CN107868877B - Method for preparing aluminum-scandium alloy by adopting segmented countercurrent reduction method - Google Patents
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Abstract
The invention discloses methods for preparing aluminum-scandium alloy by adopting a segmented countercurrent reduction method, wherein the whole reaction process is divided into multiple segments, a scandium-containing alloy and a scandium-containing raw material (slag phase or molten salt) move in reverse directions in the whole process, the scandium-containing raw material is ensured to be used for reducing the alloy with high scandium content, the scandium-containing raw material is used for reducing the alloy with low scandium content, an alloy material meeting the requirement on scandium content can be obtained in aspect, and the scandium content in the finally-discarded slag (or molten salt) can be reduced to the maximum extent in aspect, so that the actual yield of scandium is greatly improved.
Description
Technical Field
The invention relates to a method for preparing an aluminum-scandium alloy, in particular to methods for preparing the aluminum-scandium alloy by adopting a segmented countercurrent reduction method.
Background
Scandium (Sc) is soft and silvery transition metals, the yield is low, the content of scandium in the earth crust is about 0.0005%, scandium is the most effective known aluminum alloy grain refiner, only a small amount of Sc (usually 0.2%) needs to be added into the aluminum alloy, the strength, the heat resistance, the weldability, the stress corrosion resistance and the like of the alloy can be greatly improved, and the scandium (Sc) has an application prospect of in the high and new technical fields of ships, aviation and aerospace industries, rockets, missiles, nuclear energy and the like, but the scandium resource is rare, the prices of scandium and scandium compounds are too high (the price of scandium oxide is about 6000 yuan/kg at present, and the price of an aluminum-scandium alloy containing 2% is about 400 yuan/kg at present), so that the large-scale application of the aluminum-scandium alloy is further hindered by .
The research on Al-Sc alloy began in the 70 th century, and scholars at home and abroad made a lot of research work. Although scandium resources are abundant in China and are export countries of primary scandium oxide products, the preparation technology of the Al-Sc intermediate alloy is relatively lagged behind, the production cost is high, and the development of scandium-aluminum alloy is severely restricted.
At present, the preparation method of the Al-Sc alloy mainly comprises a melting and matching method, a molten salt electrolysis method, a vacuum thermal reduction method, a non-vacuum aluminothermal reduction method, a non-vacuum aluminum magnesium thermal reduction method and the like. Specifically, the method comprises the following steps:
1. preparation of Al-Sc intermediate alloy by smelting compounding method
The melting and matching method is a traditional method for preparing Al-Sc intermediate alloy, wherein high-purity metal scandium is wrapped by aluminum foil in a certain proportion, then is mixed into molten aluminum liquid under the protection of argon, is kept warm for enough time, and is cast into an iron mold or a water-cooling copper mold after being fully stirred to prepare the Al-Sc intermediate alloy.
2. Preparation of Al-Sc intermediate alloy by fused salt electrolysis
ScCl taken by Sun Bengood et al of northeast university3the-KCl-NaCl molten salt system is an electrolyte, and electrolysis is carried out in a corundum crucible at the temperature of 750-900 ℃ and the current density is 0.6-1.0A/cm2ScCl in electrolyte3The concentration of the alloy is 20-40%, the Sc content in the alloy can reach 8%, and the current efficiency can reach 85%.
Zhengzhou university (Zhengzhou light metal institute) Yanghe et al use nNaF-AlF3-Al2O3-Sc2O3The molten salt system is an electrolyte, and the electrolysis is carried out in a graphite crucible at 950 ℃ with the current density of 0.6-1.0A/cm2The Sc content in the alloy can reach 3 percent, and the current efficiency can reach 90 percent.
In practical production, if a small electrolytic cell is adopted, the method has low current efficiency, the product is easy to be polluted, and the product quality is difficult to ensure; if a large-sized electrolytic cell is adopted, the problem that the capacity is too large and cannot be matched with the demand is caused.
3. Vacuum aluminothermic process
The method takes scandium fluoride as a raw material and active aluminum powder as a reducing agent to carry out reduction under the vacuum condition of 900 ℃. ScF3The conversion efficiency of (a) is about 90%. The method can also adopt a three-stage heating mode, the maximum temperature is 1300 ℃, and ScF3The conversion efficiency of (A) can reach 96%. However, the method has the main problems of complicated equipment, high reduction temperature, serious corrosion of fluoride to the equipment and environmental pollution caused by gaseous fluoride.
