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A kind of method that utilizes liquid aluminum cathode method to produce aluminum-magnesium alloy

An aluminum-magnesium alloy, liquid aluminum technology, applied in electrodes, electrolysis process, electrolysis components and other directions, can solve the problems of not widely industrial application, uneven composition of aluminum-magnesium alloy, difficult to spread evenly, etc., to achieve good solubility, The effect of easy control and accelerated electrode reaction

Inactive Publication Date: 2016-01-20
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 using a liquid aluminum cathode method, which can produce high-quality aluminum-magnesium alloy with high efficiency. The content of the method includes: taking high-purity magnesium oxide as raw material, dissolving MgO in an electrolyte system composed of Na3PO3-MgF2-NaCl at an electrolysis temperature of 850-900° C. in an electrolytic cell, using high-purity aluminum ingots The molten aluminum is used as a liquid cathode; high-purity graphite is used as the anode, and under the condition of electrolysis with an anode current density of 0.47-0.52A / cm2, a coil magnetic field with a strength of 30-40mT is applied outside the electrolytic cell to make the molten aluminum rotate. Under the action of electromagnetic stirring, magnesium ions are reduced to elemental magnesium on the rotating aluminum liquid cathode and evenly diffused in the aluminum liquid to form an aluminum-magnesium alloy product, and at the same time, CO2 gas is generated at the anode. The alloy formed by the invention has uniform composition and no inclusions. And 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 Patents(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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