CN1367274A - Method for preparing Al-Si alloy by AD-aluminite powder agent electrolytic process - Google Patents
Method for preparing Al-Si alloy by AD-aluminite powder agent electrolytic process Download PDFInfo
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- CN1367274A CN1367274A CN 01145089 CN01145089A CN1367274A CN 1367274 A CN1367274 A CN 1367274A CN 01145089 CN01145089 CN 01145089 CN 01145089 A CN01145089 A CN 01145089A CN 1367274 A CN1367274 A CN 1367274A
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Abstract
The present invention is characterized by that it adopts Na3AlF6 cryolite as electrolyte, the molecular ratir of cryolite in the electrolyte is about 2.3-3.0, and the temperature range of electrolyte is 950-990 deg.C, and AD-aluminium powder agent can be added to the electrolyte in batches. This invention possesses the following advantages: AD-aluminium powder agent-by-product produced in secondary aluminium plant can be circularly used, and its Al-Si alloy possesses higher aluminium content, and can be made into cast alumnium alloy.
Description
Technical Field
The invention relates to a method for producing aluminum-silicon multi-element alloy by electrolysis, belonging to the technical field of nonferrous metal and production.
Background
The aluminum-silicon alloy with high aluminum content can be used as a matrix of aluminum alloy and widely applied to the aluminum casting industry. The aluminum-silicon alloy with low aluminum content can be widely used as a deoxidizer in steel making. There are several methods for preparing AL-Si alloys at home and abroad: the heavy melting method-Al and Si are mixed and melted according to a certain proportion to prepare Al-Si alloy; smelting bauxite as a raw material into an AL-Si alloy in an ore smelting furnace; the Al-Si alloy is prepared by using an electric furnace method-AD aluminum powder agent as a raw material.
The re-dissolving method is actually secondary energy dissolving and refining, and has high cost; the ore heating furnace method is refined from natural bauxite, which often contains Ti metal, and the Ti content in the finished product is higher, so that the application of the finished product is limited; the electric furnace method is a large electric furnace with 1-6 ten thousand KWH, and the Al-Si alloy with high aluminum content is obtained, which is limited by equipment. In order to overcome the defects of the method, an electrolysis method of AD-aluminum powder is developed, and a technology for preparing AL-Si alloy is developed, namely the technology for preparing the AL-Si alloy by the method for electrolyzing the AD-aluminum powder is invented.
Disclosure of Invention
The invention is realized by the following steps: the electrolytic production process of Al-Si multicomponent alloy is characterized by that it uses AD-Al powder as raw material, and the AD-Al powder is made up by using the following components according to the weight percentage:
Al 4～16％Al2O355～85％
Si 1～10％ MgO 0.1～3％
CaO 0.1～3％ Fe2O30.1～2％
the raw materials are melted and electrolyzed in an electrolyte of a cryolite system to produce the aluminum-silicon multi-element alloy.
Principle of electrolysis
(a) Melting electrolysis
Anhydrous Al2O3The melting point is 2000 ℃ and the SiO melting point is 1713 ℃. But in Na3AlF6In cryolite, AlF3At 25% (cryolite molecular ratio of 3), AlO3Melting at about 1000 ℃ and AlF3At 37.5% (cryolite molecular ratio of 1.7), Al2O3Melting at about 725 ℃. Namely, the molecular ratio of the cryolite is changed, and the melting electrolysis temperature can be changed.
In the invention, the molecular ratio of cryolite is about 2.3-3.0, and the temperature range is 950-990 ℃.
(b) Electrode reaction of metals
The electrode potential sequence of the metal is Li, K, Ca, Na, Mg, Al, Si, Fe, H, Cu
During the electrolysis, the precipitation sequence is opposite to the above sequence, i.e. the precipitation sequence is
Cu，H，Fe，Si，Al，Mg，Na，Ca，K，Li，
(c) Electrolytic reaction
Cathode reaction
Anodic reaction
(d) Process parameters
The technological parameters during electrolysis are as follows:
the electrolyte temperature is 900-990 DEG C
Current A: 7A to 20A
Voltage V: 3.0V-5.0V
The invention has the advantages that the method recycles the byproduct AD aluminum powder produced in the recycled aluminum plant, and creates the effects of synergy and environmental protection for the recycled aluminum plant.