4. Non-vacuum aluminothermic reduction process
60 nNaF. AlF by people on the great school road in northeast3Reduction of Sc with Al in the-20 KCl-20NaCl System2O3And reducing for 120min at 820 ℃, wherein the scandium content of the alloy can reach 1%, and the yield is less than 80%.
Powdery Sc of Hunan rare earth metal institute2O3The Al-Sc alloy is reduced into Al-Sc alloy at high temperature by using molten Al liquid as a reducing agent and NaCl, KCl and special additives as slag formers.
The biggest problem of the method is that the yield of scandium is low and is only less than 80%.
5. Non-vacuum thermal reduction method of Al-Mg (Ca, Na, Sr)
Sc is more active than Al, and in order to prepare the aluminum-scandium alloy with scandium content meeting the requirement through reduction, more residual scandium compounds in the reduction slag are needed, so that the recovery rate of scandium is not high. The addition of active metals such as magnesium, calcium, strontium, sodium and the like to aluminum can greatly reduce the scandium content in the slag, reduce the loss and improve the yield, but the residual elements such as magnesium, calcium and the like in the alloy limit the application range of the aluminum-scandium master alloy, and can not be used in the occasions strictly limiting the elements.
In the method, a non-vacuum aluminothermic reduction method or an aluminum-magnesium alloy reduction method is a main aluminum-scandium alloy preparation method at present, but the yield of scandium in the aluminothermic reduction method is low, and the application range of products obtained by the aluminum-magnesium alloy reduction method is limited.
Disclosure of Invention
The invention aims to provide methods for preparing aluminum-scandium alloy by adopting a segmented countercurrent reduction method aiming at the defects of the existing preparation method of Al-Sc alloy.
In order to achieve the purpose, the invention can adopt the following technical scheme:
the method for preparing the aluminum-scandium alloy by adopting the segmented countercurrent reduction method has the advantages that the whole reaction process is divided into multiple segments:
initial stage reaction: reacting pure aluminum or aluminum alloy raw material with a proper amount of scandium-containing raw material to obtain low scandium-containing alloy and a slag phase (or molten salt); the low scandium content alloy is reserved for standby, and the slag phase (or molten salt) is discarded;
a second stage of reaction, namely taking the alloy with low scandium content obtained by the primary stage reaction as a main material, adding a proper amount of scandium-containing raw material for reaction, taking the obtained scandium-containing alloy as a main material for the next -stage reaction, and remaining the obtained scandium-containing slag material (or molten salt) as the scandium-containing raw material of the primary stage reaction;
and (2) carrying out a final-stage reaction after the plurality of stages of reactions, wherein the final-stage reaction adopts scandium-containing alloy obtained by the upper -stage reaction as a main material to carry out a final reaction with a newly added scandium-containing raw material, the obtained aluminum-scandium alloy is a final product, and the obtained residual scandium-containing slag material (or molten salt) is used as the scandium-containing raw material of the upper -stage reaction.
The whole reaction process has at least two sections, and can also have three sections, four sections or more.
The aluminum alloy raw materials used in the initial stage reaction are aluminum magnesium and aluminum calcium alloy.
The scandium-containing raw material used in the invention is scandium oxide, chloride, fluoride or molten salt composed of scandium compound and chloride or/and fluoride.
The traditional times reduction reaction is divided into multiple stages to be carried out, in the whole reaction process, the scandium-containing alloy and the scandium-containing raw material (slag phase or molten salt) move reversely in the whole process, the scandium-containing raw material is ensured to be used for reducing the alloy with high scandium content, the scandium-containing raw material is used for reducing the alloy with low scandium content, the alloy material meeting the requirement on scandium content can be obtained in aspect, in addition, in aspect, the scandium content in the final waste slag (or molten salt) can be reduced to the maximum extent, so that the actual yield of scandium is greatly improved.
Drawings
FIG. 1 is a reaction scheme of an embodiment of the present invention.
Detailed Description
the present invention will be described in more detail below by taking a three-stage reaction as an example.
