CN101104942A - Thermal insulation coating material for aluminum electrolysis inertia anode preheating-replacing and preparation method thereof - Google Patents
Thermal insulation coating material for aluminum electrolysis inertia anode preheating-replacing and preparation method thereof Download PDFInfo
- Publication number
- CN101104942A CN101104942A CNA2007100348221A CN200710034822A CN101104942A CN 101104942 A CN101104942 A CN 101104942A CN A2007100348221 A CNA2007100348221 A CN A2007100348221A CN 200710034822 A CN200710034822 A CN 200710034822A CN 101104942 A CN101104942 A CN 101104942A
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- CN
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- Prior art keywords
- coating material
- inert anode
- thermal insulation
- insulation coating
- anode
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Links
- 239000000463 material Substances 0.000 title claims abstract description 40
- 238000009413 insulation Methods 0.000 title claims abstract description 39
- 239000011248 coating agent Substances 0.000 title claims abstract description 35
- 238000000576 coating method Methods 0.000 title claims abstract description 35
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 32
- 238000005868 electrolysis reaction Methods 0.000 title claims abstract description 21
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 20
- 238000002360 preparation method Methods 0.000 title claims abstract description 9
- 239000000203 mixture Substances 0.000 claims abstract description 17
- 238000001354 calcination Methods 0.000 claims abstract description 8
- 239000000470 constituent Substances 0.000 claims description 2
- 238000011049 filling Methods 0.000 claims description 2
- 150000004673 fluoride salts Chemical class 0.000 claims description 2
- 238000010438 heat treatment Methods 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 11
- 229910052593 corundum Inorganic materials 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 3
- 230000035939 shock Effects 0.000 abstract description 3
- 239000003792 electrolyte Substances 0.000 abstract description 2
- 238000002156 mixing Methods 0.000 abstract description 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
- 229910001845 yogo sapphire Inorganic materials 0.000 abstract 2
- 230000002411 adverse Effects 0.000 abstract 1
- 238000011109 contamination Methods 0.000 abstract 1
- 230000007797 corrosion Effects 0.000 abstract 1
- 238000005260 corrosion Methods 0.000 abstract 1
- 239000002994 raw material Substances 0.000 description 14
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 8
- 239000004411 aluminium Substances 0.000 description 8
- 229910052799 carbon Inorganic materials 0.000 description 7
- 229910004261 CaF 2 Inorganic materials 0.000 description 6
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical compound [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 description 5
- 241000209456 Plumbago Species 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 4
- 239000010431 corundum Substances 0.000 description 4
- 239000010439 graphite Substances 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 208000037656 Respiratory Sounds Diseases 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 229910044991 metal oxide Inorganic materials 0.000 description 2
- 150000004706 metal oxides Chemical class 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 238000005245 sintering Methods 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910001092 metal group alloy Inorganic materials 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Abstract
The invention provides a heat-insulating coating material for pre-treating and changing inert anode in aluminum electrolysis and the preparation method thereof. The components of the coating material and mass percentage of each component are as follows: Me3AlF6: 1-100 percent, Al2O3: 0-99 percent, Me'Fx: 0-40 percent. The preparation method comprises mixing Me3AlF6, Al2O3 and Me'Fx at the given ratio, placing an inert anode in a container, allowing the inert anode to be coated with the resulting mixture at a thickness above 2mm, and calcining for 0.5-40 hours at 300-1500 DEG C. The heat-insulating coating material provided in this invention is easy to detach from the anode after pre-treating and changing process and has no contamination or other adverse effect on the electrolyte, has excellent properties of heat insulation and coverage, and can efficiently avoid the damage and fault of inert anode due to heat shock, current shock and gas corrosion during the pre-treating and changing process.
Description
Technical field
The present invention is relevant with electrolysis of aluminum and used for aluminium electrolysis inert anode, particularly a kind of aluminum electrolysis inertia anode in process of production preheating-replacing with thermal insulation coating material and preparation method.