Another advantage of the present invention is that Al-Si alloys having higher aluminum contents than other Al-Si alloy manufacturing methods can be prepared and can be alloyed as cast aluminum to create higher economic benefits.
Detailed Description
In the following examples, laboratory data are illustrated, and in actual production, the weight of each component is scaled up, and the voltage and current values in actual production are based on the desired temperature.
Example 1
In an external-heat laboratory electrolyzer, molten salt electrolysis was carried out. 60g (parts) of AD-aluminum powder is added in batches. Adding 1.13g (1.13/60 parts) of AD-aluminum powder every 10 minutes, and after 40 minutes, adding 2.26g (2.26/60 parts) of AD-aluminum powder every 20 minutes; the technological parameters during electrolysis are the cryolite molecular ratio of 2.5, the electrolyte temperature of 965 ℃, the current intensity of 15A and the voltage of 3.8V. After 10 hours of electrolysis, 19.74g of an alloy was obtained. Analyzing Al-Si multicomponent components of a product, and according to the weight percentage: al 97.30%, Si 2.02%, Fe 0.55%.
Example 2
65 gA-aluminum powder was taken and subjected to molten salt electrolysis in an external laboratory electrolytic cell. The AD-aluminum powder was dosed in portions. 1.13g (1.13/65 parts) of AD-aluminum powder was initially added every 10 minutes, and after 60 minutes, 2.26g (2.26/65 parts) of AD-aluminum powder was added every 20 minutes. During electrolysis, the technological parameters are as follows:
cryolite molecular ratio: 2.7
Electrolyte temperature: 970 deg.C
Current intensity: 16A
Voltage: 4V
After 10 hours of electrolysis, 20.01g of an alloy was obtained. Analyzing the components of the Al-Si alloy product according to the weight percentage: 97.23% of Al, 2.12% of Si and 0.57% of Fe.
Example 3
In an addition laboratory, an electrolytic cell, molten salt electrolysis was performed. 68g of AD-aluminum powder is taken and put in batches. At the beginning, 1.13g (1.13/68 parts) of AD-aluminum powder was put in every 10 minutes, and after 80 minutes, 2.26g (2.26/68 parts) of AD-aluminum powder was put in every 20 minutes. The technological parameters during electrolysis are as follows:
cryolite molecular ratio of 2.8
Electrolyte temperature 980 deg.C
Current intensity 17A
Voltage 4.3V
After 10 hours of electrolysis, 20.04g of an alloy was obtained. Analyzing the components of the product AL-Si according to the weight percentage:
Al 97.37％， Si 2.08％， Fe 0.6％。
the examples demonstrate that: the method for electrolyzing AD-aluminum powder can obtain an alloy with about 90 percent of aluminum content when producing the AL-Si multi-element alloy, and the alloy can be used as a mother alloy for casting aluminum. When the Al-Si multi-element alloy is produced by the ore-smelting furnace method, only the Al-Si alloy with 30-40% of aluminum content can be obtained. When the Al-Si multi-element alloy is produced by an electric furnace method, only the Al-Si alloy with the aluminum content of 40-60% can be obtained. That is, Al-Si multi-element alloys produced by the ore-smelting and electric furnace methods are only used as deoxidizers in steel-making and are not used as master alloys for casting aluminum.
The method changes the by-product AD aluminum powder agent of a recycled aluminum plant into a good method, namely changes industrial by-products into mother alloy of cast aluminum with wide application, thereby achieving the purpose of increasing added value.