As shown in fig. 1, the whole reaction process of the method for preparing aluminum-scandium alloy by using the segmented countercurrent reduction method of the present invention is divided into three segments:
initial stage reaction: adopting pure aluminum or aluminum alloy (aluminum magnesium, aluminum calcium and the like) raw materials to react with scandium-containing slag (or molten salt) of the second-stage reaction (if the primary production is carried out, when no two-stage slag (or molten salt) exists, adding a proper amount of scandium-containing raw materials such as scandium oxide, chloride, fluoride or a mixture thereof, or a molten salt consisting of a scandium compound and chloride or/and fluoride), continuously carrying out the second-stage reduction on the obtained low-scandium-containing alloy, and taking the obtained slag phase (or molten salt) as waste slag to be discarded;
and (3) second-stage reaction: carrying out reduction reaction on the low scandium content alloy obtained by the primary reaction and scandium-containing slag (or molten salt) obtained by the third-stage reaction (if the primary production is carried out, when three-stage scandium-containing slag (or molten salt) is not available, a proper amount of scandium-containing raw material can be added, and the scandium-containing raw material is as described above), wherein scandium-containing alloy (with higher scandium content than the primary reaction) obtained by the second-stage reaction is used as raw material for the third-stage reaction, and scandium-containing slag or molten salt (with same scandium content as the primary reaction) obtained by the second-stage reaction is used as scandium-containing raw material and is fed into the primary reaction;
and (3) third stage reaction: and (3) taking the scandium-containing alloy obtained in the second stage as a reaction raw material, reacting with a newly added scandium-containing raw material to obtain an aluminum-scandium alloy (with scandium content meeting the requirement) as a final product, and feeding residual scandium-containing slag or molten salt (with higher scandium content) as a scandium-containing raw material to the second stage reaction.
Secondly, the reaction principle of the invention is as follows:
the reduction process due to the aluminothermic reduction method can be represented by the following reaction formula:
Al + Sc3+= Sc + Al3+
since Sc is more active than Al, to produce Al-Sc alloy with a certain Sc content, the residual Sc content in the slag phase (or molten salt) after reaction is required3+Thus causing a loss of Sc. Meanwhile, the higher the Sc content in the alloy, the more Sc remaining in the slag (or molten salt)3+The higher the content, the higher the yield of ScLow. And the increase of Sc content in the alloy and the balance Sc3+The increase in content is not a linear but an exponential relationship, so the Sc yield is very sensitive to the Sc content of the alloy.
Further studies by Yangtze et al on the relationship between the oxide content in cryolite-based molten salt electrolyte and the Sc content in the alloy during electrolysis show that the relationship is in accordance with the following formula:
in the formula: n is a radical ofSc-concentration of scandium in the alloy;
NSc2O3-concentration of scandium oxide in the electrolyte;
NAl2O3-concentration of alumina in the electrolyte.
Since the thermodynamic conditions of the electroreduction process and the chemical reduction process are similar, it can be considered that the aluminothermic reduction process also has a proportional relationship similar to the above relationship.
From this fact, it is considered that when the scandium content in the aluminum-scandium alloy is low, Sc in the slag (or molten salt) in equilibrium with Sc3+The content is greatly reduced, and the yield of scandium can be greatly improved.
Third, comparison of specific examples:
example 1:
1. adopts the traditional non-vacuum aluminothermic reduction method to prepare the product with Sc2O3Taking molten Al liquid as a reducing agent, adding a smelting aid, and reducing the Al-Sc alloy containing 2% of scandium at high temperature. The yield of the method is not more than 80 percent according to the prior Sc2O3The cost is 6000 yuan/kg, the raw material cost of each ton of alloy is about 24.7 ten thousand yuan (about 38.33 kg scandium oxide and 1000 kg aluminum), the cost of the reduction smelting process (auxiliary agents, energy sources, labor and equipment depreciation and the like) is about 1000 yuan/t, and the total production cost of the alloy is about 24.8 ten thousand yuan/t.
2. The non-vacuum aluminothermic reduction method is also adopted, and the reduction process is carried out by adopting the three-stage method: pure aluminum is used as the initial metal, and scandium source is used as the initial metalWith Sc2O3. The reaction process is as follows: mixing liquid pure aluminum and reaction slag generated by the second-stage reaction in the first-stage reaction (in the first production, because no second-stage slag is generated, a proper amount of scandium oxide and a smelting auxiliary agent can be used for replacing the second-stage slag), removing the reaction slag after the reaction is finished, adding the reaction slag generated by the third-stage reaction (in the first production, because no third-stage slag is generated, a proper amount of scandium oxide and a smelting auxiliary agent can be used for replacing the third-stage slag) to perform the second-stage reaction, separating the reaction slag after the reaction is finished, reserving the reaction slag as a first-stage reaction raw material, and adding a proper amount of Sc into the2O3The raw materials and the smelting auxiliary agent are subjected to three-stage (final stage) reaction, after the reaction is finished, reaction slag is separated and reserved as a second-stage reaction raw material, and the alloy is refined and cast into a product.