Background technology
The Hall-Heroul fused salt electrolysis process is unique now industrial metallurgy method for aluminum, uses inert anode to replace the trend that carbon anode is the aluminium electrolytic industry development.Because the electrolysis of aluminum high-temperature molten salt corrosive nature serious to material, the material that can satisfy the aluminum electrolysis inertia anode requirement mainly contains three kinds of metal or metal alloy, metal oxide and sintering metals.Except that metal or alloy, metal oxide and ceramic-metallic thermal shock resistance are all relatively poor.
The use of inert anode on aluminium cell, need at first adopt carbon anode that calcination is started, after the electrolyzer operation is normal, with inert anode carbon anode is changed again, made electrolytic cell operation carry out the transition to the inert anode electrolysis by the carbon annode electrolysis through preheating; In addition, in the inert anode electrolysis operational process, the inert anode after also needing to adopt inert anode after the new preheating to the operation certain hour is changed, to guarantee the smooth running of inert anode aluminium cell.In the preheating-replacing process, inert anode will stand powerful thermal shocking, rush of current and gas corrosive nature, very easily causes the anodic broken invalid.
Summary of the invention
The problem of broken invalid takes place during at inertia anode preheating-replacing easily, the invention provides a kind of aluminum electrolysis inertia anode that is used in the preheating-replacing process, reduce inert anode and be subjected to thermal insulation coating material of foreign impacts effect and preparation method thereof, utilize this thermal insulation coating material to help inert anode in the preheating-replacing process, avoid being subjected to intensive thermal shocking, rush of current and gas corrosive nature and cause broken invalid, realize the anodic preheating-replacing smoothly.
A kind of aluminum electrolysis inertia anode preheating-replacing thermal insulation coating material, its composition consists of: Me
3AlF
6-Al
2O
3-Me ' F
x, each constituent mass percentage composition is: 1～100%Me
3AlF
6, 0～99%Al
2O
3, 0～40%Me ' F
xMe
3AlF
6Be the fluoaluminate of Me, wherein Me is at least a among Na, K or the Li; Me ' F
xBe the fluoride salt of Me ', wherein Me ' is at least a among Al, Mg, Ca, Ba, Na, K or the Li.
A kind of aluminum electrolysis inertia anode preheating-replacing is with the preparation method of thermal insulation coating material, with component Me
3AlF
6, Al
2O
3And Me ' F
xBatching is mixed in proportion; This thermal insulation coating material at the above thickness of container bottom filling 2mm places inert anode or inert anode group (2 above inert anodes) in the container, keeps the above distance of 2mm with container side wall around inert anode or the inert anode group; Fill thermal insulation coating material in container, the inert anode top covers the above thermal insulation coating material of 2mm; The container that inert anode and thermal insulation coating material are housed is placed in the High Temperature Furnaces Heating Apparatus, calcined 0.5～40 hour, calcining temperature is 300～1500 ℃; Calcining finishes, and container is separated with inert anode, makes inert anode or inert anode group be coated with thermal insulation coating material.
The aluminum electrolysis inertia anode preheating-replacing thermal insulation coating material Me that the present invention proposes
3AlF
6-Al
2O
3-Me ' F
xRaw material form and can adjust according to the concrete composition of aluminium electrolyte, it is separated with anode behind preheating-replacing easily, can not pollute or other disadvantageous effect simultaneously ionogen; In thermal insulation coating material making processes, by adjusting various raw material compositions, tamped density, calcining temperature and calcination time, but sintering goes out to have the vesicular structure thermal insulation coating material of different porosities, make it have good insulation covering property, effectively avoid the inertia anode preheating-replacing process because thermal shocking, rush of current and gas corrosive nature and problems such as broken invalid.
Embodiment
Embodiment 1: a kind of Na
3AlF
6-Al
2O
3Thermal insulation coating material
Aluminum electrolysis inertia anode preheating-replacing Na
3AlF
6-Al
2O
3The composition of raw materials of thermal insulation coating material (by the quality percentage composition) is: 30%Na
3AlF
6, 70%Al
2O
3Two kinds of raw materials are mixed in proportion, fill mixed raw material in a plumbago crucible, making the thickness after its tamping is about 5mm, and inert anode is placed in the plumbago crucible, fill all around and the about 20mm of tamping mix after raw material; The plumbago crucible that inert anode is housed is placed in the resistance furnace, be raised to 1000 ℃ and be incubated 2 hours, behind the furnace cooling, plumbago crucible is removed, obtain being coated with Na with the speed of 2 ℃ of per minutes
3AlF
6-Al
2O
3Insulation coats the inert anode of material.
