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Method for preparing aluminum-scandium-transition metal alloy through consumable cathode molten salt electrolysis

A technology for consumable cathodes and transition metals, applied in the electrolysis process, electrolysis components, electrodes, etc., can solve the problems of unavailability, low melting point of aluminum, and preparation of aluminum-scandium alloys, and achieves easy regulation, stable metal alloy composition, and alloy composition. stable effect

Pending Publication Date: 2022-06-28
JIANGXI UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the high melting point of scandium and the low melting point of aluminum, it is impossible to prepare aluminum-scandium alloys by using the up-insertion cathode molten salt electrolysis widely used in the rare earth industry.

Method used

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  • Method for preparing aluminum-scandium-transition metal alloy through consumable cathode molten salt electrolysis
  • Method for preparing aluminum-scandium-transition metal alloy through consumable cathode molten salt electrolysis
  • Method for preparing aluminum-scandium-transition metal alloy through consumable cathode molten salt electrolysis

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Experimental program
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Embodiment 1

[0032] The specific preparation process of the present embodiment is as follows:

[0033] (1) Preparation of aluminum-nickel alloy consumable cathode. Aluminum and nickel are made into alloy rods, and the content of nickel in the alloy can be 50% to 90% by weight. In this embodiment, an AlNi alloy with a nickel content of 70% is selected, and the melting point of the alloy is 1638 ° C (such as figure 1 shown), the AlNi alloy is made into a cylindrical alloy rod;

[0034] (2) Preparation of aluminum-nickel-scandium alloy by molten salt electrolysis. The AlNi alloy rod is used as a plug-in cathode to prepare metal scandium by molten salt electrolysis with scandium oxide as raw material to form an aluminum-nickel-scandium alloy. The mass ratio of the molten salt system is LiF 20%, and the corresponding scandium fluoride accounts for 80%. ℃, cathode current density 5A / cm 2 ; The formed liquid ternary aluminum-nickel-scandium alloy is dropped from the cathode surface to the tung...

Embodiment 2

[0036] The specific preparation process of the present embodiment is as follows:

[0037] (1) Preparation of aluminum-iron alloy consumable cathode. Aluminum and iron are made into alloy rods, and the content of iron in the alloy can be 60% to 90% by weight. In this embodiment, an AlFe alloy with a nickel content of 72% is selected, and the alloy melting point is 1310 ° C (such as figure 2 shown), the AlFe alloy was made into a quadrangular prism-shaped alloy rod;

[0038] (2) Preparation of aluminum-iron-scandium alloy by molten salt electrolysis. The AlFe alloy rod is used as a plug-in cathode to prepare metal scandium by molten salt electrolysis with scandium oxide as raw material to form an aluminum-iron-scandium alloy. The molten salt system is LiF 75% by mass, cryolite 10%, CaF 2 5%, the corresponding scandium fluoride accounts for 10%, the electrolysis temperature is 1000℃, and the cathode current density is 7A / cm 2 ; The formed liquid ternary aluminum-iron-scandium...

Embodiment 3

[0040] The specific preparation process of the present embodiment is as follows:

[0041] (1) Preparation of aluminum-titanium alloy consumable cathode. Aluminum and titanium are made into alloy rods, and the content of titanium in the alloy can be 30% to 99% by weight. In this embodiment, TiAl with a titanium content of 38% is selected 3 Alloy, the melting point of the alloy is 1392 ° C (such as image 3 shown), the TiAl 3 The alloy is made into a hexagonal alloy rod;

[0042] (2) Preparation of aluminum-titanium-scandium alloy by molten salt electrolysis. TiAl 3 The alloy rod is used as an upper plug-in cathode to prepare metal scandium by molten salt electrolysis with scandium oxide as raw material to form an aluminum-titanium-scandium alloy. The mass ratio of the molten salt system is LiF15%, KF2%, NaF3%, CaF 2 10%, AlF 3 5%, BaF 2 Scandium fluoride corresponding to 5% accounts for 60%, the electrolysis temperature is 900 ℃, and the cathode current density is 10A / cm...

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Abstract

The invention relates to a method for preparing an aluminum-scandium-transition metal alloy through consumable cathode molten salt electrolysis. The method comprises the following steps: (1) preparing an aluminum alloy consumable cathode; aluminum and high-melting-point metal are made into an alloy bar, and a high-melting-point aluminum alloy consumable cathode is manufactured; and (2) preparing the aluminum-scandium multi-component alloy through molten salt electrolysis. A high-temperature aluminum-transition metal alloy bar is used as an up-inserted cathode for preparing metal scandium by molten salt electrolysis with scandium oxide as a raw material, a multi-element aluminum-scandium-transition metal alloy is formed, the melting point of the formed multi-element alloy is lower than the electrolysis temperature, and the multi-element alloy drops into a tungsten and molybdenum crucible at the bottom of an electrolytic cell from the surface of the cathode. According to the method, an existing rare earth electrolytic cell can be directly used, the aluminum-scandium-transition metal alloy is prepared through an up-insertion type consumable cathode fused salt electrolysis method under the condition that the temperature is higher than the aluminum melting point temperature, and alloy components are stable and easy to regulate and control.

Description

technical field [0001] The invention relates to the technical field of aluminum-scandium alloy preparation, in particular to a method for preparing aluminum-scandium-transition metal alloy by consumable cathode molten salt electrolysis. Background technique [0002] Aluminum-scandium alloys have excellent properties and are widely used. At present, the preparation methods of aluminum-scandium alloys include: metal doping method, molten salt electrolysis method and metallothermic reduction method. Molten salt electrolysis is a widely used method for preparing rare earth and rare earth alloys. The cathode part of molten salt electrolysis mainly includes three forms: plug-in inert cathode (solid state), plug-in consumable cathode (solid state) and liquid cathode. The plug-in inert cathode is mainly used for molten salt electrolysis of low-melting-point metals, and tungsten is used as the cathode material; the plug-in consumable cathode is mainly used for the preparation of so...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C3/36C25C7/02
CPCC25C3/36C25C7/025
Inventor 张永健王瑞祥徐志峰王旭傅大学
Owner JIANGXI UNIV OF SCI & TECH
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