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A kind of molten salt electrolysis prepares the method for aluminum magnesium neodymium alloy

A molten salt electrolysis, aluminum-magnesium-neodymium technology, applied in the field of preparation of aluminum-magnesium rare earth alloys, can solve the problems of high cost and short process, and achieve the goals of improving recovery rate, increasing concentration, improving current efficiency and direct rare earth recovery rate Effect

Inactive Publication Date: 2015-09-30
HARBIN ENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The traditional production of aluminum-magnesium alloys usually adopts the miscibility method, that is, the elemental aluminum and elemental magnesium are melted and then miscible. This method has simple production equipment and a short process, but the cost is relatively high

Method used

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  • A kind of molten salt electrolysis prepares the method for aluminum magnesium neodymium alloy

Examples

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Effect test

Embodiment 1

[0012] Example 1: In the electrolytic cell, metal molybdenum (Mo) is used as the inert cathode and placed at the bottom of the electrolytic cell, graphite is used as the anode, and dried and dehydrated AlF is added to the corundum crucible 3 , MgCl 2 , NaCl and KCl, the mass percentages of each component are 8.6%, 4.3%, 38.7%, 48.4% respectively, and then press AlF 3 2.5% of the mass added neodymium oxide (Nd 2 o 3 ), mix evenly, control the electrolysis temperature to 700°C, and the cathode current density to 6.92A / cm 2 , the anode current density is 0.85A / cm 2 , the voltage of the electrolytic cell is 4.8~4.9V. After 3 hours of electrolysis, Al-Mg-Nd ternary alloy is precipitated near the cathode of the electrolytic cell. The contents of Al, Mg and Nd in the alloy are 64.5%, 26.1%, 9.4% respectively. %, the current efficiency is 53.6%, and the direct recovery rate of rare earth is 68.8%.

Embodiment 2

[0013] Example 2: In the electrolytic cell, metal molybdenum (Mo) is used as the inert cathode and placed at the bottom of the electrolytic cell, graphite (C) is used as the anode, and dried and dehydrated AlF is added to the corundum crucible 3 , MgCl 2 , NaCl and KCl, the mass percentages of each component are 9.9%, 1.1%, 39.5%, 49.5%, and then press AlF 3 2.2% of the mass is added with neodymium oxide (Nd 2 o 3 ), mix evenly, control the electrolysis temperature to 700°C, and the cathode current density to 5.19A / cm 2 , the anode current density is 0.64A / cm 2 , the voltage of the electrolytic cell is 5.0~5.1V. After 2 hours of electrolysis, Al-Mg-Nd ternary alloy is precipitated near the cathode of the electrolytic cell. The contents of Al, Mg and Nd in the alloy are 89.4%, 3.3%, and 7.3% respectively , the current efficiency is 81.5%, and the direct recovery rate of rare earth is 37.7%.

Embodiment 3

[0014] Example 3: In the electrolytic cell, metal molybdenum (Mo) is used as the inert cathode and placed at the bottom of the electrolytic cell, graphite (C) is used as the anode, and dried and dehydrated AlF is added to the corundum crucible 3 , MgCl 2 , NaCl and KCl, the mass percentages of each component are 9.8%, 2.2%, 39.1%, 48.9% respectively, and then press AlF 3 2.2% of the mass is added with neodymium oxide (Nd 2 o 3 ), mix evenly, control the electrolysis temperature to 700°C, and the cathode current density to 5.19A / cm 2 , the anode current density is 0.64A / cm 2 , the voltage of the electrolytic cell is 5.0~5.1V, after 3 hours of electrolysis, the Al-Mg-Nd ternary alloy is precipitated near the cathode in the electrolytic cell, and the contents of Al, Mg and Nd in the alloy are 86.3%, 1.1%, respectively. 12.6%, the current efficiency is 75.6%, and the direct recovery rate of rare earth is 84.7%.

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Abstract

The invention provides a method for preparing an aluminium-magnesium-neodymium alloy by molten salt electrolysis, comprising the following steps of: placing molybdenum serving as a negative electrode at the bottom of an electrolytic cell; based on graphite as a positive electrode, adding the following components by weight percent: 8.6-9.4% of AlF3, 4.3-6.3% of MgCl2, 37.5-38.7% of NaCl and 46.9-48.4% of KCl; adding neodymium oxide the mass of which is 2.2-5.5% of the mass of AlF3; controlling a temperature to be 650-700 DEG C, after fusion, controlling the current densities of the negative electrode and the positive electrode to be 5.19-6.92 A / cm<2> and 0.64-0.85 / cm<2> respectively, and controlling the voltage of the cell to be 4.8-5.1 V; electrolyzing for 2-3 hours, replacing the negative electrode once every electrolyzing for 1 hour, and soaking the replaced negative electrode in 5% diluted hydrochloric acid for 30 minutes; separating out a liquid-state Al-Mg-Nd alloy in the vicinity of the negative electrode of the electrolytic cell; and cooling to obtain a solid-state Al-Mg-Nd three-component alloy. Via the method provided by the invention, the passivation of the negative electrode can be effectively avoided, and current efficiency and rare-earth direct recovery rate can be effectively increased.

Description

technical field [0001] The invention relates to a preparation method of an aluminum-magnesium rare-earth alloy. Background technique [0002] Aluminum-magnesium alloy has the characteristics of low density, high tensile strength, strong ductility, good plasticity, easy processing and forming, etc., and is corrosion-resistant and easy to weld. It is often used in the automobile, aircraft and shipbuilding industries. For example: automotive doors, moulds, engine parts, seals, armor plates, pressure vessels, ship materials, etc. At the same time, it has the advantages of good heat dissipation and easy coloring, which can meet the requirements of high integration, lightness, miniaturization, good heat dissipation and electromagnetic shielding of new electronic products, and is easy to color. It can be used in high-end ultra-thin or small Size notebook case. [0003] The traditional production of aluminum-magnesium alloy usually adopts the miscible method, that is, the elementa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25C3/36
Inventor 李梅张密林刘垚臣韩伟
Owner HARBIN ENG UNIV
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