CN1546733A - Method for producing refined aluminum by cryolite-alumina fused salt electrolysis process - Google Patents
Method for producing refined aluminum by cryolite-alumina fused salt electrolysis process Download PDFInfo
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- CN1546733A CN1546733A CNA2003101200929A CN200310120092A CN1546733A CN 1546733 A CN1546733 A CN 1546733A CN A2003101200929 A CNA2003101200929 A CN A2003101200929A CN 200310120092 A CN200310120092 A CN 200310120092A CN 1546733 A CN1546733 A CN 1546733A
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Abstract
The invention relates to a method for producing refined aluminum by cryolite-alumina fused salt electrolysis process by using aluminium cell as the principal equipment, using alumina as raw material, using cryolite and alumina as molten salt, applying continuous current to the two electrodes of the electrolytic tank, separating out anodic gas containing impurity on the anode, entering flue gas clarification system for removal, and obtaining refined aluminum on the cathode.
Description
One, technical field:
The invention belongs to the aluminium reduction process field of production, relate to a kind of sodium aluminum fluoride of using specifically---the alumina molten salt electrolysis method is produced the method for refined aluminium.
Two, background technology:
External method of producing refined aluminium has three layers of liquid electrolytic process and segregation method; The method of domestic production refined aluminium has only three layers of liquid electrolytic process, equipment used is three layers of liquid electrolyzer, negative electrode is the refined aluminium layer at upper part of the electrolytic cell, the middle layer is fluorochemical and muriatic fused salt, and anode is aluminum bronze (40%) alloy layer in the electrolyzer bottom, and three layers of liquid electrolytic process are to do raw material with metallic aluminium, produce refined aluminium through re-electrolysis, consumed power is big, and ton aluminium power consumption is about 16000 degree, the cost height; Segregation method also is to do raw material with metallic aluminium, is to utilize the different solubility of impurity element in solid aluminium and liquid aluminium, produces segregation and obtain refined aluminium when the molten aluminium condensation, power consumption is little, ton aluminium power consumption is about 600 degree, but the raw material consumption height, makes 30% aluminium will become the aluminium of high impurity content.Three layers of liquid electrolytic process are that metallic aluminium is joined in the aluminum-copper alloy by charging opening, float to the refined aluminium cathode layer on the refined aluminium that the process electrolysis production goes out, electrolysis goes out behind a certain amount of refined aluminium with going out the sucking-off of aluminium bag, carry out ingot casting, electrolysis through certain hour, impurity element enrichment in the aluminum bronze master alloy needs the periodic replacement aluminum-copper alloy, and the fused salt of aluminum fluoride and bariumchloride needs to add the refined aluminium electrolyzer again after female groove electrolysis (refining); The raw material that segregation method adopts also is the metallic aluminium that the once electrolytic method is produced, and produces refined aluminium through the segregation stove again.The present invention adopts two layers of liquid electrolyzer, negative electrode is the refined aluminium layer in the electrolyzer bottom, top is sodium aluminum fluoride---the alumina molten salt layer, anode is a carbon product, the raw material that the present invention adopts is an aluminum oxide, produces refined aluminium through once electrolytic, about ton aluminium power consumption 14000 degree, three kinds of methods of producing refined aluminium are compared, best results of the present invention.
Three, summary of the invention:
The present invention adopts direct current by electrolyzer negative and positive the two poles of the earth, uses sodium aluminum fluoride---and the alumina molten salt electrolysis method is produced the method for refined aluminium, to overcome above-mentioned deficiency.
