份有限公司 | Method for reducing per-unit production energy consumption of aluminium electrolytic bath |
| CN102312252A (en) * | 2011-09-09 | 2012-01-11 | 东北大学 | Method for improving alumina dissolution rate in aluminium electrolysis process |
| CN102312252B (en) * | 2011-09-09 | 2013-11-13 | 东北大学 | Method for improving alumina dissolution rate in aluminium electrolysis process |
| 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 |
| CN103643259A (en) * | 2013-12-05 | 2014-03-19 | 东北大学 | Method for extracting metal and preparing oxygen from lunar soil/lunar rock mixed oxides |
| CN103643259B (en) * | 2013-12-05 | 2016-06-22 | 东北大学 | A kind of extract metal the method for preparing oxygen from lunar soil moon lithotype mixed oxide |
| CN103820818A (en) * | 2013-12-30 | 2014-05-28 | 中国神华能源股份有限公司 | Aluminum electrolysis plastidome for aluminum oxide electrolysis of one-step acid solution method production and application of aluminum electrolysis plastidome |
| CN103820818B (en) * | 2013-12-30 | 2017-02-08 | 中国神华能源股份有限公司 | Aluminum electrolysis plastidome for aluminum oxide electrolysis of one-step acid solution method production and application of aluminum electrolysis plastidome |
| CN106191927A (en) * | 2016-09-30 | 2016-12-07 | 河南科技大学 | A kind of low-temperature molten salt system used for aluminium electrolysis and using method thereof |
| CN106191927B (en) * | 2016-09-30 | 2017-11-24 | 河南科技大学 | A kind of low-temperature molten salt system used for aluminium electrolysis and its application method |
| CN108118366A (en) * | 2018-01-04 | 2018-06-05 | 昆明理工大学 | A kind of method of alumina dissolution speed in quickening aluminium cell |
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| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Open date: 20080903 |