The three-stage reaction is adopted, the final stage reaction is the same as that of the traditional non-vacuum aluminothermic reduction method, theoretically the same scandium yield (80%) can be obtained, the reaction conditions can be relaxed, the scandium yield is calculated conservatively according to 70%, the scandium content in the alloy generated by the two-stage reaction is lower, the scandium oxide content in the slag phase balanced with the scandium content is also very low, the high recovery rate can be obtained, the scandium yield is calculated according to 70%, the scandium content in the alloy generated by the initial stage reaction is lower, is controlled below 0.1% generally, the scandium oxide in the slag phase balanced with the scandium content is reduced by steps, the high yield can be obtained, the total scandium-containing raw materials in the slag are few, the scandium yield is calculated conservatively according to 50%, the total scandium yield of the three-stage reaction is 95.5%, the corresponding raw material cost of each ton of alloy is 21.1 ten thousand yuan (about 32.28 kilograms scandium oxide and 1020 kilograms aluminum), the cost of the reduction smelting process (auxiliary agents, energy sources, manual work, equipment depreciation and the like) is about 3000.4.4-yuan, the economic benefit is reduced by about 6315/t, and the traditional reduction method is not only remarkably reduced by about 3000.
Example 2:
1. adopts the traditional non-vacuum aluminum-magnesium thermal reduction method and ScCl3The Al-Sc alloy is taken as a raw material, molten Al-5% Mg alloy liquid is taken as a reducing agent, a smelting auxiliary agent is added, and the Al-Sc alloy containing 2% of scandium is reduced at high temperature. By usingThe yield of the process is calculated as 90%. Due to ScCl3Usually made of Sc2O3Chlorination to give, theoretically, Sc per kg2O32.2 kg of ScCl can be obtained3Taking into account the yield and the preparation cost, as per the prior Sc2O3Price of 6000 yuan/kg converted ScCl3The price is calculated according to 3000 yuan/kg, and the raw material cost of each ton of alloy is about 24.2 ten thousand yuan (about 74.95 kg ScCl)3And 1000 kilograms of aluminum-magnesium alloy), the cost of the reduction smelting process (auxiliary agent, energy, labor, equipment depreciation and the like) is about 1000 yuan/t, the total production cost of the alloy is about 24.3 ten thousand yuan/t, the product contains about 4 percent of magnesium, is only suitable for aluminum alloy containing magnesium, and is limited by .
2. The non-vacuum aluminum-magnesium thermal reduction method is also adopted, and the reduction process is carried out by adopting the two-stage method of the invention: the initial metal is Al-0.5% Mg alloy, and the initial scandium source is ScCl3. The reaction process is as follows: the liquid Al-0.5% Mg alloy is mixed with the reaction slag generated in the second stage (in the first production, the second stage slag is not generated, and a proper amount of ScCl can be used3And smelting assistant), removing reaction slag after the reaction is finished, and adding a proper amount of ScCl3And carrying out a second-stage (final-stage) reaction with the smelting auxiliary agent, separating reaction slag and reserving the reaction slag as a primary-stage reaction raw material after the reaction is finished, and carrying out ingot casting on the alloy after the alloy is refined to obtain a product.
The method adopts two-stage reaction, the final stage reaction process is similar to that of the traditional non-vacuum aluminothermic reduction method, and the Sc yield is higher than that of the traditional non-vacuum aluminothermic reduction method because a small amount of residual Mg element in the initial stage reaction participates in the reaction, and the Sc yield is calculated according to the same scandium yield of 80%; the Mg content of the reaction participated in the initial stage reaction is lower than that of the traditional non-vacuum aluminum-magnesium thermal reduction method, and the scandium content in the generated alloy is also low, and the scandium yield is calculated according to 80 percent. The overall scandium yield from these two reactions was 96%. The corresponding cost of each ton of alloy raw material is 22.8 ten thousand yuan (about 70.27 kg of ScCl)3And 1010 kg of aluminum-magnesium alloy), the cost (assistant, energy, labor, equipment depreciation and the like) of the reduction smelting process is about 2000 yuan/t, the total production cost of the alloy is about 23 ten thousand yuan/t, and compared with the traditional segment reduction method, the cost is reduced by 53 percent, the scandium yield is improved by 6 percent, and meanwhile, because the alloy product does not contain Mg, the application range of the alloy is more .
