Method for preparing Al-Li alloy through molten salt electrolytic method

A technology of aluminum-lithium alloy and molten salt electrolysis, which is applied in the field of preparation of aluminum-lithium alloy by molten salt electrolysis, can solve the problems of increasing the cost of aluminum-lithium alloy, and achieve the effects of stable electrolysis process, simplified preparation process and high solubility

Inactive Publication Date: 2010-02-24
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is difficult to produce aluminum-lithium alloys with high purity requirements by blending such electrolytic lithium products with refined aluminum, and further purification of metal lithium is required, which increases the cost of producing aluminum-lithium alloys

Method used

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  • Method for preparing Al-Li alloy through molten salt electrolytic method
  • Method for preparing Al-Li alloy through molten salt electrolytic method
  • Method for preparing Al-Li alloy through molten salt electrolytic method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The structure of the electrolytic cell used is as follows figure 1 As shown, the plate-shaped cathode 2 is placed in the middle of two graphite anodes 1, the electrolytic cell shell 4 is made of stainless steel, and the corundum insulating plate 6 is laid on the bottom, the lower end of the graphite anode 1 is in contact with the corundum insulating plate 6, and the electrolytic cell adopts an external Heating mode; the anode and the cathode are connected to the power supply through the electrode lead 5. The cathode 2 of the electrolytic cell is made of aluminum.

[0031] Potassium fluoride and lithium fluoride are uniformly mixed to obtain a mixed material, and the weight content of lithium fluoride in the mixed material is 33%.

[0032] Put the mixed material in the electrolytic tank, heat the electrolytic tank until the mixed material melts into a liquid state, the temperature is 550±5°C, then raise the temperature of the mixed material to 580±5°C, add lithium oxide...

Embodiment 2

[0037] The electrolytic cell used is a multi-chamber cell with a structure such as figure 2 As shown, the material of the anode is graphite. The two poles of the electrolytic cell are composed of 12 graphite anodes and 11 plate-shaped cathodes. Each cathode is placed in the middle of two adjacent anodes. The material of the electrolytic cell shell is stainless steel. The corundum insulating board is laid on the wall, the anode is plate-shaped, and is evenly distributed in the electrolytic cell, and the lower end of the anode is in contact with the corundum insulating board; the heating of the electrolytic cell adopts an external heating method, and the distance between two adjacent anodes is equal.

[0038] Potassium fluoride and lithium fluoride are evenly mixed to obtain a mixed material, and the weight content of lithium fluoride in the mixed material is 22%.

[0039] Put the mixed material in the electrolytic tank, heat the electrolytic tank until the mixed material melts...

Embodiment 3

[0044] The electrolyzer structure that adopts is with embodiment 1.

[0045] Potassium fluoride and lithium fluoride are uniformly mixed to obtain a mixed material, and the weight content of lithium fluoride in the mixed material is 52%.

[0046] Put the mixed material in the electrolytic tank, heat the electrolytic tank until the mixed material melts into a liquid state, the temperature is 550±5°C, then raise the temperature of the mixed material to 580±5°C, add lithium oxide into the electrolytic tank and mix evenly to obtain A liquid mixed electrolyte, the weight percentage of lithium oxide in the mixed electrolyte is 10%; wherein the area of ​​the cathode aluminum plate is 200cm 2 , a thickness of 5mm, a mass of 135g, and a total weight of the mixed electrolyte of 1000g.

[0047] Apply electricity to the electrolytic cell for electrolysis, the current density is 0.07A / cm 2 , the electrolysis time is 1.0~1.2h, after the electrolysis is over, replace the cathode and contin...

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Abstract

A method for preparing Al-Li alloy through a molten salt electrolytic method includes following steps: (1) uniformly mixing potassium fluoride, calcium fluoride, barium fluoride or lithium chloride and lithium fluoride to obtain the mixed material; (2) putting the mixed material in an electrolytic tank and heating the electrolytic tank to a temperature higher than the mixed electrolyte melting point of 10-100 DEG C; adding lithium oxide in the electrolytic tank and uniformly mixing to obtain the liquid mixed electrolyte; electrifying the electrolytic tank for electrolysis with the current density of 0.05-0.4A / cm[2] and the electrolysis time of 0.6-2.5h. The method adopts the lithium oxide as the electrolysis material and the electrolysis process does not generate the chlorine and other harmful gases.

Description

technical field [0001] The invention relates to a method for preparing an alloy, in particular to a method for preparing an aluminum-lithium alloy by a molten salt electrolysis method. 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 / cm 3 , the 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 c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C3/36
Inventor 高炳亮王兆文石忠宁于亚鑫胡宪伟
Owner NORTHEASTERN UNIV LIAONING
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