Electrolytic method for manufacturing aluminum-manganese alloy in fluoride-chloride molten salt system

A fluoride chloride, magnesium alloy technology, applied in the field of aluminum-magnesium alloy preparation, can solve the problems of difficult recovery, disproportionation reaction and the like

Inactive Publication Date: 2013-02-06
HARBIN ENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

When the concentration of these low-valent chlorides exceeds a certain limit, a disproportionati

Method used

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  • Electrolytic method for manufacturing aluminum-manganese alloy in fluoride-chloride molten salt system

Examples

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Embodiment 1

[0016] Example 1: In the electrolytic cell, the inert metal molybdenum (Mo) is used as the cathode and placed in the lower part of the electrolytic cell, graphite is used as the anode, and the mass ratio of each electrolyte in the system is NaCl:KCl:AlF 3 =39%: 50%: 11%, cover and heat to 680°C, after the electrolyte in the crucible melts, add MgCl 2 Added to molten salt, MgCl 2 The amount added is AlF 3 50% of the mass, through direct current electrolysis, at an electrolysis temperature of 680 ° C, the cathode current density is 6.9A / cm 2 , the anode current density is 0.9A / cm 2 , the cell voltage is 5.2~5.6V, after 2.5 hours of electrolysis, Al-Mg alloy is deposited near the cathode in the electrolytic cell. The contents of Al and Mg in the alloy are 94.9% and 5.1%, respectively, and the current efficiency is 55.9%.

Embodiment 2

[0017] Example 2: MgCl 2 The amount added is AlF 3 40% of the mass was electrolyzed by direct current. At an electrolysis temperature of 680°C, the cathode current density was 6.9A / cm2, the anode current density was 0.9A / cm2, and the cell voltage was 4.8-~5.0V. After 4 hours of electrolysis, the The electrolytic cell deposits Al-Mg alloy near the cathode. The contents of Al and Mg in the alloy are 85.3% and 14.7%, respectively, and the current efficiency is 40.5%.

Embodiment 3

[0018] Example 3: MgCl 2 The amount added is AlF 3 40% of the mass, through direct current electrolysis, electrolysis temperature 680 ℃, the cathode current density is 6.9A / cm 2 , the anode current density is 0.9A / cm 2 , the cell voltage is 4.7~4.9V, after 3 hours of electrolysis, Al-Mg alloy is deposited near the cathode in the electrolytic cell. The contents of Al and Mg in the alloy are 84.8% and 15.2%, respectively, and the current efficiency is 49.2%.

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Abstract

The invention aims to provide an electrolytic method for manufacturing aluminum-manganese alloy in a fluoride-chloride molten salt system. The electrolytic method includes that in an electrolytic bath, inert metal molybdenum is used as a cathode and is placed at a lower portion of the electrolytic bath, and graphite is used as an anode; an electrolyte comprises 39% of NaCl, 50% of KCl and 11% of AlF3, is prepared according to the mass ratio and is heated, so that the temperature of the electrolyte ranges from 680 DEG C to 730 DEG C; MgCl2 is added into the electrolyte after the electrolyte is melted, and the quantity of the added MgCl2 accounts for 40-75% of the mass of the AlF3; direct-current power is switched on for electrolysis, the electrolytic temperature ranges from 680 DEG C to 730 DEG C, the current density of the cathode ranges from 5.2A/cm<2> to 8.7A/cm<2>, the current density of the anode ranges from 0.6A/cm<2> to 1.1A/cm<2>, and the voltage of the bath ranges from 4.7V to 6.1V; and liquid Al-Mg alloy is deposited at a position close to the cathode of the electrolytic bath after electrolysis is carried out for 1.5 to 4 hours, and is cooled down to obtain the solid Al-Mg alloy. The electrolytic method has the advantages that a process of a production technology can be greatly shortened, the technology is simple, energy is saved, and the purity of the product is high.

Description

technical field [0001] The invention relates to a method for preparing an aluminum-magnesium alloy. Background technique [0002] As a new type of aluminum alloy material, aluminum-magnesium alloy has become the most potential new metal structural material in the fields of navigation, aviation and transportation due to its low density, high strength, good heat dissipation and good corrosion resistance. [0003] At present, the main methods of industrial production of aluminum-magnesium alloys include the method of doping and molten salt electrolysis. For the blending method, for example, the patent application number is 201010172444.5, and the patent document titled "a kind of aluminum-magnesium alloy" discloses a kind of aluminum-magnesium alloy used for casting castings whose elongation is required to be greater than 10%. The weight percentage is: Mg: 3.8%-4.5%, Cu: 0.3%-0.4%, Ti: 0.2%-0.23%, Fe: ≤0.1%, Si: ≤0.1%, and the balance is Al. Controlling the amount of Ti added...

Claims

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Application Information

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IPC IPC(8): C25C3/36
Inventor 韩伟张密林盛庆南姜海玲
Owner HARBIN ENG UNIV
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