Production method of high purity aluminium scandium alloy

An aluminum-scandium and alloy technology is applied in the production field of high-purity aluminum-scandium alloy, which can solve the problems of long process, difficult operation and high cost, and achieve the effects of reducing production cost, improving metal recovery rate and improving quality.

Active Publication Date: 2004-07-21
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] The production method of aluminum-scandium alloy is now mostly used by fusion method, which is to melt high-purity metal scandium and aluminum 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, and the metal yield is low. , expensive
In addition, there is a 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 yield is low, and the cost is high.
Existing aluminum-scandium alloys are mostly made of industrial primary aluminum, which contains high impurities such as silicon, iron, potassium, and sodium, and it is difficult to meet the composition requirements of the aerospace industry for alloys.

Method used

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Effect test

Embodiment 1

[0020] The ratio of the control electrolyte is: aluminum fluoride AlF 3 25%, sodium fluoride NaF13%, barium chloride BaCl 2 57%, sodium chloride NaCl5%, add 15% scandium chloride ScCl in the electrolyte 3 . Its operating control parameters are: electrolysis temperature: 720°C, electrolytic cell working voltage: 4.5v, electrolyte thickness: 7.0cm. The chemical composition requirements of scandium chloride added to the electrolyte during electrolysis: scandium chloride ScCl 3 : >98.5%, loss on ignition <1%, sum of oxides <0.2%, sum of other impurities <0.3%. The weight percent chemical composition of the high-purity aluminum-scandium alloy produced by the method of the present invention is: scandium Sc 2.0%, the rest is aluminum Al and unavoidable impurities, wherein iron Fe<0.01%, silicon Si<0.01%, other impurities Sum < 0.02%.

Embodiment 2

[0022] The ratio of the control electrolyte is: aluminum fluoride AlF 3 22%, sodium fluoride NaF15%, barium chloride BaCl 2 55%, sodium chloride NaCl8%, add 1% scandium chloride ScCl in the electrolyte 3 . Its operating control parameters are: electrolysis temperature: 700°C, electrolytic cell working voltage: 5.0v, electrolyte thickness: 6.0cm. The chemical composition requirements of scandium chloride added to the electrolyte during electrolysis: scandium chloride ScCl 3 : >98.5%, loss on ignition <1%, sum of oxides <0.2%, sum of other impurities <0.3%. The weight percent chemical composition of the high-purity aluminum-scandium alloy produced by the method of the present invention is: scandium Sc 0.1%, the rest is aluminum Al and unavoidable impurities, wherein iron Fe<0.01%, silicon Si<0.01%, other impurities Sum < 0.02%.

Embodiment 3

[0024] The ratio of the control electrolyte is: aluminum fluoride AlF 3 27%, sodium fluoride NaF15%, barium chloride BaCl 2 50%, sodium chloride NaCl8%, add 10% scandium chloride ScCl in the electrolyte 3 . Its operating control parameters are: electrolysis temperature: 750°C, electrolytic cell working voltage: 6.0v, electrolyte thickness: 13cm. The chemical composition requirements of scandium chloride added to the electrolyte during electrolysis: scandium chloride ScCl 3 : >98.5%, loss on ignition <1%, sum of oxides <0.2%, sum of other impurities <0.3%. The weight percent chemical composition of the high-purity aluminum-scandium alloy produced by the method of the present invention is: scandium Sc 1.0%, the rest is aluminum Al and unavoidable impurities, wherein iron Fe<0.01%, silicon Si<0.01%, other impurities Sum < 0.02%.

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Abstract

A technology for preparing high-purity Al-Sc alloy by use of three-layer molten aluminium refining electrolyzer features that the scandium chloride (or fluoride) is added to electrolyte (fluorochloride or fluoride), and then directly electrolyzed at 650-850 deg.C and under 4-7 V of working voltage. Its advantages are high quality and low cost.

Description

technical field [0001] A production method of high-purity aluminum-scandium alloy. The invention relates to a method for electrolytically producing high-purity aluminum-scandium alloy by using the existing three-layer liquid aluminum refining electrolytic cell, adding scandium chloride or scandium fluoride into the electrolyte. Background technique [0002] The production method of aluminum-scandium alloy is now mostly used by fusion method, which is to melt high-purity metal scandium and aluminum 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, and the metal yield is low. , expensive. In addition, there is a 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 yield is low, and the cost is high. Exis...

Claims

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Application Information

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IPC IPC(8): C25C3/36
Inventor 杨昇顾松青刘凤琴李强罗丽芬赵淋徐建华
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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