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Method for producing aluminum-terbium binary alloy through fused salt electrolysis in fluo-chloride system

A technology of molten salt electrolysis and fluoride chloride is applied in the field of producing aluminum and terbium binary alloys by molten salt electrolysis in a fluoride chloride system, which can solve the problem of high production cost, achieve less equipment corrosion, reduce production cost, and shorten process flow Effect

Inactive Publication Date: 2012-07-04
HARBIN ENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method is easy to operate, and does not need to change the electrolysis process of the original aluminum factory. It only needs to add an appropriate amount of rare earth raw materials to produce aluminum rare earth alloys. However, the raw material used in this method is metal aluminum, and the production cost is relatively high.

Method used

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  • Method for producing aluminum-terbium binary alloy through fused salt electrolysis in fluo-chloride system
  • Method for producing aluminum-terbium binary alloy through fused salt electrolysis in fluo-chloride system

Examples

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Embodiment 1

[0014] Embodiment 1: In the electrolytic cell, the inert metal molybdenum is used as the negative electrode and placed in the lower part of the electrolytic cell, and the graphite is the anode. After adding the dried and dehydrated AlF 3 , NaCl, and KCl are respectively 11%, 39%, and 50% by mass, and then press AlF 3 Add terbium oxide to 10% of the mass, 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 cell voltage is 4.2-4.6V, after 3 hours of electrolysis, aluminum-terbium binary alloy is deposited near the cathode in the electrolytic cell, the contents of Al and Tb in the alloy are 66% and 34% respectively, and the current efficiency is 64.5% , The rare earth direct recovery rate is 46.2%.

Embodiment 2

[0015] Example 2: In the electrolytic cell, the inert metal molybdenum is used as the cathode and placed in the lower part of the electrolytic cell, and the graphite is the anode, and the dried and dehydrated AlF is added 3 , NaCl, and KCl are respectively 11%, 39%, and 50% by mass, and then press AlF 3 Add terbium oxide to 10% of the mass, control the electrolysis temperature to 800°C, and the cathode current density to 5.19A / cm 2 , the anode current density is 0.64A / cm 2 , the cell voltage is 4.5-4.8V, after 3 hours of electrolysis, an aluminum-terbium binary alloy is deposited near the cathode in the electrolytic cell, the contents of Al and Tb in the alloy are 61.4% and 38.6% respectively, and the current efficiency is 67.8% , The rare earth direct recovery rate is 58.3%.

Embodiment 3

[0016] Example 3: In the electrolytic cell, the inert metal molybdenum is used as the cathode and placed in the lower part of the electrolytic cell, and the graphite is the anode, and the dried and dehydrated AlF is added 3 , NaCl, and KCl are respectively 11%, 39%, and 50% by mass, and then press AlF 3 Add terbium oxide to 10% of the mass, control the electrolysis temperature to 800°C, and the cathode current density to 6.92A / cm 2 , the anode current density is 0.85A / cm 2 , the cell voltage is 4.3-4.7V, after 4 hours of electrolysis, an aluminum-terbium binary alloy is deposited near the cathode in the electrolytic cell. The contents of Al and Tb in the alloy are 55.1% and 44.9% respectively, and the current efficiency is 38%. , The rare earth direct recovery rate is 73.2%.

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Abstract

The invention provides a method for producing an aluminum-terbium binary alloy through fused salt electrolysis in a fluo-chloride system. In an electrolytic cell, inert metal molybdenum is taken as a cathode, graphite is taken as an anode, 11 to 16 mass percent of AlF3, 37 to 39 mass percent of NaCl and 47 to 50 mass percent of KCl, which are dehydrated and dried, are added, terbium oxide in an amount which is 3.3 to 10 mass percent of AlF3 is added, the temperature is controlled to be between 700 and 800DEG C, after a material is fused, direct current is switched on for electrolysis, the cathode-current density, the anode-current density and cell voltage are controlled to be 5.19-8.65A / cm<2>, 0.64-1.06A / cm<2> and 3.9-5.1V respectively, and the aluminum-terbium alloy is deposited near the cathode of the electrolytic cell after 2-4 hours. A eutectoid theory is adopted, the aluminum-terbium binary alloy is directly electrolyzed from a metal compound by one step, and the method has the advantages of energy saving, simple operation, single process flow, low production cost, suitability for industrial production and the like.

Description

technical field [0001] The invention relates to a production method of a rare earth aluminum alloy. Specifically, it is a method for producing and preparing aluminum-terbium binary alloy through direct current electrolysis in a fluoride chloride molten salt system. Background technique [0002] Metal aluminum has a silver-white metallic luster, is a good conductor of heat and electricity, and has certain mechanical strength, good ductility, and is easy to be made into various component materials. However, aluminum produced by traditional industries will inevitably contain a small amount of impurities such as iron and silicon, and some other impurities will be introduced during further processing and smelting, so impurities need to be removed. At the same time, pure aluminum cannot meet the needs of some high-end industries in terms of some special properties, so it still needs to be modified. [0003] Rare earth metals are extremely chemically active and can react with alm...

Claims

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Application Information

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IPC IPC(8): C25C3/36
Inventor 张密林韩伟姜涛刘垚臣姜海玲盛庆楠李炜
Owner HARBIN ENG UNIV