The inert anode that utilizes this thermal insulation coating material to coat, the rapid heat cycle circulation is 8 times under 1020 ℃ of temperature difference, and the inert anode profile is complete, crackle does not appear in the surface.Na
3AlF
6-Al
2O
3Thermal insulation coating material can be used for inert anode and contain Na in ionogen
3AlF
6And Al
2O
3Aluminium cell on preheating-replacing.
Embodiment 2: a kind of Na
3AlF
6-Li
3AlF
6-Al
2O
3-CaF
2Thermal insulation coating material
Aluminum electrolysis inertia anode preheating-replacing Na
3AlF
6-Li
3AlF
6-Al
2O
3-CaF
2The composition of raw materials of thermal insulation coating material (by the quality percentage composition) is: 20%Na
3AlNF
6, 5%Li
3AlF
6, 70%Al
2O
3, 5%CaF
2Above-mentioned four kinds of raw materials are mixed in proportion, in a steel crucibles, fill and mix the back raw material, making the thickness after its tamping is about 5mm, will place steel crucibles by the inert anode group that four inert anodes are formed, fill all around and the mixing of the about 15mm of tamping after raw material; The steel crucibles that the inert anode group is housed is placed in the resistance furnace, be raised to 950 ℃ and be incubated 5 hours, behind the furnace cooling, steel crucibles is removed, obtain being coated with the inert anode group that insulation coats material with the speed of 5 ℃ of per minutes.
Be coated with insulation and coat the inert anode group of expecting, the rapid heat cycle circulation is 12 times under 960 ℃ of temperature difference, and the inert anode profile is complete, crackle does not appear in the surface.This kind thermal insulation coating material can be used for inert anode and contains in ionogen maybe and can add Na
3AlF
6, Li
3AlF
6, Al
2O
3And CaF
2Aluminium cell on preheating-replacing.
Embodiment 3: a kind of Na
3AlF
6-K
3AlF
6-Al
2O
3-CaF
2-MgF
2Thermal insulation coating material
Aluminum electrolysis inertia anode preheating-replacing Na
3AlF
6-K
3AlF
6-Al
2O
3-CaF
2-MgF
2The composition of raw materials of thermal insulation coating material (by the quality percentage composition) is: 15%Na
3AlF
6, 10%K
3AlF
6, 65%Al
2O
3, 5%CaF
2, 5%MgF
2Above-mentioned five kinds of raw materials are mixed in proportion, fill to mix the back raw material in a corundum crucible, making the thickness after its tamping is about 10mm, and inert anode is placed in the corundum crucible, fill all around and the about 10mm of tamping mix after raw material; The corundum crucible that inert anode is housed is placed in the resistance furnace, be warmed up to 870 ℃ and be incubated 10 hours, behind the furnace cooling, corundum crucible is removed, obtain being coated with the inert anode that insulation coats material with the speed of 2 ℃ of per minutes.
Be coated with insulation and coat the inert anode of expecting, the rapid heat cycle circulation is 20 times under 900 ℃ of temperature difference, and the inert anode profile is complete, crackle does not appear in the surface.This kind thermal insulation coating material can be used for inert anode and contains in ionogen maybe and can add Na
3AlF
6, K
3AlF
6, Al
2O
3, CaF
2And MgF
2Aluminium cell on preheating-replacing.
Claims (3)
1. an aluminum electrolysis inertia anode preheating one is changed and is used thermal insulation coating material, and it is characterized in that: composition consists of: Me
3AlF
6-Al
2O
3-Me ' F
x, each constituent mass percentage composition is: 1～100%Me
3AlF
6, 0～99%Al
2O
3, 0～40%Me ' F
xMe
3AlF
6Be the fluoaluminate of Me, wherein Me is at least a among Na, K or the Li; Me ' F
xBe the fluoride salt of Me ', wherein Me ' is at least a among Al, Mg, Ca, Ba, Na, K or the Li.
