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Method for aluminum lithium alloy preparation by fused salt electrolysis process

An aluminum-lithium alloy, molten salt electrolysis technology, applied in the field of material science, can solve the problems of increasing the volatilization loss of lithium chloride, shortening the service life of the electrolytic cell, personal and environmental damage, etc., and achieves stable and easy control of the electrolysis process and energy consumption. Reduced, easy to operate and manage effects

Inactive Publication Date: 2009-02-18
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Due to the high vapor pressure of LiCl, when the electrolysis temperature is high, the volatilization loss is very large
At the same time, a vacuum device should be used to suck out the chlorine gas produced by the anode gas during electrolysis, which will further increase the volatilization loss of lithium chloride.
Moreover, chlorine gas is very corrosive to the electrolytic cell at high temperature, and the service life of the electrolytic cell is shortened.
In the event of a chlorine gas leak, serious injury to persons and the environment can result

Method used

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  • Method for aluminum lithium alloy preparation by fused salt electrolysis process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Using an electrolytic cell device such as figure 1 As shown, the aluminum plate cathode 2 is placed in the middle of the two graphite anodes 1, the electrolytic cell body 4 is made of stainless steel, and the corundum insulating plate is laid on the bottom, and the electrolytic cell adopts an external heating method; the anode and the cathode are connected to the power supply through the electrode lead 5, and the electrolysis Mixed salt 3 is placed inside the tank body 4 .

[0031] Among them, the area of ​​the cathode aluminum plate is 200cm 2 , with a thickness of 0.5cm and a mass of 135g.

[0032] Potassium carbonate and lithium carbonate are mixed, and the mixing ratio is that lithium carbonate accounts for 26% of the total mass of the mixed carbonate, and potassium carbonate accounts for 74% of the total mass of the mixed carbonate.

[0033] Put 1000g of mixed carbonate in the electrolytic cell, heat the electrolytic cell containing the mixed carbonate to 550°C, ...

Embodiment 2

[0037] Adopt electrolyzer device with embodiment 1, wherein the cathode aluminum plate area is 200cm 2 , with a thickness of 0.5cm and a mass of 135g.

[0038] Potassium carbonate and lithium carbonate are mixed, and the mixing ratio is that lithium carbonate accounts for 47% of the total mass of the mixed carbonate, and potassium carbonate accounts for 53% of the total mass of the mixed carbonate.

[0039] Put 1000g of mixed carbonate in the electrolytic cell, heat the electrolytic cell containing the mixed carbonate to 490°C, the mixed carbonate will melt, continue heating to 530°C, and then energize the two poles to start electrolysis, the current density during electrolysis 0.1A / cm 2 After the electrolysis is completed, the cathode mixed with lithium metal is taken out, and then put into a new cathode aluminum plate to continue the electrolysis. The use time of each new aluminum plate in the electrolytic cell is 2.1 to 2.5 hours.

[0040] When the concentration of the l...

Embodiment 3

[0043] Adopt electrolyzer device with embodiment 1, wherein the cathode aluminum plate area is 200cm 2 , with a thickness of 0.5cm and a mass of 135g.

[0044] Potassium carbonate and lithium carbonate are mixed, and the mixing ratio is that lithium carbonate accounts for 52% of the total mass of the mixed carbonate, and potassium carbonate accounts for 48% of the total mass of the mixed carbonate.

[0045] Put 1000g of mixed carbonate in the electrolytic cell, heat the electrolytic cell containing the mixed carbonate to 550°C, the mixed carbonate will melt, continue heating to 580°C, and then energize the two poles to start electrolysis, the current density during electrolysis 0.1A / cm 2After the electrolysis is completed, the cathode mixed with lithium metal is taken out, and then put into a new cathode aluminum plate to continue the electrolysis. The use time of each new aluminum plate in the electrolytic cell is 1.4 to 2 hours.

[0046] When the concentration of lithium ...

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Abstract

The invention relates to a method for preparing Al-Li alloy by a molten salt electrolysis method, which is characterized in that mixed carbonate or mixed nitrate containing lithium salt is used as an electrolyte; the mixed salt is arranged in an electrobath, the material of the cathode of which is aluminum, heated to an electrolysis temperature, then electrolyzed; the current density during electrolysis is 0.05 to 0.3A / cm2; after the electrolysis is accomplished, the cathode mixed with the metal Li is taken out; then a new cathode aluminum plate or stick is arranged to be continuously electrolyzed to obtain Al-Li alloy, the Li content of which is between 1 and 15wt percent. In the invention, the molten salt electrolyte and materials of an achloride system is adopted; no chlorine generates during the electrolysis process; the electrolysis temperature does not exceed 600 DEG C; the electrolysis temperature is low; the energy consumption is low; the method for preparing an Al-Li alloy is easily operated and managed.

Description

technical field [0001] The invention belongs to the field of material science, in particular to a method for preparing an aluminum-lithium alloy by molten salt electrolysis Background technique [0002] Due to its low density and high strength, aluminum-lithium alloy has become an ideal structural material in the fields of aerospace and weapon industry. [0003] At present, the method of producing aluminum-lithium alloy is mostly the blending method. In this method, high-purity metal lithium is first electrolyzed, then smelted with aluminum, and cast into an aluminum-lithium alloy. This technological process is long, and lithium recovery rate is low, and because lithium density is little (lithium density is 0.534g / cm3, aluminum density is 2.70g / cm 3 ), low melting point (the melting point of lithium is 180°C, and the melting point of aluminum is 660°C), it is easy to reunite together, and it is difficult to prepare an aluminum-lithium alloy with stable composition. Theref...

Claims

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Application Information

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IPC IPC(8): C25C3/36
Inventor 高炳亮王兆文石忠宁与亚鑫胡宪伟
Owner NORTHEASTERN UNIV
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