Claims (5)
1. A method for preparing AL-Si alloy by electrolyzing AD-aluminum powder is characterized in that Na is adopted3AlF6The cryolite is used as electrolyte, and the molecular ratio of the cryolite in the electrolyte is about 2.3-3.0; the temperature range of the electrolyte is 950-990 ℃.
2. The method for producing an AL-Si alloy according to claim 1, wherein the AD-aluminum powder is fed to the electrolyte in batches.
3. The method for preparing Al-Si alloy by electrolyzing AD-aluminum powder according to claim 1 or 2, wherein 60 parts of AD-aluminum powder is added in batches, 1.13/60 parts of AD-aluminum powder is added every 10 minutes, and after 40 minutes, 2.26/60 parts of AD-aluminum powder is added every 20 minutes; the technological parameters during electrolysis are the cryolite molecular ratio of 2.5 and the electrolyte temperature of 965 ℃.
4. The method for preparing Al-Si alloy by electrolyzing AD-aluminum powder according to claim 1 or 2, wherein 65 parts of AD-aluminum powder is added in batches, 1.13/65 parts of AD-aluminum powder is added every 10 minutes, and after 60 minutes, 2.26/65 parts of AD-aluminum powder is added every 20 minutes; the technological parameters during electrolysis are the cryolite molecular ratio of 2.7 and the electrolyte temperature of 970 ℃.
5. The method for preparing Al-Si alloy by electrolyzing AD-aluminum powder as recited in claim 1 or 2, wherein 68 parts of AD-aluminum powder is added in a batch, 1.13/68 parts of AD-aluminum powder is added every 10 minutes, and after 80 minutes, 2.26/68 parts of AD-aluminum powder is added every 20 minutes; the technological parameters during electrolysis are the cryolite molecular ratio of 2.8 and the electrolyte temperature of 980 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01145089 CN1367274A (en) | 2001-12-29 | 2001-12-29 | Method for preparing Al-Si alloy by AD-aluminite powder agent electrolytic process |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 01145089 CN1367274A (en) | 2001-12-29 | 2001-12-29 | Method for preparing Al-Si alloy by AD-aluminite powder agent electrolytic process |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103789796A (en) * | 2014-02-19 | 2014-05-14 | 郭龙 | Fly ash resource utilization method |
| RU2556188C1 (en) * | 2013-12-19 | 2015-07-10 | Федеральное Государственное Автономное Образовательное Учреждение Высшего Профессионального Образования "Сибирский Федеральный Университет" | Method for obtaining aluminium and silicon alloys in aluminium electrolysis units |
| CN105195749A (en) * | 2015-10-10 | 2015-12-30 | 江苏海光金属有限公司 | Production system for manufacturing AD powder through scrap aluminum |
| RU2599475C1 (en) * | 2015-06-03 | 2016-10-10 | Общество с ограниченной ответственностью "Безотходные и малоотходные технологии" (ООО "БМТ") | Method of producing aluminium-silicon alloy in electrolyzer for aluminium production |
-
2001
- 2001-12-29 CN CN 01145089 patent/CN1367274A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2556188C1 (en) * | 2013-12-19 | 2015-07-10 | Федеральное Государственное Автономное Образовательное Учреждение Высшего Профессионального Образования "Сибирский Федеральный Университет" | Method for obtaining aluminium and silicon alloys in aluminium electrolysis units |
| CN103789796A (en) * | 2014-02-19 | 2014-05-14 | 郭龙 | Fly ash resource utilization method |
| RU2599475C1 (en) * | 2015-06-03 | 2016-10-10 | Общество с ограниченной ответственностью "Безотходные и малоотходные технологии" (ООО "БМТ") | Method of producing aluminium-silicon alloy in electrolyzer for aluminium production |
| CN105195749A (en) * | 2015-10-10 | 2015-12-30 | 江苏海光金属有限公司 | Production system for manufacturing AD powder through scrap aluminum |
| CN105195749B (en) * | 2015-10-10 | 2017-05-17 | 江苏海光金属有限公司 | Production system for manufacturing AD powder through scrap aluminum |
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