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Method for producing aluminum-magnesium alloy by utilizing liquid aluminum cathode method

A technology of aluminum-magnesium alloy and liquid aluminum, which is applied in the direction of electrodes, electrolysis process, electrolysis components, etc., can solve the problems that have not been widely used in industry, the composition of aluminum-magnesium alloy is uneven, and the anode effect occurs, so as to achieve good solubility, Easy-to-control, dissolution-promoting effect

Inactive Publication Date: 2014-03-19
UNIV OF SCI & TECH LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although oxide electrolysis has made great breakthroughs, it has not been widely used in industry. The main problems are: (1) The solubility of oxides in molten salt is low, anodic effects often occur, and the current efficiency is very low.
(2) When the concentration of magnesium in the molten aluminum reaches a certain level, the diffusion of magnesium is affected by the resistance of the liquid phase, and it is difficult to evenly diffuse into the molten aluminum, resulting in uneven composition of the aluminum-magnesium alloy

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] With 60wt%Na 3 PO 3 -40wt%MgF 2 It is an electrolyte system, using high-purity magnesium oxide as the raw material for electrolysis, using molten aluminum after melting high-purity aluminum ingots as the cathode, and high-purity graphite as the anode. The electrolysis method is sinking, and the electrolysis temperature is 880°C. The distance between them is 20cm, and at the same time of DC electrolysis, a coil magnetic field with a magnetic field strength of 40mT is applied to the electrolyzer, and 1.5wt% MgO is added every 20min, and the anode current density used is 0.47A / cm 2 , after 5 hours of electrolysis, an aluminum-magnesium alloy product with a metal magnesium content of 15wt% is obtained, and the anode gas generated during the electrolysis process is CO 2 and CO.

Embodiment 2

[0022] With 60wt%Na 3 PO 3 -30wt%MgF 2 -10wt%NaCl is the electrolyte system, high-purity magnesium oxide is used as the raw material for electrolysis, the molten aluminum after melting high-purity aluminum ingots is used as the cathode, and high-purity graphite is used as the anode. The distance between the cathode and the cathode is 20cm. At the same time of DC electrolysis, a coil magnetic field with a magnetic field strength of 30mT is applied to the electrolytic cell, and 1.5wt% MgO is added every 30min. The anode current density used is 0.51A / cm 2 , after electrolysis for 5 hours, an aluminum-magnesium alloy product with a metal magnesium content of 20wt% was obtained, and the anode gas produced during the electrolysis process was CO 2 and CO.

Embodiment 3

[0024] With 70wt%Na 3 PO 3 -20wt%MgF 2 -10wt%NaCl is the electrolyte system, high-purity magnesium oxide is used as the raw material for electrolysis, the molten aluminum after melting high-purity aluminum ingots is used as the cathode, and high-purity graphite is used as the anode. The distance between the cathode and the cathode is 20cm. At the same time of direct current electrolysis, a coil magnetic field with a magnetic field strength of 30mT is applied to the electrolytic cell, and 1.5wt% MgO is added every 30min. The anode current density used is 0.52A / cm 2 , after 4 hours of electrolysis, an aluminum-magnesium alloy product with a metal magnesium content of 10wt% is obtained, and the anode gas generated during the electrolysis process is CO 2 and CO.

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Abstract

The invention discloses a method for producing an aluminum-magnesium alloy by utilizing a liquid aluminum cathode method. The method is used for high-efficiently producing the high-quality aluminum-magnesium alloy. The method comprises the following steps of dissolving the high-purity magnesium oxide (MgO) in an electrolyte system consisting of Na3PO3-MgF2-NaCl in an electrolytic cell under the electrolytic temperature of 850DEG C to 900DEG C, wherein the aluminum liquid which is formed by melting a high-purity aluminum ingot is used as a liquid cathode; and applying a coil magnetic field with the intensity of 30mT to 40mT outside the electrolytic cell so as to enable the aluminum liquid to rotate under the electrolytic conditions that the anode current density is 0.47 to 0.52A / cm<2> and the high-purity graphite is adopted as an anode, reducing the magnesium ions on the rotating aluminum liquid cathode into elemental magnesium under the electromagnetic stirring effect to be uniformly dispersed into the aluminum liquid so as to form the aluminum-magnesium alloy product, and producing CO2 gas on the anode. The alloy prepared through the method is uniform in components and contains no impurity. The production process is continuous and easy to control.

Description

technical field [0001] The invention relates to a method for producing aluminum-magnesium alloys, in particular to a method for producing aluminum-magnesium alloys using a liquid aluminum cathode method. Background technique [0002] Magnesium has been paid more and more attention due to its abundant resources, especially the demand for structural lightweight technology and environmental protection issues has stimulated the development of the magnesium industry. The main production methods of metal magnesium are thermal reduction method and electrolysis method. The thermal method is mainly based on Pidgeon method. The outstanding disadvantages of Pidgeon method are high energy consumption, low metal recovery rate, and serious environmental pollution. The electrolysis method has the advantages of advanced technology and low energy consumption, and is a very promising method for smelting magnesium. At present, more than 80% of magnesium metal in developed countries is produce...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C3/04C25C7/02C22C21/06C22C1/02
Inventor 王一雍金辉李继东路金林苏建铭张保国
Owner UNIV OF SCI & TECH LIAONING
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