The objective of the invention is to realize by following technical scheme:
A kind of sodium aluminum fluoride of using---alumina molten salt electrolysis method is produced the method for refined aluminium, and its characteristics are: the method for producing refined aluminium is as follows:
(1) in an electrolysis flue gas purification system, selects in the system 25% electrolyzer as the electrolyzer of producing refined aluminium, because the refined aluminium electrolyzer selects too much will influence the decontamination effect improving of flue gas;
(2) the refined aluminium electrolyzer evaporates impurity element in electrolytic process, enters flue gas purification system with electrolysis flue gas; Purify the fluorinated alumina that contains impurity that reclaims and to enter the refined aluminium electrolyzer;
(3) the refined aluminium electrolyzer is raw materials used is aluminum oxide, and its purity is not less than 98.8%, and used anode is not for adding the carbon anode of anode scrap, and its ash is not more than 0.35%;
(4) the used electrolyte melt of electrolyte melt of refined aluminium electrolyzer for purifying, this melt is that female groove provides by other electrolyzer;
When (5) the refined aluminium electrolyzer is changed anode, the anode scrap that more swaps out is that aluminum oxide crust and the anode aluminum oxide crust all around above the old anode can not be used for the refined aluminium electrolyzer, and new anode after the replacing and aluminium oxide shell face purity all around are that the aluminum oxide more than 98.8% covers;
(6) the electrolysis temperature 940-960 of refined aluminium electrolyzer ℃, the horizontal 18-22cm of fused salt, aluminum liquid horizontal 18-22cm, electrolyte molecule are than 2.2-2.8, groove operating voltage 4.1-4.4V;
(7) refined aluminium produced of refined aluminium electrolyzer goes out the aluminium bag with special use and draws, and pours the special-purpose molten stove of practicing then into, with nitrogen or chlorine blowing 15 minutes, carries out the refined aluminium ingot casting.
Adopting sodium aluminum fluoride of the present invention---alumina molten salt electrolysis method direct production goes out a kind of method that aluminium content is 99.93% above refined aluminium, this method equipment used is an aluminium cell, raw material is an aluminium sesquioxide, fused salt is sodium aluminum fluoride and aluminum oxide, this method is negative and positive the two poles of the earth that direct current passes through electrolyzer, on anode, separate out the anodic gas that contains impurity, and enter the flue gas purification system eliminating; On negative electrode, produce required refined aluminium.At present this method is not at home, abroad appear in the newspapers.This method is used on my industrial cell, and the purity of aluminium has reached more than 99.95%, and present method is to do raw material with aluminum oxide, produces refined aluminium through once electrolytic, and energy consumption and cost are well below other method.
Four, description of drawings:
Fig. 1 is the production method structural representation that three layers of liquid electrolytic process of prior art are produced refined aluminium;
Fig. 2 is a sodium aluminum fluoride of the present invention---the alumina molten salt electrolysis method is produced the production method structural representation of refined aluminium.
Five, embodiment:
Embodiment:
The present invention uses sodium aluminum fluoride as shown in Figure 2---and the alumina molten salt electrolysis method is produced the method for refined aluminium, and its characteristics are: the method for producing refined aluminium is as follows:
(1) in an electrolysis flue gas purification system, selects in the system 25% electrolyzer as the electrolyzer of producing refined aluminium, because the refined aluminium electrolyzer selects too much will influence the decontamination effect improving of flue gas;
(2) the refined aluminium electrolyzer evaporates impurity element in electrolytic process, enters flue gas purification system with electrolysis flue gas; Purify the fluorinated alumina that contains impurity that reclaims and to enter the refined aluminium electrolyzer;
(3) the refined aluminium electrolyzer is raw materials used is aluminum oxide, and its purity is not less than 98.8%, and used anode is not for adding the carbon anode of anode scrap, and its ash is not more than 0.35%;
(4) the used electrolyte melt of electrolyte melt of refined aluminium electrolyzer for purifying, this melt is that female groove provides by other electrolyzer;
When (5) the refined aluminium electrolyzer is changed anode, the anode scrap that more swaps out is that aluminum oxide crust and the anode aluminum oxide crust all around above the old anode can not be used for the refined aluminium electrolyzer, and new anode after the replacing and aluminium oxide shell face purity all around are that the aluminum oxide more than 98.8% covers;
(6) the electrolysis temperature 940-960 of refined aluminium electrolyzer ℃, the horizontal 18-22cm of fused salt, aluminum liquid horizontal 18-22cm, electrolyte molecule are than 2.2-2.8, groove operating voltage 4.1-4.4V;
(7) refined aluminium produced of refined aluminium electrolyzer goes out the aluminium bag with special use and draws, and pours the special-purpose molten stove of practicing then into, with nitrogen or chlorine blowing 15 minutes, carries out the refined aluminium ingot casting.