2. the preparation method that aluminum electrolysis inertia anode preheating one is changed with thermal insulation coating material is characterized in that: with component Me
3AlF
6, Al
2O
3And Me ' F
xIn the described ratio batching of claim 1, mix; Thermal insulation coating material at the above thickness of container bottom filling 2mm places inert anode in the container, keeps the above distance of 2mm with container side wall around the inert anode; Fill thermal insulation coating material in container, the inert anode top covers the above thermal insulation coating material of 2mm; The container that inert anode and thermal insulation coating material are housed is placed in the High Temperature Furnaces Heating Apparatus, calcined 0.5～40 hour, calcining temperature is 300～1500 ℃; Calcining finishes, and container is separated with inert anode, makes inert anode be coated with thermal insulation coating material.
3. preparation method according to claim 2 is characterized in that: described inert anode is the inert anode group, i.e. 2 and above inert anode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200710034822A CN100582309C (en) | 2007-04-26 | 2007-04-26 | Thermal insulation coating material for aluminum electrolysis inertia anode preheating-replacing and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200710034822A CN100582309C (en) | 2007-04-26 | 2007-04-26 | Thermal insulation coating material for aluminum electrolysis inertia anode preheating-replacing and preparation method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101104942A true CN101104942A (en) | 2008-01-16 |
| CN100582309C CN100582309C (en) | 2010-01-20 |
Family
ID=38999017
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200710034822A Expired - Fee Related CN100582309C (en) | 2007-04-26 | 2007-04-26 | Thermal insulation coating material for aluminum electrolysis inertia anode preheating-replacing and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100582309C (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101942677A (en) * | 2010-09-30 | 2011-01-12 | 中南大学 | Heat-insulating coating material for aluminum electrolytic inert anode and use thereof |
| CN103160860A (en) * | 2011-12-14 | 2013-06-19 | 中铝国际技术发展有限公司 | Method for covering prebaked anodes in aluminum electrolyzer |
| CN104451776B (en) * | 2013-09-13 | 2017-02-01 | 湖南创元铝业有限公司 | Anode ledge elimination agent and use method thereof |
| CN106498443A (en) * | 2016-10-17 | 2017-03-15 | 昌吉州准东经济技术开发区唯新能源科技有限公司 | Carbon anode heat-preserving cover plate and preparation method thereof and using method |
| CN106894051A (en) * | 2017-01-23 | 2017-06-27 | 中南大学 | A kind of preparation of aluminium cell artificial hearth material and described artificial hearth |
-
2007
- 2007-04-26 CN CN200710034822A patent/CN100582309C/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101942677A (en) * | 2010-09-30 | 2011-01-12 | 中南大学 | Heat-insulating coating material for aluminum electrolytic inert anode and use thereof |
| CN103160860A (en) * | 2011-12-14 | 2013-06-19 | 中铝国际技术发展有限公司 | Method for covering prebaked anodes in aluminum electrolyzer |
| CN104451776B (en) * | 2013-09-13 | 2017-02-01 | 湖南创元铝业有限公司 | Anode ledge elimination agent and use method thereof |
| CN106498443A (en) * | 2016-10-17 | 2017-03-15 | 昌吉州准东经济技术开发区唯新能源科技有限公司 | Carbon anode heat-preserving cover plate and preparation method thereof and using method |
| CN106498443B (en) * | 2016-10-17 | 2018-10-12 | 昌吉州准东经济技术开发区唯新能源科技有限公司 | Carbon anode heat-preserving cover plate and preparation method thereof and application method |
| CN106894051A (en) * | 2017-01-23 | 2017-06-27 | 中南大学 | A kind of preparation of aluminium cell artificial hearth material and described artificial hearth |
| CN106894051B (en) * | 2017-01-23 | 2019-03-26 | 中南大学 | A kind of preparation of aluminium cell artificial hearth material and the artificial hearth |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100582309C (en) | 2010-01-20 |
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Granted publication date: 20100120 Termination date: 20130426 |