Example 3:
1. adopts the traditional non-vacuum aluminum calcium thermal reduction method and Na3AlF6-Sc2O3The molten salt is used as a raw material, the molten Al-0.5% Ca alloy liquid is used as a reducing agent, and the molten Al-0.5% Ca alloy liquid is reduced into an Al-Sc alloy containing 2% scandium at high temperature. Although Ca is more reducing than Mg, it is an impurity in the aluminum alloy and cannot remain, so that the amount of Ca added is limited and the Sc yield is lower than that in the thermal reduction method of aluminum magnesium alloy. Referring to the Sc yield of a non-vacuum aluminothermic reduction method and an aluminum-magnesium alloy thermal reduction method, calculating the Sc yield according to 85 percent, and calculating the Sc yield according to the existing Sc2O3The price is 6000 yuan/kg, the raw material cost of each ton of alloy is about 23.4 ten thousand yuan (about 36.08 kg scandium oxide and 1000 kg aluminum-calcium alloy), the cost of the reduction smelting process (auxiliary agents, energy sources, labor and equipment depreciation and the like) is about 1000 yuan/t, and the total production cost of the alloy is about 23.5 ten thousand yuan/t.
2. The non-vacuum aluminum calcium thermal reduction method is also adopted, the reduction process is carried out in two stages, the initial metal adopts Al-0.5 percent Ca alloy, the initial scandium source adopts Na3AlF6-Sc2O3And (3) melting salt. The reaction process is as follows: the liquid Al-0.5% Ca alloy is mixed with the residual molten salt generated by the second stage reaction in the first stage reaction (in the first production, because the second stage residual molten salt is not generated yet, a proper amount of Na can be used3AlF6-Sc2O3Fused salt substitution), removing residual fused salt after the reaction is finished, and adding a proper amount of Na3AlF6-Sc2O3And carrying out a second-stage (final-stage) reaction on the molten salt, separating residual molten salt after the reaction is finished, reserving the residual molten salt as a primary-stage reaction raw material, and refining the alloy to form a cast ingot.
The two-stage reaction has the advantages that the final stage reaction process is similar to that of the traditional non-vacuum aluminothermic reduction method, the Sc yield is higher than that of the traditional non-vacuum aluminothermic reduction method due to the fact that a small amount of Ca element remained in the initial stage reaction participates in the reaction, the scandium yield is calculated according to the same scandium yield of 80%, the content of reducing agents in the initial stage reaction is the same as that of reducing agents in the traditional non-vacuum aluminothermic reduction method, the scandium content of scandium raw materials is low, the scandium content in the generated alloy is low, the scandium yield is calculated according to the same scandium yield of 85%, the total scandium yield of the two-stage reaction is 97%, the cost of each ton of the corresponding alloy raw materials is 20.7 ten thousand yuan (about 31.61 kg of scandium oxide and 1010 aluminum-magnesium alloy), the cost in the reduction smelting process (auxiliary agents, energy sources, manpower, equipment depreciation and the like) is about 2000 yuan/t, the total production cost of the alloy is about 20.9 ten thousand/t, compared with that of the traditional -stage reduction, the cost is reduced by 11.1%, the yield.
Example 4:
1. adopting the traditional non-vacuum aluminothermic reduction method and ScF3The Al-Sc alloy is taken as a raw material, molten Al liquid is taken as a reducing agent, a smelting auxiliary agent is added, and the Al-Sc alloy is reduced into an Al-Sc alloy containing 2% of scandium at high temperature. The yield by this method was calculated as 80%. Caused by ScF3Usually made of Sc2O3Prepared by theoretically Sc per kilogram2O31.48 kg of ScF can be obtained3Taking into account the yield and the preparation cost, as per the prior Sc2O3Price of 6000 yuan/kg converted ScF3The price is calculated according to 4500 yuan/kg, and the raw material cost of each ton of alloy is about 27.2 ten thousand yuan (about 56.73 kg of ScF3And 1000 kg of aluminum), the cost of the reduction smelting process (auxiliary agent, energy, labor, equipment depreciation and the like) is about 1000 yuan/t, and the total production cost of the alloy is about 27.3 ten thousand yuan/t.