The anode of sodium aluminum fluoride---alumina molten salt electrolysis method is that ash is not more than 0.35% carbon anode, raw materials used is the aluminum oxide of purity 98.8%, directly being added to sodium aluminum fluoride from upper part of the electrolytic cell---the alumina melt (refining in female groove earlier of this solution), the refined aluminium that the process electrolysis production goes out is heavy to be collected in the refined aluminium cathode layer.
For example: the aluminium cell of 100 60KA of a flue gas purification system band, select 25 electrolyzers as the electrolyzer of producing refined aluminium, be called for short refined aluminum groove.The flue gas that these 25 refined aluminum grooves produce and the impurity of evaporation all enter flue gas purification system, fluorinated alumina in the purification system is used by other 75 platform trough, these 25 refined aluminum grooves are aluminum oxide more than 98.8% and ash less than 0.3% carbon anode with purity all, the sodium aluminum fluoride that uses---aluminum oxide solution is provided through after the refining by other 75 electrolyzers, when changing anode to refined aluminum groove, above the carbon anode that swaps out and aluminum oxide all around crust, all supply with other 75 electrolyzers and use, the anode that newly changes is not less than 98.80% aluminum oxide with purity and is incubated covering.The technical qualification of this 25 platform trough are pressed groove operating voltage 4.1-4.5V, electrolysis temperature 940-960 ℃, molecular ratio 2.2-2.8, the horizontal 18-22cm of fused salt, aluminum liquid horizontal 18-22cm and are kept, the refined aluminium of producing goes out aluminium bag (liner is the mould material or the refractory brick of alumina content about 90%) and special furnace (liner is the mould material or the refractory brick of alumina content about 90%) and carried out nitrogen or chlorine treatment 15 minutes with special-purpose, enter ingot casting then, can produce about 4000 tons of refined aluminiums the whole year.
Claims (1)
1, a kind of sodium aluminum fluoride of using---alumina molten salt electrolysis method is produced the method for refined aluminium, it is characterized in that: the method for producing refined aluminium is as follows:
(1) in an electrolysis flue gas purification system, selects in the system 25% electrolyzer as the electrolyzer of producing refined aluminium, because the refined aluminium electrolyzer selects too much will influence the decontamination effect improving of flue gas;
(2) the refined aluminium electrolyzer evaporates impurity element in electrolytic process, enters flue gas purification system with electrolysis flue gas; Purify the fluorinated alumina that contains impurity that reclaims and to enter the refined aluminium electrolyzer;
(3) the refined aluminium electrolyzer is raw materials used is aluminum oxide, and its purity is not less than 98.8%, and used anode is not for adding the carbon anode of anode scrap, and its ash is not more than 0.35%;
(4) the used electrolyte melt of electrolyte melt of refined aluminium electrolyzer for purifying, this melt is that female groove provides by other electrolyzer;
When (5) the refined aluminium electrolyzer is changed anode, the anode scrap that more swaps out is that aluminum oxide crust and the anode aluminum oxide crust all around above the old anode can not be used for the refined aluminium electrolyzer, and new anode after the replacing and aluminium oxide shell face purity all around are that the aluminum oxide more than 98.8% covers;
(6) the electrolysis temperature 940-960 of refined aluminium electrolyzer ℃, the horizontal 18-22cm of fused salt, aluminum liquid horizontal 18-22cm, electrolyte molecule are than 2.2-2.8, groove operating voltage 4.1-4.4V;
