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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 high cost, long process and difficult operation, and achieve the effects of improving quality, reducing production cost and improving metal recovery rate.

Inactive Publication Date: 2006-06-21
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The ratio of the control electrolyte is: aluminum fluoride AlF 3 25%, Sodium Fluoride NaF 13%, Barium Chloride BaCl 2 57%, sodium chloride NaCl 5%, 15% scandium chloride ScCl in 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 NaF 15%, Barium Chloride BaCl 2 55%, sodium chloride NaCl 8%, 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 NaF 15%, Barium Chloride BaCl 2 50%, sodium chloride NaCl 8%, 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 Scl.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 production method of a high-purity aluminum-scandium alloy relates to a method for electrolytically producing a high-purity aluminum-scandium alloy by using an existing three-layer liquid aluminum refining electrolytic cell and adding scandium chloride or scandium fluoride into the electrolyte. It is characterized in that scandium chloride or scandium fluoride is added to the electrolyte of three-layer liquid electrolysis to directly electrolyze high-purity aluminum-scandium alloy, and the electrolyte uses fluoride chloride or pure fluoride, and its operation control parameters are: electrolysis temperature: 650 ° C ~ 850°C, working voltage of the electrolytic cell: 4.0v~7.0v, thickness of the electrolyte: 4.0cm~15.0cm; this invention directly adds scandium chloride or scandium fluoride to the three-layer liquid aluminum refining electrolytic cell, so that scandium and aluminum The method of electrolytic separation directly produces high-purity aluminum-scandium alloy, which can greatly improve the quality of aluminum-scandium alloy, and at the same time increase the metal recovery rate and reduce production costs.

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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Patent Type & Authority Patents(China)
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