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Method of producing aluminium scandium alloy by electrolysis

A technology of alloy and aluminum-scandium, applied in the field of electrolytic production of aluminum-scandium alloy, can solve the problems of long process, low metal yield, difficult operation, etc., and achieve the effects of cost reduction, high metal yield and shortened process flow

Inactive Publication Date: 2003-04-16
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, the production method of aluminum-scandium alloy mostly adopts the fusion method, which is to use high-purity metal scandium and aluminum to melt and cooperate under the protection of argon gas. This method is not easy to operate, the burning loss is serious, and the production process of pure metal scandium is complicated. Low metal yield and high cost
In addition, there is the fluoride vacuum aluminothermic reduction method. The scandium fluoride used in this method is obtained by reacting scandium oxide after repeated purification with hydrofluoric acid. Fluoride also seriously affects the properties of the alloy

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Controlling the weight percent composition of the electrolyte molten cryolite system is calcium fluoride CaF 2 : 2%, magnesium fluoride MgF 2 : 4%, aluminum oxide Al 2 o 3 7%, scandium oxide 3%, the balance is cryolite; the electrolysis temperature is 950°C, the working voltage of the electrolytic cell is 4.0V-4.5V; the electrode distance is 4.0cm; the cryolite molecular ratio is 2.4. During electrolysis, the weight percentage of the electrolytic raw materials continuously added is composed of: Scandium oxide Sc 2 o 3 : 0.5%, the others are alumina Al 2 o 3 and unavoidable impurities, of which ignition 2 o 3 2 <0.2%, the sum of other impurities <0.2%;

[0017] The weight percent chemical composition of the produced aluminum-scandium alloy is: scandium 0.5%, the rest is aluminum and unavoidable impurities, iron Fe < 0.15%, silicon Si < 0.12%, and other impurities in small amounts.

Embodiment 2

[0019] Control the weight percent composition of the electrolyte molten cryolite system as alumina Al 2 o 3 1.5%, scandium oxide 10%, and the balance is cryolite; the electrolysis temperature is 980°C, the working voltage of the electrolytic cell is 6.5V; the electrode distance is 6.0cm; the cryolite molecular ratio is 3. During electrolysis, the weight percentage of the electrolytic raw materials continuously added is composed of: Scandium oxide Sc 2 o 3 : 4.5%, the others are alumina Al 2 o 3 and unavoidable impurities, of which ignition 2 o 3 2 <0.2%, the sum of other impurities <0.2%;

[0020] The weight percent chemical composition of the produced aluminum-scandium alloy is: scandium 3%, the rest is aluminum and unavoidable impurities, iron Fe < 0.15%, silicon Si < 0.12%, and other impurities in small amounts.

Embodiment 3

[0022] Control the weight percent composition of the electrolyte molten cryolite system as alumina Al 2 o 3 9%, scandium oxide 0.5%, lithium fluoride 5%, and the balance is cryolite; the electrolysis temperature is 930°C, the working voltage of the electrolytic cell is 3.0V; the electrode distance is 2.5cm; the cryolite molecular ratio is 2.6. During electrolysis, the weight percentage of the electrolytic raw materials continuously added is composed of: Scandium oxide Sc 2 o 3 : 0.1%, others are aluminum oxide Al 2 o 3 and unavoidable impurities, of which ignition 2 o 3 2 <0.2%, the sum of other impurities <0.2%;

[0023] The weight percent chemical composition of the produced aluminum-scandium alloy is: scandium 0.1%, the rest is aluminum and unavoidable impurities, iron Fe < 0.15%, silicon Si < 0.12%, and other impurities in small amounts.

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Abstract

The invention relates to the method for producing the alloy of aluminium and scandium by using oxides of aluminium and scandium as the raw materials. Fused salt electrolysis process is adopted to electrolyze and separate out aluminium and scandium so as to form the alloy. The weight ratio of the electrolyte of fused cryolite is as following: alumina 1%-10%, scandium oxide 0.1%-10%, cryolite as the rest and the unavoidable impurities. The ratio between sodium fluoride and aluminium fluoride is 2-3. The relevant parameters are as following: temperature of electrolysis 900-990 deg.C, operating voltage of the electrobath 3.0V-6.5V and the electrode distance 2.0cm-7.0 cm. The invention possesses the features of no need of high pure metal scandium, shortened technological flow and high metal yield so as to reduce the cost of the alloy greatly.

Description

technical field [0001] The invention discloses a method for producing aluminum-scandium alloy by electrolysis, which relates to a method for directly producing aluminum-scandium alloy by using aluminum and scandium oxides as raw materials, electrolyzing aluminum and scandium simultaneously to form an alloy by electrolytic method. Background technique [0002] At present, the production method of aluminum-scandium alloy mostly adopts the fusion method, which is to use high-purity metal scandium and aluminum to melt and cooperate under the protection of argon gas. This method is not easy to operate, the burning loss is serious, and the production process of pure metal scandium is complicated. The metal yield is low and the cost is expensive. In addition, there is the fluoride vacuum aluminothermic reduction method. The scandium fluoride used in this method is obtained by reacting scandium oxide after repeated purification with hydrofluoric acid. The process is long, the metal ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C3/36
Inventor 杨昇顾松青刘凤琴
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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