(7) refined aluminium produced of refined aluminium electrolyzer goes out the aluminium bag with special use and draws, and pours the special-purpose molten stove of practicing then into, with nitrogen or chlorine blowing 15 minutes, carries out the refined aluminium ingot casting.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2003101200929A CN1332069C (en) | 2003-12-06 | 2003-12-06 | Method for producing refined aluminum by cryolite-alumina fused salt electrolysis process |
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| CNB2003101200929A CN1332069C (en) | 2003-12-06 | 2003-12-06 | Method for producing refined aluminum by cryolite-alumina fused salt electrolysis process |
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| CN1546733A true CN1546733A (en) | 2004-11-17 |
| CN1332069C CN1332069C (en) | 2007-08-15 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1333095C (en) * | 2005-04-07 | 2007-08-22 | 郑州大学 | Fine grained aluminum ingot and method for manufacturing the same |
| CN107630251A (en) * | 2017-09-18 | 2018-01-26 | 成都云津能源科技有限公司 | Method, aluminium ash, aluminium slag ash recovery and treatment method and the electrolytic cell of fused salt electrolysis process conversion aluminium nitride |
| CN109023423A (en) * | 2018-07-17 | 2018-12-18 | 甘肃东兴铝业有限公司 | A kind of method of 500kA aluminium cell production high-quality Al99.90 product |
| CN115849419A (en) * | 2022-11-22 | 2023-03-28 | 贵州大学 | Production method of fluorine-carrying alumina and application of produced fluorine-carrying alumina |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4072599A (en) * | 1975-08-28 | 1978-02-07 | Reynolds Metals Company | Carbon electrodes having stabilized binders derived from the entire organic fraction of bituminous coal |
| US4465659A (en) * | 1982-07-21 | 1984-08-14 | Atlantic Richfield Company | Aluminum production via the chlorination of partially calcined aluminum chloride hexahydrate |
| FR2600675B1 (en) * | 1986-06-24 | 1988-08-26 | Pechiney Aluminium | METHOD FOR ADJUSTING THE PIT CONTENT OF ANODES FOR THE PRODUCTION OF ALUMINUM BY ELECTROLYSIS |
| CN1128303A (en) * | 1994-12-21 | 1996-08-07 | 包头铝厂 | Self-baking aluminum electrolytic decontamination process |
| US6217739B1 (en) * | 1997-06-26 | 2001-04-17 | Alcoa Inc. | Electrolytic production of high purity aluminum using inert anodes |
| JP3758501B2 (en) * | 1998-12-17 | 2006-03-22 | 日本軽金属株式会社 | Manufacturing method of high purity aluminum primary metal |
| DE29919223U1 (en) * | 1999-11-02 | 2000-02-24 | Vaw Highpural Gmbh | Device for extracting pure aluminum |
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2003
- 2003-12-06 CN CNB2003101200929A patent/CN1332069C/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1333095C (en) * | 2005-04-07 | 2007-08-22 | 郑州大学 | Fine grained aluminum ingot and method for manufacturing the same |
| CN107630251A (en) * | 2017-09-18 | 2018-01-26 | 成都云津能源科技有限公司 | Method, aluminium ash, aluminium slag ash recovery and treatment method and the electrolytic cell of fused salt electrolysis process conversion aluminium nitride |
| CN109023423A (en) * | 2018-07-17 | 2018-12-18 | 甘肃东兴铝业有限公司 | A kind of method of 500kA aluminium cell production high-quality Al99.90 product |
| CN115849419A (en) * | 2022-11-22 | 2023-03-28 | 贵州大学 | Production method of fluorine-carrying alumina and application of produced fluorine-carrying alumina |
| CN115849419B (en) * | 2022-11-22 | 2024-03-29 | 贵州大学 | Production method of fluorine-carrying alumina and application of fluorine-carrying alumina produced by production method |
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| CN1332069C (en) | 2007-08-15 |
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