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A method for preparing metal aluminum and its alloys by molten salt electrodeposition

An electrodeposition method, a technology of metal aluminum, applied in the field of metallurgy, can solve the problems of high cost and expensive, and achieve the effect of fast electrolysis, high conductivity and low viscosity

Active Publication Date: 2017-10-24
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The ionic liquids such as imidazole chloride / pyridine used in the above low-temperature electrodeposition of aluminum and aluminum alloys are relatively expensive and costly.

Method used

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  • A method for preparing metal aluminum and its alloys by molten salt electrodeposition
  • A method for preparing metal aluminum and its alloys by molten salt electrodeposition
  • A method for preparing metal aluminum and its alloys by molten salt electrodeposition

Examples

Experimental program
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Effect test

Embodiment 1

[0032] The method for preparing aluminum metal by molten salt electrodeposition is carried out according to the following process steps:

[0033] (1) Preparation of molten salt electrolyte: slowly mix vacuum-dried anhydrous urea and anhydrous aluminum chloride at room temperature at a molar ratio of 1:1.2, and control the stirring speed to 400r / min to form a uniform molten salt electrolysis liquid;

[0034](2) Preparation of metal aluminum by electrodeposition: Copper sheet is used as cathode, graphite is used as anode, electrolysis temperature is controlled at 40°C, constant potential method is adopted, and potential is controlled at -0.15V, electrolysis in molten salt electrolyte in step (1) Deposition 1h;

[0035] (3) After the electrolysis, the copper sheet was taken out, washed with acetone and water to obtain metal aluminum deposited on the surface, and the yield was 99.04%.

Embodiment 2

[0037] The method for preparing aluminum metal by molten salt electrodeposition is carried out according to the following process steps:

[0038] (1) Preparation of molten salt electrolyte: slowly mix vacuum-dried anhydrous acetamide and anhydrous aluminum chloride at room temperature at a molar ratio of 1:1.3, and control the stirring speed to 600r / min to form a uniform molten salt electrolyte;

[0039] (2) Preparation of metal aluminum by electrodeposition: use stainless steel sheet as the cathode, graphite as the anode, control the electrolysis temperature to 50°C, adopt the constant potential method, control the potential to -0.20V, and electrolytically electrolyze the molten salt electrolyte in step (1). Deposition 2h;

[0040] (3) After the electrolysis, the stainless steel sheet was taken out, washed with acetone and water to obtain metal aluminum deposited on its surface, and the yield was 99.02%. figure 1 , 2 , 3 show the SEM, EDS and XRD images of the prepared met...

Embodiment 3

[0042] The method for preparing aluminum metal by molten salt electrodeposition is carried out according to the following process steps:

[0043] (1) Preparation of molten salt electrolyte: slowly mix vacuum-dried anhydrous formamide and anhydrous aluminum chloride at room temperature at a molar ratio of 1:1.4, and control the stirring speed to 800r / min to form a uniform molten salt electrolyte;

[0044] (2) Preparation of metal aluminum by electrodeposition: use copper sheet as the cathode, carbon as the anode, control the electrolysis temperature at 60°C, adopt a constant potential method, and control the potential at -0.25V, in the molten salt electrolyte in step (1) Electrodeposition 3h;

[0045] (3) After the electrolysis, the copper sheet was taken out, washed with acetone and water to obtain metal aluminum deposited on its surface, and the yield was 99.10%.

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Abstract

The invention provides a method for preparing metal aluminum and its alloys by molten salt electrodeposition, the process steps are: (1) using vacuum-dried amide compounds to prepare molten salt electrolyte; (2) using copper sheet or stainless steel as The cathode, graphite or carbon material is used as the anode, and the metal aluminum or aluminum alloy is prepared by electrodeposition; (3) After the electrolysis, the copper sheet or stainless steel sheet is taken out to obtain the metal aluminum or aluminum-other metal alloy deposited on the surface. The present invention uses amide aluminum molten salt as the medium for electrodepositing aluminum and its alloys, so that the electrolysis process can be carried out at room temperature, saving energy and at the same time reducing the corrosion of the electrolyte to the equipment; and making the yield of metal aluminum reach 99%; in addition The price of molten salt in the preparation process of the present invention is relatively cheap, and the eutectic temperature is low. Compared with the existing preparation process of aluminum and its alloys, the yield of metal aluminum can be increased and the production cost can be reduced. In addition, the process of the method of the invention is simple and easy to operate.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for preparing metallic aluminum and its alloys by using a molten salt electrodeposition method. Background technique [0002] Metal aluminum and its alloys are widely used in various industries due to their low density, excellent corrosion resistance and electrical conductivity. And metal aluminum has high discharge voltage and theoretical energy density, which can be used as a potential electrode material for lithium-ion batteries. At present, the industrial production of metal aluminum is mainly molten salt electrolysis method, which uses alumina as raw material and dissolves it in Na at 960 °C. 3 AlF 6 Metal aluminum is obtained by electrolysis in molten salt system. Molten salt electrolysis can realize large-scale production of metal aluminum, but this method has a series of problems such as high electrolysis temperature, high energy consumption, an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D3/66
Inventor 王兆文李敏高炳亮刘成员陈文婷石忠宁胡宪伟
Owner NORTHEASTERN UNIV LIAONING
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