2. The non-vacuum aluminothermic reduction method is also adopted, the reduction process is carried out in a three-stage mode, the initial metal is pure aluminum, and the initial scandium source is ScF3. The reaction process is as follows: the liquid pure aluminum is mixed with the reaction slag generated by the second stage reaction in the first stage reaction (in the first production, because the second stage slag is not generated, a proper amount of ScF can be used3And smelting assistant), removing reaction slag after the reaction is finished, and adding reaction slag generated by the third stage reaction (in the primary production, as the three-stage slag is not generated, a proper amount of ScF can be used3And smelting assistant), separating reaction slag and reserving the reaction slag as a primary reaction raw material after the reaction is finished, and adding a proper amount of ScF into the obtained alloy3The raw materials and the smelting auxiliary agent are subjected to three-stage (final stage) reaction, after the reaction is finished, reaction slag is separated and reserved as a second-stage reaction raw material, and the alloy is refined and cast into a product.
By adopting the three-stage reaction, the final-stage reaction is the same as that of the traditional non-vacuum aluminothermic reduction method, theoretically, the same scandium yield (80%) can be obtained, the reaction conditions can be relaxed, and the scandium yield can be calculated according to 70%; the ScF in the slag phase which is balanced with the ScF and has lower scandium content in the alloy generated by the two-stage reaction3The content is low, the high recovery rate can be obtained, the scandium yield is calculated according to 70 percent, the scandium content in the alloy generated by the initial stage reaction is lower, is controlled below 0.1 percent, and ScF in the slag phase balanced with the scandium content3A further step reduction resulted in a very high yield, but since the total scandium content in the slag was very low, the scandium yield was calculated conservatively to 50%. The total scandium yield in this three-stage reaction was 95.5%. The corresponding cost per ton of alloy feed was 23.2 ten thousand yuan (about 47.77 kg ScF. in each case31020 kg of aluminum), the cost of the reduction smelting process (auxiliary agent, energy, labor, equipment depreciation and the like) is about 3000 yuan/t, the total production cost of the alloy is about 23.5 ten thousand yuan/t, compared with the traditional -stage reduction, the cost is reduced by 13.9 percent, the scandium yield can be improved by more than 15 percent, precious scandium resources are saved, and the social and economic benefits are very obvious.
Claims (4)
1, method for preparing aluminum-scandium alloy by adopting segmented countercurrent reduction method, which is characterized in that the whole reaction process is divided into multiple segments:
initial stage reaction: reacting a pure aluminum or aluminum alloy raw material with a proper amount of scandium-containing raw material to obtain an alloy with low scandium content and a slag phase; the low scandium content alloy is reserved for standby, and the slag phase is discarded;
a second stage of reaction, namely taking the alloy with low scandium content obtained in the first stage of reaction as a main material, adding a proper amount of scandium-containing raw material for reaction, taking the obtained scandium-containing alloy as a main material for the next -stage reaction, and remaining the obtained scandium-containing slag material as the scandium-containing raw material of the first stage of reaction;
and (3) carrying out a final-stage reaction after the plurality of stages of reactions, wherein the final-stage reaction adopts scandium-containing alloy obtained by the upper -stage reaction as a main material to carry out a final reaction with a newly added scandium-containing raw material, the obtained aluminum-scandium alloy is a final product, and the obtained residual scandium-containing slag material is used as the scandium-containing raw material of the upper -stage reaction.
2. The method for preparing aluminum-scandium alloy by using the segmented countercurrent reduction method according to claim 1, wherein: the whole reaction process is at least two stages.
3. The method for preparing aluminum-scandium alloy by using the segmented countercurrent reduction method according to claim 1, wherein: the aluminum alloy raw materials used in the initial stage reaction are aluminum magnesium and aluminum calcium alloy.
4. The method for preparing aluminum-scandium alloy by using the segmented countercurrent reduction method according to claim 1, wherein: the scandium-containing raw material is scandium oxide, chloride or fluoride or a molten salt composed of scandium compound and chloride or/and fluoride.
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| WO2003042418A1 (en) * | 2001-11-12 | 2003-05-22 | Sergei Vladimirovich Makhov | Method for producing an aluminium-scandium foundry alloy and a flux for producing said aluminium-scandium foundry alloy |
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